OpenFOAM/C3/Generating-Mesh-using-snappyHexMesh/English-timed - Revision history

PoojaMoolya at 10:17, 10 March 2017

2017-03-10T10:17:55Z

PoojaMoolya at 13:07, 20 February 2017

2017-02-20T13:07:10Z

Sandhya.np14 at 05:59, 5 July 2016

2016-07-05T05:59:14Z

Sandhya.np14 at 05:57, 5 July 2016

2016-07-05T05:57:46Z

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Sandhya.np14 at 05:35, 5 July 2016

2016-07-05T05:35:25Z

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Pratik kamble: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and welcome to the spoken tutorial on generating mesh using '''snappyHexMesh in OpenFOAM'''. |- | 00:08 | In th..."

2015-11-26T06:56:15Z

Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and welcome to the spoken tutorial on generating mesh using '''snappyHexMesh in OpenFOAM'''. |- | 00:08 | In th..."

New page

{| border=1
| '''Time'''
| '''Narration'''

|-
| 00:01
| Hello and welcome to the spoken tutorial on generating mesh using '''snappyHexMesh in OpenFOAM'''.

|-
| 00:08
| In this tutorial we will learn to
* Generate mesh using '''snappyHexMesh''' utility
* Simulate temperature distribution of a '''flange'''.

|-
| 00:18
| As a pre-requisite,
* You should know parameters in '''snappyHexMeshDict''' to generate mesh.
* For more details, refer the tutorial on introduction to '''snappyHexMesh''' in '''OpenFOAM'''.

|-
| 00:31
| To record this tutorial, I am using
* '''Ubuntu''' '''Linux''' Operating system version 12.04.
* '''OpenFOAM''' version 2.2.2
* '''ParaView''' version 3.12.0

|-
| 00:46
| We are solving an existing case of '''flange '''from'''laplacianFoam''' in '''basic '''directory.
'''laplacianFoam''' solver solves simple '''laplace''' equations.

|-
| 00:58
| Now let us go to '''home''' folder and click on '''OpenFoam-2.2.2''' folder.

|-
| 01:05
| You will see '''tutorials. '''Click on it.

|-
| 01:09
| Then click on '''mesh''' folder'''.'''

|-
| 01:12
| You will see the '''snappyHexMesh '''folder. Click on it

|-
| 01:17
| In this folder, create a new '''folder''' by name '''flange_1.'''

|-
| 01:24
| Now let's go back two levels.

|-
| 01:27
| Open the '''basic''' folder. You will see '''laplacianFoam''' folder.Click on it.

|-
| 01:36
| You will see '''flange''' case.Click on it to open the folder.

|-
| 01:42
| Copy the three folders '''0, constant and system.'''

|-
| 01:46
| Now let us go three levels back.Paste the copied '''folders''' inside the '''flange_1 '''folder.

|-
| 01:56
| Now let us go one level back. Click on '''flange''' folder.You will see '''constant''' and '''system''' folders.

|-
| 02:05
|Click on '''system''' folder.

|-
| 02:08
| Copy '''snappyHexMeshDict''' and '''surfaceFeatureExtractDict '''from this folder. Now let us go two levels back.

|-
| 02:18
| Paste these two files inside the '''system''' directory of '''flange_1 '''folder.

|-
| 02:27
| Now let us go one level back.Click on '''constant''' folder.In this, create a '''folder''' by name '''triSurface.'''

|-
| 02:40
| Now let us go four levels back.

|-
| 02:44
| Open the '''resources''' folder.

|-
| 02:48
| You will see '''geometry''' folder.Now, open the '''geometry''' folder.

|-
| 02:53
| In this, you will see '''flange.stl.gz''' file.Extract this file.

|-
| 03:04
| Give the path of '''triSurface''' folder in '''constant''' directory of '''flange_1''' folder.Now close this.

