OpenFOAM/C3/Introduction-to-SnappyHexMesh/English - Revision history

Nancyvarkey at 10:48, 10 July 2014

2014-07-10T10:48:47Z

Chaitralighodke at 05:52, 8 July 2014

2014-07-08T05:52:42Z

Chaitralighodke at 05:47, 8 July 2014

2014-07-08T05:47:55Z

Chaitralighodke at 05:34, 8 July 2014

2014-07-08T05:34:31Z

Chaitralighodke at 05:28, 8 July 2014

2014-07-08T05:28:50Z

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Nancyvarkey at 17:15, 5 July 2014

2014-07-05T17:15:43Z

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Chaitralighodke: Created page with 'Tutorial: Introduction to snappyHexMesh in OpenFOAM. Script and Narration: Chaitrali Ghodke. Keywords: Import STL file, background hex mesh, snappyHexMeshDict. {| style="…'

2014-07-03T07:53:59Z

Created page with 'Tutorial: Introduction to snappyHexMesh in OpenFOAM. Script and Narration: Chaitrali Ghodke. Keywords: Import STL file, background hex mesh, snappyHexMeshDict. {| style="…'

New page

Tutorial: Introduction to snappyHexMesh in OpenFOAM.

Script and Narration: Chaitrali Ghodke.

Keywords: Import STL file, background hex mesh, snappyHexMeshDict.

{| style="border-spacing:0;"
| style="border-top:0.05pt solid #000000;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| <center>Visual Cue</center>
| style="border:0.05pt solid #000000;padding:0.097cm;"| <center>Narration</center>

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 1
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Hello and welcome to the spoken tutorial on Introduction to '''snappyHexMesh''' in '''OpenFOAM'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 2 : Learning Objectives

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this tutorial, we will learn about

* The parameters in '''snappyHexMesh''' to generate '''Mesh''' in '''OpenFOAM'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 2: Pre-requisite
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| As a pre-requisite, the user requires

* Surface data files in '''STL''' format
* A domain with '''hex mesh'''
* '''snappyHexMeshDict''' located in the '''system''' sub-directory of''' case'''

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 3:

System Requirement
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To record this tutorial, I am using

* '''Ubuntu Linux''' operating system 12.04
* '''OpenFOAM''' version 2.2.1
* '''ParaView''' version 3.12.0

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 4: Methodology for snappyHexMesh

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| There are five steps to create a mesh with the snappyHexMesh utility.

Step 1 : Create a '''base mesh''' by using '''blockMesh''' utility

Step 2 : Refine '''base mesh'''

Step 3 : Remove unused '''cells'''

Step 4 : '''Snap mesh''' to surface

Step 5 : Add layers

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Ctrl+Alt+t simultaneously

Type run '''cd OpenFOAM-2.2.2/tutorials/mesh/snappyHexMesh/flange'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Let us learn, the different parameters in snappyHexMesh to generate mesh in OpenFOAM.

To do this, we will open the '''terminal window '''and enter the path for '''flange '''as shown.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''run'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Type '''run''' and press '''Enter'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''cd tutorials/mesh/snappyHexMesh/flange'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Type '''cd tutorials/mesh/snappyHexMesh/flange '''and press '''Enter'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''ls'''

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''ls''' and press '''Enter.'''

There are two folders '''constant '''and '''system'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''cd system'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Type '''cd space system''' and press '''Enter.'''

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''ls'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Now type '''ls''' and press '''Enter.'''

You can see the '''snappyHexMeshDict '''file.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Type '''gedit snappyHexMeshDict'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| To view the contents of the file type -

'''gedit snappyHexMeshDict '''

and press '''Enter.'''

(Note that H, M and D here are in capital letters.)

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| This will open up the '''snappyHexMeshDict''' file.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Let me drag this to the capture area.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 5 :
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''snappyHexMeshDict''' file contains all the instructions and the entire process revolves around this file.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Activation rows

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| With the first rows of '''snappyHexMeshDict, '''you can activate or skip sections of the process.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Geometry
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In '''geometry''' section, all active regions that take part in snappy process can be defined.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| '''castellatedMeshControls''' section.
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The parameters that govern the process of cell splitting are described in '''castellatedMeshControls''' section.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| '''CastellatedMeshControls'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The parameters that are listed below are well explained in '''snappyHexMeshDict''' file.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| '''nCellsBetweenLevels'''
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nCellsBetweenLevels''' defines number of cells for each refinement level.

