Difference between revisions of "OpenFOAM/C3/Generating-Mesh-using-snappyHexMesh/English-timed"

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(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...")
 
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|-
 
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| 00:01
 
| 00:01
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| Hello and welcome to the spoken tutorial on generating mesh using '''snappyHexMesh in OpenFOAM'''.
+
| Hello and welcome to the '''spoken tutorial''' on '''generating mesh using snappyHexMesh''' in '''OpenFOAM'''.
  
 
|-
 
|-
 
| 00:08
 
| 00:08
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| In this tutorial we will learn to
+
| In this tutorial, we will learn to:
−
* Generate mesh using '''snappyHexMesh''' utility
+
* Generate '''mesh''' using '''snappyHexMesh''' utility
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* Simulate temperature distribution of a '''flange'''.  
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* '''Simulate''' temperature distribution of a '''flange'''.  
  
 
|-
 
|-
 
| 00:18
 
| 00:18
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| As a pre-requisite,
+
| As a pre-requisite, you should know parameters in '''snappyHexMeshDict''' to generate '''mesh'''.
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* You should know parameters in '''snappyHexMeshDict''' to generate mesh.
+
For more details, refer the tutorial on '''introduction to snappyHexMesh''' in '''OpenFOAM'''.
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* For more details, refer the tutorial on introduction to '''snappyHexMesh''' in '''OpenFOAM'''.
+
  
 
|-
 
|-
 
| 00:31
 
| 00:31
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| To record this tutorial, I am using  
+
| 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
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| 00:46
 
| 00:46
 
| We are solving an existing case of '''flange '''from'''laplacianFoam''' in '''basic '''directory.
 
| We are solving an existing case of '''flange '''from'''laplacianFoam''' in '''basic '''directory.
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'''laplacianFoam''' solver solves simple '''laplace''' equations.
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''''laplacianFoam' solver''' solves simple '''Laplace''' equations.
  
 
|-
 
|-
 
| 00:58
 
| 00:58
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| Now let us go to '''home''' folder and click on '''OpenFoam-2.2.2''' folder.
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| Now, let us go to '''home''' folder and click on '''OpenFoam-2.2.2''' folder.
  
 
|-
 
|-
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|-
 
|-
 
| 01:09
 
| 01:09
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| Then click on '''mesh''' folder'''.'''
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| Then click on '''mesh''' folder.  
  
 
|-
 
|-
 
| 01:12
 
| 01:12
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| You will see the '''snappyHexMesh '''folder. Click on it
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| You will see the '''snappyHexMesh '''folder. Click on it.
  
 
|-
 
|-
 
| 01:17
 
| 01:17
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| In this folder, create a new '''folder''' by name '''flange_1.'''
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| In this folder, create a new folder by name '''flange_1.'''
  
 
|-
 
|-
 
| 01:24
 
| 01:24
−
| Now let's go back two levels.
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| Now, let's go back two levels.
  
 
|-
 
|-
 
| 01:27
 
| 01:27
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| Open the '''basic''' folder. You will see '''laplacianFoam''' folder.Click on it.
+
| Open the '''basic''' folder. You will see '''laplacianFoam''' folder. Click on it.
  
 
|-
 
|-
 
| 01:36
 
| 01:36
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| You will see '''flange''' case.Click on it to open the folder.
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| You will see '''flange''' case. Click on it to open the folder.
  
 
|-
 
|-
 
| 01:42
 
| 01:42
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| Copy the three folders '''0, constant and system.'''
+
| Copy the three folders '''0, constant''' and '''system'''.
  
 
|-
 
|-
 
| 01:46
 
| 01:46
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| Now let us go three levels back.Paste the copied '''folders''' inside the '''flange_1 '''folder.
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| Now, let us go three levels back. '''Paste''' the copied folders inside the '''flange_1 '''folder.
  
 
|-
 
|-
 
| 01:56
 
| 01:56
−
| Now let us go one level back.  Click on '''flange''' folder.You will see '''constant''' and '''system''' folders.
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| Now, let us go one level back.  Click on '''flange''' folder. You will see '''constant''' and '''system''' folders.
  
