Difference between revisions of "OpenFOAM/C2/Creating-simple-geometry-in-OpenFOAM/English-timed"

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| 07:56
 
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| Now enter the '''type''' for the '''moving wall''' , enter '''type''' space  '''wall'''.   
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| Now, enter the '''type''' for the '''moving wall''' , enter "type" space  "wall".   
  
 
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| 08:09
 
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|Now insert open bracket and press '''Enter'''. Press the tab key, open close bracket.
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|Now, insert open bracket and press '''Enter'''. Press the '''tab''' key, open close bracket.
 
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|  08:20
 
|  08:20
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|In this bracket, enter the point for faces.
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|In this bracket, enter the points for faces.
 
|-
 
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|  08:24
 
|  08:24
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|Let me switch to the slide.
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|Let me switch back to the slide.
  
 
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| 08:27
 
| 08:27
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| Note that order of the points  should be in such a way that the '''thumb''' should be '''normal''' to the '''face '''.
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| Note that the order of the points  should be in such a way that the thumb should be normal to the face
  
 
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|  08:34
 
|  08:34
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| And fingers making a  curl  as shown in the figure.
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| and fingers making a  curl  as shown in the figure.
  
 
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|  08:43
 
|  08:43
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| Also, note that the points should match with the points inserted in vertices.
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| Also note that the points should match with the points inserted in vertices.
  
 
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|  08:48
 
|  08:48
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|Now, let me switch back to the new 'blockmeshdict' file.
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|Now, let me switch back to the new 'blockMeshDict' file.
  
 
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| 09:17
 
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|Close the bracket again, press  '''Enter'''. Close the curly bracket.
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|Close the bracket. Again press  '''Enter'''. Close the curly bracket.
 
|-
 
|-
 
| 09:22
 
| 09:22
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|Another note, we need to enter a semi colon. After you insert the points, a faces Now after the curly brackets, press  '''Enter''', again press  '''Enter'''.
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|Another note: we need to enter a semi colon after you insert the points for faces. Now after the curly brackets, press  '''Enter''', again press  '''Enter'''.
  
 
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|-
 
| 09:35
 
| 09:35
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|Now, similarly enter '''boundary condition''' and '''faces''' for the '''fixed wall '''.
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|Now, similarly enter '''boundary condition''' and '''faces''' for the '''fixed walls'''.
  
 
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| 09:40
 
| 09:40
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| Being a 2D problem the type of boundary for front and back faces can be kept as empty.
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| Being a 2D problem the type of boundary for the front and back faces can be kept as empty.
 
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| 10:04
 
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| Since there are no patches to merge, it can be kept empty.
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| Since there are no patches to be merged, it can be kept empty.
 
|-
 
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| 10:08
 
| 10:08
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| Insert open close bracket. Insert a semicolon and press  '''Enter'''.
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| Insert open close brackets. Insert a semicolon and press  '''Enter'''.
 
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|-
 
| 10:14
 
| 10:14
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| We are done with creating the  'blockmeshdict' file. '''Save''' this.    
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| We are done with creating the  'blockMeshDict' file. '''Save''' this.    
 
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| 10:29
 
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| Note that the '''command terminal''' will not work until '''blockMeshDict''' file is closed.  
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| Note that the '''command terminal''' will not work until the '''blockMeshDict''' file is closed.  
  
 
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|  10:35
 
|  10:35
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|  Switch back to the terminal. Now, type '''cd (dot) (dot)''' twice to return back to the 'cavity' folder. Now '''Mesh the geometry'''.  
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|  Switch back to the terminal. Now, type '''cd space (dot) (dot)''' twice to return back to the 'cavity' folder. Now '''Mesh the geometry'''.  
  
 
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|10:45
 
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|To do this, on the '''terminal''', type: "blockMesh" and press  '''Enter'''.
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|To do this, on the terminal, type: "blockMesh" and press  '''Enter'''.
  
 
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| 10:53
 
| 10:53
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|Now, view the '''geometry''' by typing in the '''command terminal''' '''paraFoam''' and press  '''Enter'''.
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|Now, view the '''geometry''' by typing on the '''command terminal''' '''paraFoam''' and press  '''Enter'''.
  
 
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| 11:03
 
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| Now, on the left hand side, click '''Apply''' on '''object inspector menu'''. Thus, you can see the geometry.
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| Now, on the left hand side, click '''Apply''' on '''object inspector''' menu. Thus, you can see the geometry.
  
 
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| 11:13
 
| 11:13
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| Now let me switch back to  the slides.
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| Now, let me switch back to  the slides.
  
 
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| 11:22
 
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|* Viewing the '''geometry''' in '''Paraview '''.
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|* Viewing the geometry in '''Paraview '''.
  