The higher it is, the more gradual the '''mesh''' will be.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Explicit feature edge refinement
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the explicit feature edge refinement section, you can set specific refinement level for geometry’s feature edges.

The''' .eMesh''' file can be obtained with the '''surfaceFeatureExtract '''utility.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Surface based refinement

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''surface-based refinement '''section, you can set the refinement levels of all surfaces defined in '''geometry''' file.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Mesh selection
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Mesh selection is a very important parameter.

If the chosen point is inside the surface described in '''geometry''' file, then '''snappyHexMesh''' will create the internal mesh.

Otherwise the external part (inside the blockMesh) is meshed.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The next step involves moving cell vertex points onto the surface geometry.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| SnapControls

Settings for the snapping

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The snapping process is carried out by four parameters:

* nSmoothPatch
* tolerance
* nSolveIter
* nRelaxIter

These parameters control the number of iterations and tolerance between '''mesh''' and '''STL''' surface.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nSmoothPatch
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified sentence is shown in the script.

Original sentence:

'''nSmoothPatch '''option changes how many times the exterior (the boundary wall) should be iterated.'''nSmoothPatch '''option changes how many times the exterior (the boundary wall) should be iterated.

The mesh will become smoother if the number of iterations are more.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| tolerance
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified sentence is shown in the script.

Original sentence:

'''Tolerance''' option changes how long distance the program should look for a point to snap.'''Tolerance''' option changes how long distance the program should look for a point to snap.

The distance will be the number that is in '''tolerance.'''

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nSolveIter
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified Sentence'''nSolveIter '''option changes how many times the snapping part of '''snappyHexMesh '''should be run.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nRelaxIter

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified Sentence'''nRelaxIter''' option changes how many times the mesh should run a relaxing script, that removes bad mesh points.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| addLayerControls

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The process of mesh layer addition involves shrinking the existing mesh from the boundary and inserting layers of cells.

The group of parameters define the dimensions for layers and surface on which they will be attached.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| relativeSizes
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''RelativeSizes '''option (true or false) changes the way to read the parameters.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| layers
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In '''layers''' option, you can define the number of '''layers''' and the patch on which attach the '''layers'''.

It must be an STL patch in '''geomery''' menu, and not a user defined region.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| expansionRatio

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''ExpansionRatio''' parameters set the ratio between two subsequent layers.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| finalLayerThickness

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''FinalLayerThickness''' parameter sets the thickness of the last layer.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| minThickness
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''MinThickness''' parameter sets the minimum allowable thickness of layer.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Advanced settings

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''Advanced settings''' is the second group of parameters.

It contains more specific controls that can help in layer creation.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| featureAngle

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''FeatureAngle''' is the angle above which the surface will not be extruded.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| ==== nRelaxIter ====

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nRelaxIter''' option changes how many times the mesh will run a relaxing script.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| ==== maxFaceThicknessRatio ====

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''MaxFaceThicknessRatio''' option changes the maximum allowable value of aspect ratio.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| meshQualityControls

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| meshQualityControls parameter sets the minimum thresholds to generate mesh in snap and add-layers parts.

In 99% of the cases, it is better to leave the default values.

But sometimes you can deactivate one or more controls to force mesh generation.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| These are the different parameters in '''snappyHexMeshDict'''.

These parameters are important to generate mesh using '''snappyHexMesh''' utility.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| <nowiki><PAUSE></nowiki>

Let me get back to the slides.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"|
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Let us summarize.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 9: Summary

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In this tutorial we learnt :

Different parameteres in '''snappyHexMesh '''to generate mesh in '''OpenFoam'''.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 10: About Spoken tutorials
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Watch the video available at this URL:

http://spoken-tutorial.org/What_is_a_Spoken_Tutorial

It summarizes the Spoken Tutorial project.

If you do not have good bandwidth, you can download and watch it.

