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 cylinder.
00:36	Note that I am using this case just for explanation.
00:41	The cylinder is in a 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 minimise 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 minimise 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 upto convertTometers
01:58	Go up copy this upto 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	Minimise 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 a 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 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-ordinate 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
04:10	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 co-ordinates for point number 10
04:46	Open close bracket 0 (space) 0.5 (space) 0 and 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
05:06	Now type blocks, press enter
05:13	Insert a open bracket press enter
05:16	Let me switch back to the slides
05:20	TheBlock 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 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 we get, 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-ordinate 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 point 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 file
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:
10:17	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
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
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.
10:53	The Spoken Tutorial Project Team
10:56	Conducts workshops using spoken tutorials
10:58	Gives certificates to those who pass an online test
11:02	For more details, please write to contact@spoken-tutorial.com
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.
11:18	More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro
11:23	This is Rahul Joshi from IIT BOMBAY signing off. Thanks for joining

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DeepaVedartham, Gaurav, PoojaMoolya, Sandhya.np14, Sneha