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

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|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.
 
|We will create a geometry for  flow over a cylinder.
  
 
|-
 
|-
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| 00:36
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| 00:41
 
|Note that I am using this case just for explanation.
 
|Note that I am using this case just for explanation.
  
 
|-
 
|-
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| 00:41
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| 00:46
 
|The cylinder is in the form of a semi circle.
 
|The cylinder is in the form of a semi circle.
  
 
|-
 
|-
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| 00:45
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| 00:50
 
|'''Meshing''' is a body fitted grid.
 
|'''Meshing''' is a body fitted grid.
  
 
|-
 
|-
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|00:49
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|00:54
 
|The entire geometry is divided into '''block'''s.
 
|The entire geometry is divided into '''block'''s.
  
 
|-
 
|-
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| 00:54
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| 00:59
 
|We break the semi circle into equal number of parts.
 
|We break the semi circle into equal number of parts.
  
 
|-
 
|-
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|00:58
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|01:03
 
|Now minimize this.
 
|Now minimize this.
  
 
|-
 
|-
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| 01:03
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| 01:08
 
| Open a 'blockMeshDict' file of the previous tutorial.
 
| Open a 'blockMeshDict' file of the previous tutorial.
  
 
|-
 
|-
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| 01:08
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| 01:13
 
|I have already opened it.
 
|I have already opened it.
  
 
|-
 
|-
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| 01:12
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| 01:17
 
|Scroll down. For simple geometries, you can see that  '''edges '''is kept empty.  
 
|Scroll down. For simple geometries, you can see that  '''edges '''is kept empty.  
  
 
|-
 
|-
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| 01:20
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| 01:25
 
| Now Create a new 'blockMeshDict' file.  
 
| Now Create a new 'blockMeshDict' file.  
  
 
|-
 
|-
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| 01:23
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| 01:28
 
|To do this, let us minimize this first.
 
|To do this, let us minimize this first.
  
 
|-
 
|-
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| 01:27
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| 01:32
 
| Now, right-click > '''create document > empty file'''.
 
| Now, right-click > '''create document > empty file'''.
  
 
|-
 
|-
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| 01:34
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| 01:39
 
| Name this as 'blockMeshDict'.
 
| Name this as 'blockMeshDict'.
  
 
|-
 
|-
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| 01:40
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| 01:45
 
|Note that M and D here are capital.
 
|Note that M and D here are capital.
  
 
|-
 
|-
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| 01:46
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| 01:51
 
|Open this.
 
|Open this.
  
 
|-
 
|-
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|  01:51
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|  01:56
 
| Now you can copy the initial few lines from the 'lid driven cavity' up to 'convertTometers'.
 
| Now you can copy the initial few lines from the 'lid driven cavity' up to 'convertTometers'.
  
 
|-
 
|-
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| 01:58
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| 02:03
 
|Go up, copy this up to 'convertToMeters'.
 
|Go up, copy this up to 'convertToMeters'.
  
 
|-
 
|-
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| 02:04
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| 02:09
 
| Copy this and paste it in the new 'blockMeshDict' file.
 
| Copy this and paste it in the new 'blockMeshDict' file.
  
 
|-
 
|-
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| 02:12
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| 02:17
 
|Now,  change the 'convert to meters' from point one to one.
 
|Now,  change the 'convert to meters' from point one to one.
  
 
|-
 
|-
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| 02:18
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| 02:23
 
| As our geometry is in meters, we will keep this as one.
 
| As our geometry is in meters, we will keep this as one.
  
 
|-
 
|-
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| 02:24
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| 02:29
 
| Now press '''Enter''' ,  press '''Enter''' again.
 
| Now press '''Enter''' ,  press '''Enter''' again.
  
 
|-
 
|-
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|02:28
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|02:33
 
| After this, you need to enter the co-ordinates of the  geometry in vertices.
 
| After this, you need to enter the co-ordinates of the  geometry in vertices.
  
 
|-
 
|-
−
| 02:35
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| 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.
 
|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
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|  02:52
 
| Minimize the slide. Now, type "vertices" in the 'blockMeshDict' file and press '''Enter'''.
 
| Minimize the slide. Now, type "vertices" in the 'blockMeshDict' file and press '''Enter'''.
  