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 11:

About Spoken tutorials
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The Spoken Tutorial Project Team

-Conducts workshops using spoken tutorials

-Gives certificates to those who pass an online test

-For more details, please write to

contact@spoken-tutorial.org

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 12:

Acknowledgement

| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Spoken Tutorial is a part of Talk to a Teacher project,

It is supported by the National Mission on Education through ICT, MHRD, Government of India.

More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro

|-
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| About the contributor
| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| This is Chaitrali Ghodke from IIT BOMBAY signing off.

Thanks for joining.

|}

@@ Line 36: / Line 36: @@
 * A domain with '''hex mesh'''
 * '''snappyHexMeshDict''' dictionary located in the '''system''' sub-directory of''' case'''
@@ Line 48: / Line 47: @@
 * '''OpenFOAM''' version 2.2.2
 * '''ParaView''' version 3.12.0
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 5: Methodology for snappyHexMesh
@@ Line 76: / Line 73: @@
 Type '''cd OpenFOAM-2.2.2/tutorials/mesh/snappyHexMesh/flange'''
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| We will open the '''terminal '''and enter the path for '''flange '''as shown.
 |-
@@ Line 126: / Line 126: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Geometry
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''geometry''' section, all active regions that take part in snappy process can be defined.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''geometry''' section, all active regions that take part in '''snappy''' process can be defined.
 |-
@@ Line 145: / Line 145: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Explicit feature edge refinement
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the explicit feature edge refinement section, you can set specific refinement level for geometry’s feature edges.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''Explicit feature edge refinement''' section, you can set specific refinement level for geometry’s feature edges.
@@ Line 179: / Line 179: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The snapping process is carried out by four parameters:
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The '''snapping''' process is carried out by four parameters:
-* nSmoothPatch
+* '''nSmoothPatch'''
-* tolerance
+* '''tolerance'''
-* nSolveIter
+* '''nSolveIter'''
-* nRelaxIter
+* '''nRelaxIter'''
 These parameters control the number of iterations and tolerance between '''mesh''' and '''STL''' surface.
@@ Line 194: / Line 194: @@
-The mesh will become smoother if the number of iterations are more.
+The '''mesh''' will become smoother if the number of iterations are more.
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| tolerance
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
-'''Tolerance''' option specifies the distance the program should look, for a point to snap.
+'''Tolerance''' option specifies the distance the program should look, for a point to '''snap'''.
@@ Line 206: / Line 206: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nSolveIter
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nSolveIter '''option specifies the number of times the snapping part of '''snappyHexMesh '''should be run.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nSolveIter '''option specifies the number of times the '''snapping''' part of '''snappyHexMesh '''should be run.
 |-
@@ Line 213: / Line 213: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nRelaxIter''' option specifies the number of times the mesh should run a relaxing script, that removes bad mesh points.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nRelaxIter''' option specifies the number of times the mesh should run a relaxing script, that removes bad '''mesh''' points.
 |-
@@ Line 220: / Line 220: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The process of mesh layer addition involves shrinking the existing mesh from the boundary and inserting layers of cells.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| The process of '''mesh''' layer addition involves shrinking the existing '''mesh''' from the boundary and inserting layers of cells.
-The first group of parameters define the dimensions for layers and surface on which they will be attached.
+The first group of parameters define the dimensions for layers and surface, on which they will be attached.
 |-
@@ Line 232: / Line 232: @@
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''RelativeSizes '''option (true or false) changes the way to read the parameters given next.
-- true: next parameters define the layers' dimensions as parameters.
+- '''true''': next parameters define the layers' dimensions as parameters.
-- false: next parameters define directly the layers' dimensions.
+- '''false''': next parameters define directly the layers' dimensions.
 |-
@@ Line 241: / Line 241: @@
-It must be an STL patch in '''geomery''' sub-menu, and not a user defined region.
+It must be an'''Bold text''' STL patch in '''geomery''' sub-menu, and not a user defined region.
 |-
@@ Line 255: / Line 255: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''FinalLayerThickness''' parameter sets the thickness of the last layer.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''finalLayerThickness''' parameter sets the thickness of the last layer.
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| minThickness
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''MinThickness''' parameter sets the minimum allowable thickness of layer.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''minThickness''' parameter sets the minimum allowable thickness of layer.
 |-
@@ Line 285: / Line 285: @@
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| maxFaceThicknessRatio
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''MaxFaceThicknessRatio''' option specifiess the maximum allowable value of aspect ratio.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''maxFaceThicknessRatio''' option specifiess the maximum allowable value of aspect ratio.
 |-
@@ Line 292: / Line 292: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| meshQualityControls parameter sets the minimum thresholds to generate mesh in snap and add-layers parts.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| meshQualityControls parameter sets the minimum thresholds to generate '''mesh''' in '''snap''' and add-layers parts.
@@ Line 298: / Line 298: @@
-But sometimes you can deactivate one or more controls to force mesh generation.
+But sometimes, you can deactivate one or more controls to force mesh generation.
 |-
@@ Line 305: / Line 305: @@
-These parameters are important to generate mesh using '''snappyHexMesh''' utility.
+These parameters are important to generate '''mesh''' using '''snappyHexMesh''' utility.
 |-