 
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|-
 
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| 02:08
 
| 02:08
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| Copy '''snappyHexMeshDict''' and '''surfaceFeatureExtractDict '''from this folder. Now let us go two levels back.  
+
| Copy '''snappyHexMeshDict''' and '''surfaceFeatureExtractDict '''from this folder. Now, let us go two levels back.  
  
 
|-
 
|-
 
| 02:18
 
| 02:18
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| Paste these two files inside the '''system''' directory of '''flange_1 '''folder.  
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| '''Paste''' these two files inside the '''system''' directory of '''flange_1 '''folder.  
  
 
|-
 
|-
 
| 02:27
 
| 02:27
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| Now let us go one level back.Click on '''constant''' folder.In this, create a '''folder''' by name '''triSurface.'''  
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| Now, let us go one level back. Click on '''constant''' folder. In this, create a folder by name '''triSurface.'''  
  
 
|-
 
|-
 
| 02:40
 
| 02:40
−
| Now let us go four levels back.
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| Now, let us go four levels back.
  
 
|-
 
|-
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| 02:48
 
| 02:48
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| You will see '''geometry''' folder.Now, open the '''geometry''' folder.
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| You will see '''geometry''' folder. Now, open the '''geometry''' folder.
  
 
|-
 
|-
 
| 02:53
 
| 02:53
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| In this, you will see '''flange.stl.gz''' file.Extract this file.
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| In this, you will see '''flange.stl.gz''' file. Extract this file.
  
 
|-
 
|-
 
| 03:04
 
| 03:04
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| Give the path of '''triSurface''' folder in '''constant''' directory of '''flange_1''' folder.Now close this.
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| Give the '''path''' of '''triSurface''' folder in '''constant''' directory of '''flange_1''' folder. Now close this.
  
 
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| 03:16
 
| 03:16
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| 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'''
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| Open '''command terminal''' and enter the '''path''' for '''flange_1 '''as shown. Type: '''cd space OpenFOAM-2.2.2/tutorials/mesh/snappyHexMesh/flange_1''' and press '''Enter'''.
  
 
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| 03:42
 
| 03:42
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| Now type '''ls''' and press '''Enter.'''
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| Now type "ls" and press '''Enter.'''
  
 
|-
 
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| 03:46
 
| 03:46
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| There are three folders''' 0, constant '''and '''system'''.Type '''cd space constant''' and press '''Enter.'''
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| There are three folders''' 0, constant '''and '''system'''. Type '''cd space constant''' and press '''Enter.'''
  
 
|-
 
|-
 
| 03:55
 
| 03:55
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| Now type''' ls '''and press '''Enter'''.You will see the '''polymesh''' and '''triSurface''' folders.
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| Now type "ls" and press '''Enter'''. You will see the '''polymesh''' and '''triSurface''' folders.
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Type '''cd space polymesh''' and press '''Enter.'''
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Type: '''cd space polymesh''' and press '''Enter.'''
  
 
|-
 
|-
 
| 04:09
 
| 04:09
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| Now type''' ls '''and press '''Enter'''.You can see the''' blockMeshDict '''file.
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| Now type: "ls" and press '''Enter'''. You can see the''' blockMeshDict '''file.
  
 
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|-
 
| 04:16
 
| 04:16
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|To view the contents of the file, type  '''gedit blockMeshDict''' and press '''Enter.'''
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|To view the contents of the file, type: '''gedit space blockMeshDict''' and press '''Enter.'''
  
 
|-
 
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| 04:26
 
| 04:26
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| This will open up the '''blockMeshDict''' file.This file contains '''co-ordinates '''for '''hex mesh '''and '''boundary patches'''.
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| This will open up the '''blockMeshDict''' file. This file contains co-ordinates for '''hex mesh '''and '''boundary patches'''.
  
 
|-
 
|-
 
| 04:36
 
| 04:36
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| Now close this and in the''' command terminal''' type '''cd (space) .. (dot) (dot) '''and press '''Enter'''.
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| 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'''.
  
 
|-
 
|-
 
| 04:48
 
| 04:48
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| Now type '''cd space system''' and press '''Enter.'''
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| Now, type: '''cd space system''' and press '''Enter.'''
  
 
|-
 
|-
 
| 04:53
 
| 04:53
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| Now type''' ls''' and press '''Enter.'''You can see the''' surfaceFeatureExtractDict '''file.
+
| Now type: "ls" and press '''Enter.''' You can see the''' surfaceFeatureExtractDict '''file.
  
 
|-
 
|-
 
| 05:01
 
| 05:01
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| To view the contents of the file, type '''gedit''' '''surfaceFeatureExtractDict '''and press '''Enter.'''
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| 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).
  
 
|-
 
|-

Revision as of 11:05, 5 July 2016

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 fromlaplacianFoam 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 space 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 space 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 space 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.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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