 
|-
 
|-
−
|  02:56
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|  03:01
 
| Insert the open bracket and press '''Enter'''.
 
| Insert the open bracket and press '''Enter'''.
  
 
|-
 
|-
−
|  03:00
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|  03:05
 
|  Now enter the co-ordinates of the geometry as shown in the diagram.
 
|  Now enter the co-ordinates of the geometry as shown in the diagram.
  
 
|-
 
|-
−
|  03:05
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|  03:10
 
| Let me switch back to the slides.
 
| Let me switch back to the slides.
  
 
|-
 
|-
−
| 03:08
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| 03:13
 
|  For explanation, I will use right half of the semi-circle.
 
|  For explanation, I will use right half of the semi-circle.
  
 
|-
 
|-
−
|  03:12
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|  03:17
 
| Enter the values for the points in the figure starting from 0.
 
| Enter the values for the points in the figure starting from 0.
  
 
|-
 
|-
−
| 03:16
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| 03:21
 
|Let me switch back to the 'blockMeshDict' file.
 
|Let me switch back to the 'blockMeshDict' file.
  
 
|-
 
|-
−
|03:20
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|03:25
 
| Leave some space and enter the co-ordinates of point 0.
 
| Leave some space and enter the co-ordinates of point 0.
  
 
|-
 
|-
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|  03:27
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|  03:32
 
|  Open close bracket  enter '''0.5 (space) 0 (space) 0'''. Press '''Enter'''.
 
|  Open close bracket  enter '''0.5 (space) 0 (space) 0'''. Press '''Enter'''.
  
 
|-
 
|-
−
|  03:36
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|  03:41
 
| Again leave some space , open close bracket.
 
| Again leave some space , open close bracket.
  
 
|-
 
|-
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| 03:39
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| 03:44
 
|Enter the co-ordinates for point  '''1 (space) 0 (space) 0'''. Press '''Enter'''.
 
|Enter the co-ordinates for point  '''1 (space) 0 (space) 0'''. Press '''Enter'''.
  
 
|-
 
|-
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| 03:45
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| 03:50
 
|Now leave two vertical spaces, again  press '''Enter''', again  press '''Enter'''.
 
|Now leave two vertical spaces, again  press '''Enter''', again  press '''Enter'''.
 
    
 
    
 
|-
 
|-
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| 03:51
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| 03:56
 
| Leave some space and enter the co-ordinates for point number 4.
 
| Leave some space and enter the co-ordinates for point number 4.
  
 
|-
 
|-
−
| 03:57
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| 04:02
 
| Open close bracket, enter '''0.707 (space) 0.707 (space) 0'''
 
| Open close bracket, enter '''0.707 (space) 0.707 (space) 0'''
  
 
|-
 
|-
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|  04:05
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|  04:10
 
|  Press '''Enter'''. Leave some space.
 
|  Press '''Enter'''. Leave some space.
  
 
|-
 
|-
−
| 04:09
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| 04:14
 
|Open close bracket.Enter the co-ordinates for the  point 5.
 
|Open close bracket.Enter the co-ordinates for the  point 5.
  
 
|-
 
|-
−
| 04:13
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| 04:18
 
|Enter '''0.353 (space) 0.353 (space) 0''', press '''Enter'''.
 
|Enter '''0.353 (space) 0.353 (space) 0''', press '''Enter'''.
  
 
|-
 
|-
−
|04:22
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|04:27
 
| Now, leave 4 vertical spaces and enter co-ordinates for point number 9.
 
| Now, leave 4 vertical spaces and enter co-ordinates for point number 9.
  
 
|-
 
|-
−
| 04:27
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| 04:32
 
| 1 2 3 4 , again press '''Enter''', leave some space.  
 
| 1 2 3 4 , again press '''Enter''', leave some space.  
  
 
|-
 
|-
−
| 04:34
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| 04:37
 
|Open, close bracket.
 
|Open, close bracket.
  
 
|-
 
|-
−
| 04:36
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| 04:41
 
|  Enter '''0 (space) 1 (space) 0''', press '''Enter'''.
 
|  Enter '''0 (space) 1 (space) 0''', press '''Enter'''.
  
 
|-
 
|-
−
|  04:42
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|  04:47
 
|  Leave some space.
 
