View source for OpenFOAM/C2/Creating-curved-geometry-in-OpenFOAM/English-timed

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|| '''Time'''
|| '''Narration'''

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| 00:01
| Hello and welcome to the spoken tutorial on '''Creating Curved geometry in OpenFOAM'''

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| 00:06
| In this tutorial I will show you 

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| 00:09
|'''Steps''' for creating  a '''curved geometry in openfoam'''

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| 00:14
|Viewing the results in '''paraview'''

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| 00:17
|To record this tutorial 

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| 00:19
|I am using '''Linux Operating system Ubuntu version 10.04'''.  '''OpenFOAM version 2.1.0 '''

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| 00:28
|'''ParaView version 3.12.0 '''

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| 00:32
|We will create a '''geometry''' for '''flow over cylinder'''.

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| 00:36
|Note that I am using this case just for '''explanation'''.

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| 00:41
|The '''cylinder '''is in a form of a '''semi circle.'''

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| 00:45
|'''Meshing''' is a body fitted grid.

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| 00:49 
|The entire '''geometry''' is divided into blocks.


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| 00:54
|We break the '''semi circle''' into equal number of '''parts'''.

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| 00:58
|Now minimise this

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| 01:03
| Open a '''blockMeshDict '''file of the previous tutorial

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| 01:08
|I have already opened it

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| 01:12
|Scroll down, for '''simple geometries''' you can see that  '''edges '''is kept empty 

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|  01:20
|   Now Create a new '''blockMeshDict''' file 

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| 01:23
|To do this let us '''minimise''' this first

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| 01:27
|  Now '''Right click > create document > empty file'''

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|  01:34
|  Name this as '''blockMeshDict'''.

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| 01:40
|Note that M and D here are capital

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| 01:46
|Open this

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|  01:51
| Now you can copy the initial few lines from the '''lid driven cavity''' upto '''convertTometers'''

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| 01:58
|Go up '''copy''' this upto '''convertToMeters'''

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| 02:04
|  '''Copy this''' and '''paste it''' in the new '''blockMeshDict''' file

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| 02:12
|Now  change the '''convert to meters''' from '''point one to one'''

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| 02:18
| As our '''geometry''' is in '''meters''' we will keep this as one

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| 02:24
| Now press '''enter''' ,  press '''enter''' again

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|02:28
| After this you need to enter the '''co-ordinates''' of the''' geometry''' in '''vertices'''

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| 02:35
|Let me switch back to the slide. Note that the points should be ordered  in such a way starting from '''0,1,2,3, 4''' and so on. as shown in the figure

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|  02:47
| Minimise the slide. Now type '''vertices''' in the '''blockMeshDict''' file and press '''Enter'''

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|  02:56
| Insert the open bracket and Press '''Enter'''

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|  03:00
|   Now enter the '''co-ordinates''' of  a geometry as shown in the '''diagram'''.

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|  03:05
| Let me switch back to the slides

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| 03:08
|  For explanation I will use right half of the semi-circle

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|  03:12
| Enter the values for the points in the figure starting from 0

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| 03:16
|Let me switch back to the '''blockMeshDict''' file

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|03:20
|  leave some space and enter the '''co-ordinates''' of '''point 0'''

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|  03:27
|  Open close bracket  enter '''0.5 (space) 0 (space) 0'''. Press Enter

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|  03:36
| Again leave some space , open close bracket

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| 03:39
|Enter co-ordinates for point  1 (space) 0 (space) 0. Press enter

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| 03:45
|Now leave two '''vertical spaces''' , again  press '''Enter''', again  press '''Enter'''
  
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| 03:51
| leave some space and enter the '''co-ordinate '''for   point number 4

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| 03:57
| Open,  close bracket, enter '''0.707 (space) 0.707 (space) 0'''

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|  04:05
|  Press '''Enter'''. Leave some space

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| 04:09
|Open, close bracket

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|  04:10
|  Enter the co-ordinates for the  point 5

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| 04:13
|Enter ''' 0.353 (space) 0.353 (space) 0''', press '''Enter'''

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|04:22
| Now leave 4 vertical spaces and enter co-ordinates for point number 9

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|  04:27
| '''1 2 3 4 ,''' again press '''Enter''', leave some space 

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| 04:34
|Open, close bracket

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| 04:36
|  Enter '''0 (space) 1 (space) 0''', press '''Enter'''

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|  04:42
|   Leave some space

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| 04:44
|Enter '''co-ordinates''' for point number 10

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| 04:46
|  Open close bracket ''' 0 (space) 0.5 (space) 0''' and press '''Enter'''

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| 04:54
|  Similarly enter the co-ordinates for the remaining points in the geometry.