|-
| 03:16
| Open '''command terminal''' and enter the path for '''flange_1 '''as shown.Type '''cd OpenFOAM-2.2.2/tutorials/mesh/snappyHexMesh/flange_1''' and press '''Enter'''

|-
| 03:42
| Now type '''ls''' and press '''Enter.'''

|-
| 03:46
| There are three folders''' 0, constant '''and '''system'''.Type '''cd space constant''' and press '''Enter.'''

|-
| 03:55
| Now type''' ls '''and press '''Enter'''.You will see the '''polymesh''' and '''triSurface''' folders.
Type '''cd space polymesh''' and press '''Enter.'''

|-
| 04:09
| Now type''' ls '''and press '''Enter'''.You can see the''' blockMeshDict '''file.

|-
| 04:16
|To view the contents of the file, type '''gedit blockMeshDict''' and press '''Enter.'''

|-
| 04:26
| This will open up the '''blockMeshDict''' file.This file contains '''co-ordinates '''for '''hex mesh '''and '''boundary patches'''.

|-
| 04:36
| Now close this and in the''' command terminal''' type '''cd (space) .. (dot) (dot) '''and press '''Enter'''.
Again type '''cd (space) .. (dot) (dot)''' and press '''Enter'''.

|-
| 04:48
| Now type '''cd space system''' and press '''Enter.'''

|-
| 04:53
| Now type''' ls''' and press '''Enter.'''You can see the''' surfaceFeatureExtractDict '''file.

|-
| 05:01
| To view the contents of the file, type '''gedit''' '''surfaceFeatureExtractDict '''and press '''Enter.'''
(Note that F, E and D here are capital)

|-
| 05:15
| This will open up the '''surfaceFeatureExtractDict''' file.

|-
| 05:19
|This file contains the information about geometry’s feature edges.The included angle is taken as 150.

|-
|05:29
| Now close this.In '''command terminal''' type '''gedit snappyHexMeshDict''' and press '''Enter.'''
(Note that H, M and D here are capital)

|-
| 05:45
| This will open up the '''snappyHexMeshDict''' file.This file contains all the instructions about '''snappyHexMesh'''.

|-
| 05:53
| In '''snappyHexMeshDict''' I have already made some changes.I have named '''flange.stl''' same as that of '''STL''' file, which is in the '''constant/trisurface''' directory.

|-
| 06:11
| For '''Explicit feature edge refinement''' in '''castellatedMeshControls,''' I have given the file name '''flange.eMesh'''.This file is obtained by '''surfaceFeatureExtract''' utility.

|-
| 06:23
|The remaining details in the '''snappyHexMesh''' have changed as per requirements.

|-
| 06:30
| Now close this and in '''command terminal, type '''cd (space) .. (dot) (dot) '''and press '''Enter.'''

|-
| 06:38
| Type '''cd space 0''' and press '''Enter.'''

|-
| 06:44
| Type '''ls''' and press '''Enter.'''You can see the''' T''' file.

|-
| 06:50
| Now type '''gedit space T''' and press '''Enter.'''

|-
| 06:55
| This will open up the''' T''' file.You will see the initial conditions for every '''patch'''.

|-
|07:04
| Now, we have to give initial conditions for all '''patches''' of '''flange'''.

|-
| 07:11
| Copy the initial conditions for '''patch 1 '''and paste it after '''patch 4''' in the same file '''T.'''Now type '''flange_''' before this '''patch 1'''.

|-
| 07:28
|Similarly, we can do this for '''patch 2, 3 '''and '''4'''.Save this '''T''' file and close it.

|-
| 07:37
| And in the '''command terminal '''type '''cd (space) .. (dot) (dot)'''and press '''Enter.'''

|-
| 07:43
| Now, we need to '''mesh''' the '''geometry'''.For that in '''command terminal,''' type '''blockMesh''' and press '''Enter.''''''Meshing''' is done.

|-
| 07:55
| Now type '''surfaceFeatureExtract''' and press '''Enter.''' (Note that F and E here are capital.)
'''Surface feature extraction''' is done.