|  Leave some space.
  
 
|-
 
|-
−
| 04:44
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| 04:48
 
|Enter the co-ordinates for point number 10.
 
|Enter the co-ordinates for point number 10.
  
 
|-
 
|-
−
| 04:46
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| 04:49
 
|  Open close bracket ''' 0 (space) 0.5 (space) 0''' press '''Enter'''.
 
|  Open close bracket ''' 0 (space) 0.5 (space) 0''' press '''Enter'''.
  
 
|-
 
|-
−
| 04:54
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| 04:57
 
|  Similarly enter the co-ordinates for the remaining points in the geometry.
 
|  Similarly enter the co-ordinates for the remaining points in the geometry.
  
 
|-
 
|-
−
| 05:00
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| 05:03
 
|Insert a close bracket  put a semi-colon and press '''Enter'''.
 
|Insert a close bracket  put a semi-colon and press '''Enter'''.
  
 
|-
 
|-
−
| 05:05
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| 05:08
 
|Again press '''Enter'''.Now, type "blocks", press '''Enter'''.
 
|Again press '''Enter'''.Now, type "blocks", press '''Enter'''.
  
 
|-
 
|-
−
| 05:13
+
| 05:16
 
|Insert an open bracket,  press '''Enter'''.
 
|Insert an open bracket,  press '''Enter'''.
  
 
|-
 
|-
−
| 05:16
+
| 05:19
 
| Let me switch back to the slides
 
| Let me switch back to the slides
  
 
|-
 
|-
−
| 05:20
+
| 05:23
 
| The '''block numbers''' are circled as shown in the figure.
 
| The '''block numbers''' are circled as shown in the figure.
  
 
|-
 
|-
−
|05:24
+
|05:27
 
|Now let me switch back to the 'blockMeshDict file'.
 
|Now let me switch back to the 'blockMeshDict file'.
  
 
|-
 
|-
−
| 05:28
+
| 05:31
 
| Leave some space.
 
| Leave some space.
  
 
|-
 
|-
−
| 05:30
+
| 05:33
 
|Now enter the type of  the '''block''' i.e. '''Hex''', leave some space.
 
|Now enter the type of  the '''block''' i.e. '''Hex''', leave some space.
  
 
|-
 
|-
−
|  05:37
+
|  05:41
 
|  Now enter the points for the blocks.
 
|  Now enter the points for the blocks.
  
 
|-
 
|-
−
| 05:41
+
| 05:46
 
| Open, close brackets.
 
| Open, close brackets.
  
 
|-
 
|-
−
| 05:43
+
| 05:48
−
|Leave some space, the '''simple Grading''' can be kept as '''(1 1 1) ''' and press '''Enter'''.
+
|Leave some space, open close brackets, leave some space the '''simple Grading''' can be kept as '''(1 1 1) ''' and press '''Enter'''.
  
 
|-
 
|-
−
|  05:55
+
|  06:04
 
| For creating the '''blocks''', please refer to the tutorial on '''creating simple geometry in OpenFOAM'''.
 
| For creating the '''blocks''', please refer to the tutorial on '''creating simple geometry in OpenFOAM'''.
  
 
|-
 
|-
−
| 06:02
+
| 06:11
 
|Note that there will be more number of '''blocks''' in this example.  
 
|Note that there will be more number of '''blocks''' in this example.  
  
 
|-
 
|-
−
| 06:07
+
| 06:16
 
|Now, insert a close bracket.
 
|Now, insert a close bracket.
  
 
|-
 
|-
−
| 06:10
+
| 06:19
 
|Insert a semi-colon, and  press '''Enter'''. Again press '''Enter'''.
 
|Insert a semi-colon, and  press '''Enter'''. Again press '''Enter'''.
  
 
|-
 
|-
−
| 06:16
+
| 06:25
 
| In the next line, type "edges" and press '''Enter'''.
 
| In the next line, type "edges" and press '''Enter'''.
  
 
|-
 
|-
−
| 06:22
+
| 06:31
 
|Insert a open bracket and press '''Enter'''.
 
|Insert a open bracket and press '''Enter'''.
  
 
|-
 
|-
−
|  06:26
+
|  06:35
 
|  Here you need to enter the points which are the end points of the arcs.
 