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| 05:00
|Insert a close bracket   put a''' semi-colon''' and press '''Enter'''

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| 05:05
|Again press '''Enter'''

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| 05:06
| Now type '''blocks''', press '''enter'''

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| 05:13
|Insert a open bracket  press '''enter'''

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| 05:16
| Let me switch back to the slides

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| 05:20
| The'''Block numbers''' are circled as shown in the figure

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|05:24
|Now let me switch back to the '''blockMeshDict file'''

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| 05:28
| Leave some space

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| 05:30
|Now enter the type of  block i.e. '''Hex''' leave some space

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|  05:37
|  Now enter the''' points''' for the '''blocks'''

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| 05:41
| Open, close brackets

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| 05:43
|Leave some space, the '''simple grading''' can be kept as '''(1 1 1) ''' and press enter

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|  05:55
| For creating the '''blocks''' please refer to the '''tutorial''' on '''creating simple geometry in OpenFOAM'''

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| 06:02
|Note that there will be more number of '''blocks''' in this example 

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| 06:07
|Now insert a close bracket

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| 06:10
|Insert a semi-colon, and  press '''Enter'''. Again press '''Enter'''

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| 06:16
| In the next line type '''edges''' and press '''Enter'''

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| 06:22
|insert a open bracket and press '''Enter'''

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|  06:26
|  Here you need to enter the '''points''' which are the end points of the arcs

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| 06:31
|Leave some space and type '''arc'''  leave some space type the points which are the end points of the arc

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| 06:40
|Let me switch back to the slide. Now insert the  end points of the arc

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| 06:46
|In this figure, we start with arc '''0 5'''

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| 06:52
|Let me switch back to the '''blockMeshDict file'''

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| 06:56
|Enter ''' 0 space 5'''

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| 06:59
| Leave some space insert open, close bracket

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|07:04
| In  the bracket  enter the co-ordinate of any '''intermediate''' point in between the two '''arc points'''.

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| 07:11
|Now let me switch back again to slides

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| 07:14
| In the figure you can see that you have to pick up a point  in between the two end  points of the arc.

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| 07:23
|In this geometry I have picked up '''right half''' of the circle 

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| 07:28
| Using '''simple geometric relations''' you can find the co-ordinates of the intermediate point as shown in the semi-circle

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| 07:38
| Similarly you can '''repeat''' the procedure for rest of the '''semi-circle geometry'''

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| 07:45
|Now  let me switch back to the '''blockMeshDict file'''

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| 07:48
| press '''Enter'''

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| 07:50
| Note that there are more number of arcs in this example

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| 07:55
| Insert a close bracket

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| 07:58
|Insert a semi -colon  press '''Enter''' again press '''Enter'''

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| 08:02
| Now enter the boundary patches after arcs

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| 08:06
|Refer to the tutorial on Simple geometry in '''OpenFOAM''', for entering the '''boundary patches'''

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| 08:12
| Enter '''boundary''',press '''Enter'''

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| 08:15
|Insert open bracket  press '''Enter'''. Insert close bracket  semi-colon, press '''Enter'''

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| 08:21
|Again press '''Enter'''

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| 08:24
| Now In the next line type '''mergePatchPairs'''

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| 08:29
|Note that '''P''' here is capital

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| 08:31
|  Press '''Enter'''

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| 08:33
|Insert a open bracket,  press '''Enter'''

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| 08:36
| Since there are '''no patches''' to be '''merged''' this can be kept empty

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| 08:40
|Insert a close bracket

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| 08:42
|Insert a '''semi -colon '''and press '''Enter'''

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| 08:46
|Let me switch back to the slides

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| 08:49
|Similarly enter the '''co-ordinate''' points for the points in the '''front face''' of unit thickness of the '''geometry''' as shown in the figure 

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| 08:57
| Now open a '''Command terminal'''

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| 09:00
| In the '''command terminal''' type the path for your case 

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| 09:04
| I have already set the path for the tutorial case of flow over cylinder

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| 09:10
|  In the '''terminal''' type '''blockMesh '''for '''meshing''' the geometry and press '''enter'''

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| 09:18
|'''Meshing''' is done

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|09:20
|Now type '''paraFoam''' in the '''terminal'''  and press  '''enter''' to view the geometry

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|09:26
| Let me drag this to the capture area

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| 09:30
| Now on  '''left-hand''' side of '''object inspector menu''' click '''Apply'''

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| 09:36
|  '''geometry''' will be created as seen in the '''paraview window'''

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| 09:41
| Scroll down the '''Object inspector menu'''

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|09:44
|  Check or uncheck the '''Mesh''' field box

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| 09:49
| You can see different regions of the geometry.

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| 09:53
|You can also see the''' wire frame '''of the geometry

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| 09:56
|On top of  the '''active variable control menu''',  in the drop down menu change from '''Surface''' to '''wireframe'''

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| 10:05
| You can see the '''wireframe model''' of the geometry

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| 10:11
|Close this. Let me switch back to the slides

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| 10:16
| In this tutorial we learnt:

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| 10:17
|How to create a curved geometry.

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| 10:20
|How to enter points for edges in '''OpenFOAM'''

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| 10:24
|This brings us to the end of the tutorial

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|10:28
| As an Assignment

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| 10:29
|Create a geometry with inner semi-circle of radius 2 meters and outer semi- circle of radius 4 meters  and View the geometry in '''paraview'''

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| 10:42
| Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial 

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| 10:45
|It summarizes the Spoken Tutorial project. 

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| 10:48
|If you do not have good bandwidth, you can download and watch it. 

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| 10:53
| The Spoken Tutorial Project Team

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| 10:56
|Conducts workshops using spoken tutorials

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| 10:58
|Gives certificates to those who pass an online test

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| 11:02
|For more details, please write to contact@spoken-tutorial.com

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|11:09
|Spoken Tutorials are part of Talk to a Teacher project, 

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| 11:13
|It is supported by the National Mission on Education through ICT, MHRD, Government of India. 

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| 11:18
|More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro

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| 11:23
|  This is Rahul Joshi from IIT BOMBAY signing off. Thanks for joining

|}