|-
| 08:09
| Now type '''snappyHexMesh -(dash) overwrite''' and press '''Enter.''' '''- (dash) overwrite '''command will prevent copying the files from the last time folders.

|-
| 08:24
| If not, the resulting '''meshes''' will be inside the next time folders, possibly the folders '''1''', '''2''' and '''3'''.

|-
| 08:31
| '''Meshing''' will take some time.Now '''meshing''' is completed.

|-
|08:36
| For simulating temperature distribution, we are using '''laplacianFoam''' solver.

|-
| 08:42
| In the '''command terminal''' type '''laplacianFoam''' and press '''Enter'''.(Note that F here is capital.)

|-
| 08:51
|Iterations running will be seen in the '''terminal''' window.

|-
| 08:55
| Once solving is completed, type '''paraFoam''' and press '''Enter '''to view the geometry and the results.This will open up the '''Paraview''' window.

|-
| 09:07
| On the left hand side of '''Paraview''' window, click on '''Apply.'''The geometry can be seen here.

|-
| 09:15
| Scroll down the properties panel of the '''object''' '''inspector''' menu.Check the box for '''T '''in the volume fields and click on '''Apply'''.

|-
| 09:25
| Now go to the top of '''Active variable control''' drop down menu. Change from solid color to capital '''T,''' which is the initial condition for the '''flange'''.

|-
| 09:37
| Now on the top of the '''Paraview '''window, you can see the '''VCR''' controls. Click on the '''Play '''button.Now this is the final result for temperature distribution of a '''flange'''.

|-
| 09:58
| Toggle on the color legend by clicking on top left of the '''Active variable control''' menu.
This is the colour legend for temperature '''T'''.

|-
| 10:09
|Now let me get back to the slides.

|-
| 10:12
| This brings us to the end of the tutorial.As an assignment,

|-
| 10:16
|Change some parameters in the '''snappyHexMeshDict''':
* '''Refinement''' parameters
* '''locationInMesh co-ordinates'''
* '''snapControls''', etc.

|-
| 10:26
|You can also change the temperature in the '''0''' folder and view the results in '''Paraview'''.

|-
| 10:33
| In this tutorial we learnt :
* To generate mesh by '''snappyHexMesh '''utility in '''OpenFoam'''.
*Simulate temperature distribution of a '''flange'''.

|-
| 10:44
| 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.

|-
| 10:57
| The Spoken Tutorial Project TeamConducts workshops using spoken tutorials.Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org

|-
| 11:14
| Spoken Tutorials are part of Talk to a Teacher project, It is supported by National Mission on Education through ICT, MHRD, Government of India. More information on the same is available at following URL link http://spoken-tutorial.org/NMEICT-Intro

|-
| 11:29
| This is Chaitrali Ghodke from IIT BOMBAY signing off.Thanks for joining.