 
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| 11:31
 
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| Change the direction  of '''lid driven cavity''', change  the '''grid size''' to '''50 50 1'''and view the geometry in '''paraview'''.  
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| Change the dimensions of the '''lid driven cavity''', change  the grid size to '''50 50 1''' and view the geometry in '''paraView'''.  
  
 
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| 11:46
 
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| If you do not have good bandwidth, you can download and watch it.  
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| If you do not have a good bandwidth, you can download and watch it.  
  
 
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| 12:05
 
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|  '''Spoken Tutorial''' project is part of '''Talk to a Teacher''' project.  
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|  '''Spoken Tutorial''' project is part of the '''Talk to a Teacher''' project.  
  
 
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| 12:15
 
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| More information on the same is available at the following URL link:
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| More information on this mission is available at the following URL:
 
[http://spoken-tutorial.org/NMEICT-Intro]
 
[http://spoken-tutorial.org/NMEICT-Intro]
  

Revision as of 16:10, 23 June 2016

Time Narration
00:01 Hello and welcome to the spoken tutorial on creating simple geometry in OpenFOAM.
00:06 In this tutorial, I will show you:
00:08 * How to create simple geometry
00:11 * How to view the geometry in paraview.
00:15 To record this tutorial,
00:16 I am using:
  • Linux Operating system Ubuntu version 10.04
  • OpenFOAM version 2.1.0
  • ParaView version 3.12.0
00:27 In CFD the Pre-processing part consists of creating geometry and meshing it.
00:33 Let us take the Lid driven cavity case of the previous tutorial as an example.
00:38 Recall the path for the earlier tutorial.
00:40 I have already opened the command terminal and entered the path for lid driven cavity.
00:48 There are three folders '0, constant' and 'system'. 'Geometry' is inside the 'polymesh' folder of 'constant'.
00:55 In the command terminal, type: cd space constant and press Enter.
01:03 Now, type "ls" and press Enter.
01:06 In this, there is another folder called as 'polyMesh'.
01:10 Now type: cd space polymesh and press Enter.
01:18 Now type "ls" and press Enter.
01:22 This contains the 'geometry' file called as 'blockMeshDict'.
01:26 Open the 'blockMeshDict' file with any editor of your choice.
01:30 In the terminal, type: gedit space blockMeshDict( Note that M and D are capital) and press Enter.
01:45 Let me drag this to the capture area.
01:49 Now minimize this.
01:53 Let me switch back to the slide.
01:55 In openfoam, the entire geometry is broken into blocks .
01:59 The blocks are numbered starting from 0 (zero) as shown in the figure.
02:08 Note that in OpenFOAM, for creating a 2D geometry you need to give an unit cell thickness value in the z-axis.
02:19 lid driven cavity is of length 1 and height 1. Minimize the slide.
02:29 On your desktop, create an empty file by right click > create document > Empty file. Name this as 'blockMeshDict'. (Note that M and D here are capital).
02:48 Open this. Now, copy the data from the original lid driven cavity 'blockMeshDict' file to the new 'blockMeshDict' file from line 0.
02:59 Scroll up line 0 upto 'convertTometers'. Copy this and paste it here.
03:15 Scroll down. Now leave some space after 'converttometers'.
03:21 Enter 1 as the geometry is in meters. Insert a semicolon and press Enter.
03:30 Again press Enter. In the file, type "vertices" and press Enter.
03:39 Insert the open bracket and press Enter.
03:43 Press the tab key. Start with point 0, insert open, close brackets, Enter.
03:52 0 space 0 space 0 and press Enter. Again, press tab key, open close bracket .
04:02 Move towards point 1 in positive x-axis and enter 1 space 0 space 0 and press Enter.
04:12 Again press the tab key, open close bracket. Move towards point 2 in the positive x-y plane and enter 1 space 1 space 0 and press Enter.
04:26 Again press tab key, open close bracket. Enter the 3rd point in positive y-axis 0 space 1 space 0 , press Enter.
04:39 Again press the tab key. Enter the 4th point on the front face, open close bracket, 0 space 0 space 0.1 and press Enter.
04:51 Similarly, enter the other points with one unit value in the positive z- axis.
04:56 close the bracket and insert a semicolon after it. Press Enter, again press Enter.
05:03 Below vertices are the blocks. Type blocks and press Enter. Insert a open bracket and press Enter.
05:16 Let me switch back to the slides.
05:19 Note that Lid driven cavity is taken as a single block.
05:24 Let me switch back to 'blockmeshdict'.
05:27 Enter the points for the block in the clockwise sense.