@@ Line 96: / Line 96: @@
-You can see the '''snappyHexMeshDict '''file.
+You can see '''snappyHexMeshDict '''file.
 |-
@@ Line 126: / Line 126: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Geometry
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In '''geometry''' section, all active regions that take part in snappy process can be defined.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| In the '''geometry''' section, all active regions that take part in snappy process can be defined.
 |-
@@ Line 278: / Line 278: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| ==== nRelaxIter ====
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nRelaxIter
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nRelaxIter''' option specifies the number of times the mesh will run a relaxing script.
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| ==== maxFaceThicknessRatio ====
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| maxFaceThicknessRatio
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''MaxFaceThicknessRatio''' option specifiess the maximum allowable value of aspect ratio.
@@ Line 358: / Line 358: @@
 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
-More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro
+More information on the same is available at following URL link http://spoken-tutorial.org/NMEICT-Intro
 |-

@@ Line 190: / Line 190: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nSmoothPatch
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified sentence is shown in the script.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
 '''nSmoothPatch '''option specifies the number of times the exterior (the boundary wall) should be iterated.
-−
-Original sentence:
-−
-−
-'''nSmoothPatch '''option changes how many times the exterior (the boundary wall) should be iterated.'''nSmoothPatch '''option specifies the number of times the exterior (the boundary wall) should be iterated.
@@ Line 203: / Line 198: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| tolerance
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified sentence is shown in the script.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"|
 '''Tolerance''' option specifies the distance the program should look, for a point to snap.
-−
-Original sentence:
-−
-'''Tolerance''' option changes how long distance the program should look for a point to snap.'''Tolerance''' option specifies the distance the program should look, for a point to snap.
@@ Line 215: / Line 206: @@
 |-
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| nSolveIter
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified Sentence'''nSolveIter '''option specifies the number of times the snapping part of '''snappyHexMesh '''should be run.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nSolveIter '''option specifies the number of times the snapping part of '''snappyHexMesh '''should be run.
 |-
@@ Line 222: / Line 213: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Modified Sentence'''nRelaxIter''' option specifies the number of times the mesh should run a relaxing script, that removes bad mesh points.
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''nRelaxIter''' option specifies the number of times the mesh should run a relaxing script, that removes bad mesh points.
 |-
@@ Line 257: / Line 248: @@
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''ExpansionRatio''' parameters Modified Sentencesets the growth factor of the '''layers''' (ratio between two subsequent layers).
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| '''ExpansionRatio''' parameters sets the growth factor of the '''layers''' (ratio between two subsequent layers).
 |-

@@ Line 29: / Line 29: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 2: Pre-requisite
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 3: Pre-requisite
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| As a pre-requisite, the user requires
@@ Line 40: / Line 40: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 3:
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 4:
 System Requirement
@@ Line 52: / Line 52: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 4: Methodology for snappyHexMesh
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 5: Methodology for snappyHexMesh
@@ Line 315: / Line 315: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 9: Summary
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 6: Summary
@@ Line 324: / Line 324: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 10: About Spoken tutorials
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 7: About Spoken tutorials
 | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Watch the video available at this URL:
@@ Line 334: / Line 334: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 11:
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 8:
 About Spoken tutorials
@@ Line 348: / Line 348: @@
 |-
-| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 12:
+| style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:none;padding:0.097cm;"| Slide 9:
 Acknowledgement