|}

@@ Line 10: / Line 10: @@
 | 00:08
 | In this tutorial, we will learn to:
-* Generate '''mesh''' using '''snappyHexMesh''' utility
+Generate '''mesh''' using '''snappyHexMesh''' utility
-* '''Simulate''' temperature distribution of a '''flange'''.
+'''Simulate''' temperature distribution of a '''flange'''.
 |-
@@ Line 21: / Line 21: @@
 | 00:31
 | To record this tutorial, I am using:
-* '''Ubuntu Linux Operating system''' version 12.04.
+'''Ubuntu Linux Operating system''' version 12.04.
-* '''OpenFOAM''' version 2.2.2
+'''OpenFOAM''' version 2.2.2
-* '''ParaView''' version 3.12.0
+'''ParaView''' version 3.12.0
 |-
@@ Line 124: / Line 124: @@
 |-
 | 03:55
-| Now type "ls" and press '''Enter'''. You will see the '''polymesh''' and '''triSurface''' folders.
+| Now type "ls" and press '''Enter'''. You will see the '''polymesh''' and '''triSurface''' folders.Type: '''cd space polymesh''' and press '''Enter.'''
 Type: '''cd space polymesh''' and press '''Enter.'''
 |-
@@ Line 141: / Line 140: @@
 |-
 | 04:36
-| Now close this and in the command terminal, type: '''cd (space) .. (dot) (dot) '''and press '''Enter'''.
+| Now close this and in the command terminal, type: '''cd (space) .. (dot) (dot) '''and press '''Enter'''. Again type: '''cd (space) .. (dot) (dot)''' and press '''Enter'''.
 Again type: '''cd (space) .. (dot) (dot)''' and press '''Enter'''.
 |-
@@ Line 154: / Line 152: @@
 |-
 | 05:01
-| To view the contents of the file, type: '''gedit space surfaceFeatureExtractDict '''and press '''Enter'''
+| To view the contents of the file, type: '''gedit space surfaceFeatureExtractDict '''and press '''Enter'''(Note that F, E and D here are capital).
 (Note that F, E and D here are capital).
 |-
@@ Line 167: / Line 164: @@
 |-
 |05:29
-| Now close this. In command terminal, type: '''gedit space snappyHexMeshDict''' and press '''Enter'''
+| Now close this. In command terminal, type: '''gedit space snappyHexMeshDict''' and press '''Enter'''(Note that H, M and D here are capital).
 (Note that H, M and D here are capital).
 |-
@@ Line 228: / Line 224: @@
 |-
 | 07:55
-| Now type: '''surfaceFeatureExtract''' and press '''Enter''' (Note that F and E here are capital).
+| Now type: '''surfaceFeatureExtract''' and press '''Enter''' (Note that F and E here are capital).'''Surface feature extraction''' is done.
 '''Surface feature extraction''' is done.
 |-
@@ Line 277: / Line 272: @@
 |-
 | 09:58
-| '''Toggle''' on the '''color legend''' by clicking on top left of the '''Active variable control''' menu.
+| '''Toggle''' on the '''color legend''' by clicking on top left of the '''Active variable control''' menu.This is the '''colour legend''' for temperature '''T'''.
 This is the '''colour legend''' for temperature '''T'''.
 |-
@@ Line 291: / Line 285: @@
 | 10:16
 |Change some parameters in the '''snappyHexMeshDict''':
-* '''Refinement''' parameters
+'''Refinement''' parameters
-* '''locationInMesh''' co-ordinates
+'''locationInMesh''' co-ordinates
-* '''snapControls''' etc.
+'''snapControls''' etc.
 |-
@@ Line 302: / Line 296: @@
 | 10:33
 | In this tutorial, we learnt :
-* To generate mesh by '''snappyHexMesh '''utility in '''OpenFoam'''.
+To generate mesh by '''snappyHexMesh '''utility in '''OpenFoam'''. Simulate temperature distribution of a '''flange'''.
-* Simulate temperature distribution of a '''flange'''.
 |-
 | 10:44
-| Watch the video available at this URL:
+| Watch the video available at this URL:http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
 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.
@@ Line 315: / Line 307: @@
 | 10:57
 | The Spoken Tutorial Project team:
-* Conducts workshops using spoken tutorials.
+Conducts workshops using spoken tutorials.
-* Gives certificates to those who pass an online test.
+Gives certificates to those who pass an online test. For more details, please write to: '''contact@spoken-tutorial.org'''
 For more details, please write to: '''contact@spoken-tutorial.org'''
 |-
 | 11:14
 | '''Spoken Tutorials''' are part of '''Talk to a Teacher''' project. It is supported by National Mission on Education through ICT, MHRD, Government of India.
-More information on the same is available at following URL:
+More information on the same is available at following URL:http://spoken-tutorial.org/NMEICT-Intro
 http://spoken-tutorial.org/NMEICT-Intro
 |-