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	The tutorials were recorded using the versions specified in previous slide. Subsequently the tutorials were edited to latest versions. To install latest system requirements go to Installation Sheet
00:37	We will create a geometry for flow over a cylinder.
00:41	Note that I am using this case just for explanation.
00:46	The cylinder is in the form of a semi circle.
00:50	Meshing is a body fitted grid.
00:54	The entire geometry is divided into blocks.
00:59	We break the semi circle into equal number of parts.
01:03	Now minimize this.
01:08	Open a 'blockMeshDict' file of the previous tutorial.
01:13	I have already opened it.
01:17	Scroll down. For simple geometries, you can see that edges is kept empty.
01:25	Now Create a new 'blockMeshDict' file.
01:28	To do this, let us minimize this first.
01:32	Now, right-click > create document > empty file.
01:39	Name this as 'blockMeshDict'.
01:45	Note that M and D here are capital.
01:51	Open this.
01:56	Now you can copy the initial few lines from the 'lid driven cavity' up to 'convertTometers'.
02:03	Go up, copy this up to 'convertToMeters'.
02:09	Copy this and paste it in the new 'blockMeshDict' file.
02:17	Now, change the 'convert to meters' from point one to one.
02:23	As our geometry is in meters, we will keep this as one.
02:29	Now press Enter , press Enter again.
02:33	After this, you need to enter the co-ordinates of the geometry in vertices.
02:40	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.
02:52	Minimize the slide. Now, type "vertices" in the 'blockMeshDict' file and press Enter.
03:01	Insert the open bracket and press Enter.
03:05	Now enter the co-ordinates of the geometry as shown in the diagram.
03:10	Let me switch back to the slides.
03:13	For explanation, I will use right half of the semi-circle.
03:17	Enter the values for the points in the figure starting from 0.
03:21	Let me switch back to the 'blockMeshDict' file.
03:25	Leave some space and enter the co-ordinates of point 0.
03:32	Open close bracket enter 0.5 (space) 0 (space) 0. Press Enter.
03:41	Again leave some space , open close bracket.
03:44	Enter the co-ordinates for point 1 (space) 0 (space) 0. Press Enter.
03:50	Now leave two vertical spaces, again press Enter, again press Enter.
03:56	Leave some space and enter the co-ordinates for point number 4.
04:02	Open close bracket, enter 0.707 (space) 0.707 (space) 0
04:10	Press Enter. Leave some space.
04:14	Open close bracket.Enter the co-ordinates for the point 5.
04:18	Enter 0.353 (space) 0.353 (space) 0, press Enter.
04:27	Now, leave 4 vertical spaces and enter co-ordinates for point number 9.
04:32	1 2 3 4 , again press Enter, leave some space.
04:37	Open, close bracket.
04:41	Enter 0 (space) 1 (space) 0, press Enter.
04:47	Leave some space.
04:48	Enter the co-ordinates for point number 10.
04:49	Open close bracket 0 (space) 0.5 (space) 0 press Enter.
04:57	Similarly enter the co-ordinates for the remaining points in the geometry.
05:03	Insert a close bracket put a semi-colon and press Enter.
05:08	Again press Enter.Now, type "blocks", press Enter.
05:16	Insert an open bracket, press Enter.
05:19	Let me switch back to the slides
05:23	The block numbers are circled as shown in the figure.
05:27	Now let me switch back to the 'blockMeshDict file'.
05:31	Leave some space.
05:33	Now enter the type of the block i.e. Hex, leave some space.
05:41	Now enter the points for the blocks.
05:46	Open, close brackets.
05:48	Leave some space, open close brackets, leave some space the simple Grading can be kept as (1 1 1) and press Enter.
06:04	For creating the blocks, please refer to the tutorial on creating simple geometry in OpenFOAM.
06:11	Note that there will be more number of blocks in this example.
06:16	Now, insert a close bracket.
06:19	Insert a semi-colon, and press Enter. Again press Enter.
06:25	In the next line, type "edges" and press Enter.
06:31	Insert a open bracket and press Enter.
06:35	Here you need to enter the points which are the end points of the arcs.
06:40	Leave some space and type "arc". Leave some space, type the points which are the end points of the arc.
06:49	Let me switch back to the slide. Now, insert the end points of the arc
06:55	In this figure, we start with arc 0 5.
07:02	Let me switch back to the 'blockMeshDict file'.
07:06	Enter 0 space 5.
07:09	Leave some space. Insert open, close bracket.
07:12	In the bracket, enter the co-ordinates of any intermediate point in between the two arc points.
07:20	Now, let me switch back again to slides.
07:23	In the figure, you can see that you have to pick up a point in between the two end points of the arc.
07:32	In this geometry, I have picked up right half of the circle.
07:37	Using simple geometric relations, you can find the co-ordinates of the intermediate points as shown in the semi-circle.
07:47	Similarly you can repeat the procedure for rest of the semi-circle geometry.
07:54	Now, let me switch back to the 'blockMeshDict file'.
07:57	Press Enter.
07:59	Note that there are more number of arcs in this example.
08:04	Insert a close bracket.
08:07	Insert a semi -colon, press Enter, again press Enter.
08:11	Now enter the boundary patches after arcs.
08:15	Refer to the tutorial on Simple geometry in OpenFOAM, for entering the boundary patches.
08:21	Enter "boundary", press Enter.
08:24	Insert open bracket press Enter. Insert close bracket semi-colon, press Enter.
08:30	Again press Enter.
08:35	Now, in the next line, type "mergePatchPairs".
08:38	Note that 'P' here is capital.
08:40	Press Enter.
08:43	Insert a open bracket, press Enter.
08:46	Since there are no patches to be merged, this can be kept empty.
08:48	Insert a close bracket.
08:50	Insert a semi colon and press Enter.
08:54	Let me switch back to the slides.
08:57	Similarly, enter the co-ordinate points for the points in the front face of unit thickness of the geometry as shown in the figure.
09:06	Now, open a Command terminal.
09:09	In the command terminal, type the path for your case.
09:13	I have already set the path for the tutorial case of flow over cylinder.
09:17	In the terminal, type "blockMesh" for meshing the geometry and press Enter.
09:25	Meshing is done.
09:33	Now, type "paraFoam" in the terminal and press Enter to view the geometry.
09:39	Let me drag this to the capture area.
09:43	Now on left-hand side of object inspector menu, click Apply.
09:49	Geometry will be created as seen in the paraview window.
09:54	Scroll down the Object inspector menu.
09:57	Check or uncheck the Mesh field box.
10:02	You can see different regions of the geometry.
10:06	You can also see the wire frame of the geometry.
10:09	On top of the active variable control menu, in the drop down menu, change from Surface to wireframe.
10:18	You can see the wireframe model of the geometry.
10:24	Close this. Let me switch back to the slides.
10:29	In this tutorial, we learnt:How to create a curved geometry.
10:33	How to enter points for edges in OpenFOAM.
10:37	This brings us to the end of the tutorial.
10:41	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.
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11:50	This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining

Contributors and Content Editors

DeepaVedartham, Gaurav, PoojaMoolya, Sandhya.np14, Sneha