05:31 We are using here hexa hedral blocks for meshing.
05:34 Now, type "hex". Leave some space. In brackets, enter 0 space 1 2 3 4 5 6 7 , again leave some space.
05:53 Note that for multiple blocks, the points will be more.
05:58 After this, enter the grid points in the x, y and z directions.
06:02 In brackets, open close brackets, enter 30 space 30 space 1. Leave some space, you can modify the grid as and when needed.
06:16 Grid point in the z-axis can be taken as one.
06:22 Now, leave some space and type "simple Grading". Leave some space, open close bracket, enter 1 space 1 space 1 .
06:36 This is the grid spacing in the x, y and z directions. Press Enter.
06:43 Insert close bracket, insert a semicolon and press Enter.
06:48 Again press Enter. Now type "edges" and press Enter.
06:55 As this is a simple geometry, edges can be kept empty.
07:00 Insert open bracket, press Enter, close the bracket. Insert a semicolon and press Enter.
07:07 Again press Enter. Below edges are the boundary conditions.
07:11 Here you need to enter the boundary names for the faces.
07:15 Type "boundary" and press Enter .
07:19 Insert an open bracket and press Enter.
07:23 Now, let me switch back to the slides.
07:26 In the geometry, the upper wall is moving and other three walls are fixed.
07:31 The front and back faces are named as 'empty' as this is a 2D problem.
07:39 Open the new 'blockMeshDict' file again.
07:42 In boundary, put the name of the patch as 'moving wall' . Press Enter.
07:51 Now, insert a open curly bracket and press Enter.
07:56 Now, enter the type for the moving wall , enter "type" space "wall".
08:06 Insert a semicolon and press Enter.
08:09 Now, insert open bracket and press Enter. Press the tab key, open close bracket.
08:20 In this bracket, enter the points for faces.
08:24 Let me switch back to the slide.
08:27 Note that the order of the points should be in such a way that the thumb should be normal to the face
08:34 and fingers making a curl as shown in the figure.
08:39 The curl can be clockwise or anti-clockwise.
08:43 Also note that the points should match with the points inserted in vertices.
08:48 Now, let me switch back to the new 'blockMeshDict' file.
08:52 Now in the faces, enter 3 space 7 space 6 space 2.
09:01 Let me switch back to the slide. These are the points for the moving wall 3, 7, 6, 2.
09:09 Minimize this. Note that you can start from any point on that face. Now press Enter.
09:17 Close the bracket. Again press Enter. Close the curly bracket.
09:22 Another note: we need to enter a semi colon after you insert the points for faces. Now after the curly brackets, press Enter, again press Enter.
09:35 Now, similarly enter boundary condition and faces for the fixed walls.
09:40 Being a 2D problem the type of boundary for the front and back faces can be kept as empty.
09:46 Refer to the figure in the slide. For entering the points, minimize this.
09:52 Insert the closed brackets, put a semicolon and press Enter, again press Enter.
09:59 Now type "mergePatchPairs" and press Enter.
10:04 Since there are no patches to be merged, it can be kept empty.
10:08 Insert open close brackets. Insert a semicolon and press Enter.
10:14 We are done with creating the 'blockMeshDict' file. Save this.
10:18 The complete 'blockMeshDict' file is as shown here.
10:26 Close both the 'blockMeshDict' files.
10:29 Note that the command terminal will not work until the blockMeshDict file is closed.
10:35 Switch back to the terminal. Now, type cd space (dot) (dot) twice to return back to the 'cavity' folder. Now Mesh the geometry.
10:45 To do this, on the terminal, type: "blockMesh" and press Enter.
10:53 Now, view the geometry by typing on the command terminal paraFoam and press Enter.
10:59 This will open the ParaView window.
11:03 Now, on the left hand side, click Apply on object inspector menu. Thus, you can see the geometry.
11:13 Now, let me switch back to the slides.
11:16 In this tutorial, we learnt:
11:18 * Creating a simple geometry in OpenFOAM
11:22 * Viewing the geometry in Paraview .
11:25 This brings us to the end of the tutorial.
11:29 As an Assignment-
11:31 Change the dimensions of the lid driven cavity, change the grid size to 50 50 1 and view the geometry in paraView.
11:41 Watch the video available at this URL: [1]
11:44 It summarizes the Spoken Tutorial project.
11:46 If you do not have a good bandwidth, you can download and watch it.
11:51 The Spoken Tutorial project team:
11:53 * Conducts workshops using spoken tutorials
11:55 * Gives certificates to those who pass an online test.
11:59 For more details, please write to:

contact@spoken-tutorial.org

12:05 Spoken Tutorial project is part of the Talk to a Teacher project.
12:09 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
12:15 More information on this mission is available at the following URL:

[2]

12:19 This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining.

Contributors and Content Editors

DeepaVedartham, Gaurav, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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