OpenFOAM/C2/Creating-curved-geometry-in-OpenFOAM/English-timed

Time	Narration
00:01	Hello and welcome to the spoken tutorial on Creating Curved geometry in OpenFOAM.
00:06	In this tutorial, I will show you:
00:09	Steps for creating a curved geometry in openfoam.
00:14	Viewing the results in paraview
00:17	To record this tutorial,
00:19	I am using: Linux Operating system Ubuntu version 10.04, OpenFOAM version 2.1.0
00:28	ParaView version 3.12.0.
00:32	We will create a geometry for flow over a cylinder.
00:36	Note that I am using this case just for explanation.
00:41	The cylinder is in the form of a semi circle.
00:45	Meshing is a body fitted grid.
00:49	The entire geometry is divided into blocks.
00:54	We break the semi circle into equal number of parts.
00:58	Now minimize this.
01:03	Open a 'blockMeshDict' file of the previous tutorial.
01:08	I have already opened it.
01:12	Scroll down. For simple geometries, you can see that edges is kept empty.
01:20	Now Create a new 'blockMeshDict' file.
01:23	To do this, let us minimize this first.
01:27	Now, right-click > create document > empty file.
01:34	Name this as 'blockMeshDict'.
01:40	Note that M and D here are capital.
01:46	Open this.
01:51	Now you can copy the initial few lines from the 'lid driven cavity' up to 'convertTometers'.
01:58	Go up, copy this up to 'convertToMeters'.
02:04	Copy this and paste it in the new 'blockMeshDict' file.
02:12	Now, change the 'convert to meters' from point one to one.
02:18	As our geometry is in meters, we will keep this as one.
02:24	Now press Enter , press Enter again.
02:28	After this, you need to enter the co-ordinates of the geometry in vertices.
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.
02:47	Minimize the slide. Now, type "vertices" in the 'blockMeshDict' file and press Enter.
02:56	Insert the open bracket and press Enter.
03:00	Now enter the co-ordinates of the geometry as shown in the diagram.
03:05	Let me switch back to the slides.
03:08	For explanation, I will use right half of the semi-circle.
03:12	Enter the values for the points in the figure starting from 0.
03:16	Let me switch back to the 'blockMeshDict' file.
03:20	Leave some space and enter the co-ordinates of point 0.
03:27	Open close bracket enter 0.5 (space) 0 (space) 0. Press Enter.
03:36	Again leave some space , open close bracket.
03:39	Enter the co-ordinates for point 1 (space) 0 (space) 0. Press Enter.
03:45	Now leave two vertical spaces, again press Enter, again press Enter.
03:51	Leave some space and enter the co-ordinates for point number 4.
03:57	Open close bracket, enter 0.707 (space) 0.707 (space) 0
04:05	Press Enter. Leave some space.
04:09	Open close bracket.Enter the co-ordinates for the point 5.
04:13	Enter 0.353 (space) 0.353 (space) 0, press Enter.
04:22	Now, leave 4 vertical spaces and enter co-ordinates for point number 9.
04:27	1 2 3 4 , again press Enter, leave some space.
04:34	Open, close bracket.
04:36	Enter 0 (space) 1 (space) 0, press Enter.
04:42	Leave some space.
04:44	Enter the co-ordinates for point number 10.
04:46	Open close bracket 0 (space) 0.5 (space) 0 press Enter.
04:54	Similarly enter the co-ordinates for the remaining points in the geometry.
05:00	Insert a close bracket put a semi-colon and press Enter.
05:05	Again press Enter.Now, type "blocks", press Enter.
05:13	Insert an open bracket, press Enter.
05:16	Let me switch back to the slides
05:20	The block numbers are circled as shown in the figure.
05:24	Now let me switch back to the 'blockMeshDict file'.
05:28	Leave some space.
05:30	Now enter the type of the block i.e. Hex, leave some space.
05:37	Now enter the points for the blocks.
05:41	Open, close brackets.
05:43	Leave some space, the simple Grading can be kept as (1 1 1) and press Enter.
05:55	For creating the blocks, please refer to the tutorial on creating simple geometry in OpenFOAM.
06:02	Note that there will be more number of blocks in this example.
06:07	Now, insert a close bracket.
06:10	Insert a semi-colon, and press Enter. Again press Enter.
06:16	In the next line, type "edges" and press Enter.
06:22	Insert a open bracket and press Enter.
06:26	Here you need to enter the points which are the end points of the arcs.
06:31	Leave some space and type "arc". Leave some space, type the points which are the end points of the arc.
06:40	Let me switch back to the slide. Now, insert the end points of the arc
06:46	In this figure, we start with arc 0 5.
06:52	Let me switch back to the 'blockMeshDict file'.
06:56	Enter 0 space 5.
06:59	Leave some space. Insert open, close bracket.
07:04	In the bracket, enter the co-ordinates of any intermediate point in between the two arc points.
07:11	Now, let me switch back again to slides.
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.
07:23	In this geometry, I have picked up right half of the circle.
07:28	Using simple geometric relations, you can find the co-ordinates of the intermediate points as shown in the semi-circle.
07:38	Similarly you can repeat the procedure for rest of the semi-circle geometry.
07:45	Now, let me switch back to the 'blockMeshDict file'.
07:48	Press Enter.
07:50	Note that there are more number of arcs in this example.
07:55	Insert a close bracket.
07:58	Insert a semi -colon, press Enter, again press Enter.
08:02	Now enter the boundary patches after arcs.
08:06	Refer to the tutorial on Simple geometry in OpenFOAM, for entering the boundary patches.
08:12	Enter "boundary", press Enter.
08:15	Insert open bracket press Enter. Insert close bracket semi-colon, press Enter.
08:21	Again press Enter.
08:24	Now, in the next line, type "mergePatchPairs".
08:29	Note that 'P' here is capital.
08:31	Press Enter.
08:33	Insert a open bracket, press Enter.
08:36	Since there are no patches to be merged, this can be kept empty.
08:40	Insert a close bracket.
08:42	Insert a semi colon and press Enter.
08:46	Let me switch back to the slides.
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.
08:57	Now, open a Command terminal.
09:00	In the command terminal, type the path for your case.
09:04	I have already set the path for the tutorial case of flow over cylinder.
09:10	In the terminal, type "blockMesh" for meshing the geometry and press Enter.
09:18	Meshing is done.
09:20	Now, type "paraFoam" in the terminal and press Enter to view the geometry.
09:26	Let me drag this to the capture area.
09:30	Now on left-hand side of object inspector menu, click Apply.
09:36	Geometry will be created as seen in the paraview window.
09:41	Scroll down the Object inspector menu.
09:44	Check or uncheck the Mesh field box.
09:49	You can see different regions of the geometry.
09:53	You can also see the wire frame of the geometry.
09:56	On top of the active variable control menu, in the drop down menu, change from Surface to wireframe.
10:05	You can see the wireframe model of the geometry.
10:11	Close this. Let me switch back to the slides.
10:16	In this tutorial, we learnt:How to create a curved geometry.
10:20	How to enter points for edges in OpenFOAM.
10:24	This brings us to the end of the tutorial.
10:28	As an Assignment-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.
10:42	Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
10:45	It summarizes the Spoken Tutorial project.
10:48	If you do not have good bandwidth, you can download and watch it.
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11:09	Spoken Tutorials are part of Talk to a Teacher project.
11:13	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
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11:23	This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining

Contributors and Content Editors

DeepaVedartham, Gaurav, PoojaMoolya, Sandhya.np14, Sneha