|  Here you need to enter the points which are the end points of the arcs.
  
 
|-
 
|-
−
| 06:31
+
| 06:40
 
|Leave some space and type "arc". Leave some space, type the points which are the end points of the arc.
 
|Leave some space and type "arc". Leave some space, type the points which are the end points of the arc.
  
 
|-
 
|-
−
| 06:40
+
| 06:49
 
|Let me switch back to the slide. Now, insert the  end points of the arc
 
|Let me switch back to the slide. Now, insert the  end points of the arc
  
 
|-
 
|-
−
| 06:46
+
| 06:55
 
|In this figure, we start with arc '''0 5'''.
 
|In this figure, we start with arc '''0 5'''.
  
 
|-
 
|-
−
| 06:52
+
| 07:02
 
|Let me switch back to the 'blockMeshDict file'.
 
|Let me switch back to the 'blockMeshDict file'.
  
 
|-
 
|-
−
| 06:56
+
| 07:06
 
|Enter ''' 0 space 5'''.
 
|Enter ''' 0 space 5'''.
  
 
|-
 
|-
−
| 06:59
+
| 07:09
 
| Leave some space. Insert open, close bracket.
 
| Leave some space. Insert open, close bracket.
  
 
|-
 
|-
−
|07:04
+
|07:12
 
| In  the bracket,  enter the co-ordinates of any intermediate point in between the two arc points.
 
| In  the bracket,  enter the co-ordinates of any intermediate point in between the two arc points.
  
 
|-
 
|-
−
| 07:11
+
| 07:20
 
|Now, let me switch back again to slides.
 
|Now, let me switch back again to slides.
  
 
|-
 
|-
−
| 07:14
+
| 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.
 
| 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
+
| 07:32
 
|In this geometry, I have picked up right half of the circle.  
 
|In this geometry, I have picked up right half of the circle.  
  
 
|-
 
|-
−
| 07:28
+
| 07:37
 
| Using simple geometric relations, you can find the co-ordinates of the intermediate points as shown in the semi-circle.
 
| Using simple geometric relations, you can find the co-ordinates of the intermediate points as shown in the semi-circle.
  
 
|-
 
|-
−
| 07:38
+
| 07:47
 
| Similarly you can repeat the procedure for rest of the semi-circle geometry.
 
| Similarly you can repeat the procedure for rest of the semi-circle geometry.
  
 
|-
 
|-
−
| 07:45
+
| 07:54
 
|Now, let me switch back to the 'blockMeshDict file'.
 
|Now, let me switch back to the 'blockMeshDict file'.
  
 
|-
 
|-
−
| 07:48
+
| 07:57
 
| Press '''Enter'''.
 
| Press '''Enter'''.
  
 
|-
 
|-
−
| 07:50
+
| 07:59
 
| Note that there are more number of arcs in this example.
 
| Note that there are more number of arcs in this example.
  
 
|-
 
|-
−
| 07:55
+
| 08:04
 
| Insert a close bracket.
 
| Insert a close bracket.
  
 
|-
 
|-
−
| 07:58
+
| 08:07
 
|Insert a semi -colon,  press '''Enter''', again press '''Enter'''.
 
|Insert a semi -colon,  press '''Enter''', again press '''Enter'''.
  
 
|-
 
|-
−
| 08:02
+
| 08:11
 
| Now enter the '''boundary patche'''s after arcs.
 
| Now enter the '''boundary patche'''s after arcs.
  
 
|-
 
|-
−
| 08:06
+
| 08:15
 
|Refer to the tutorial on '''Simple geometry in OpenFOAM''', for entering the '''boundary patches'''.
 
|Refer to the tutorial on '''Simple geometry in OpenFOAM''', for entering the '''boundary patches'''.
  
 
|-
 
|-
−
| 08:12
+
| 08:21
 
| Enter "boundary", press '''Enter'''.
 
| Enter "boundary", press '''Enter'''.
  
 
|-
 
|-
−
| 08:15
+
| 08:24
 
|Insert open bracket  press '''Enter'''. Insert close bracket  semi-colon, press '''Enter'''.
 
|Insert open bracket  press '''Enter'''. Insert close bracket  semi-colon, press '''Enter'''.
  
 
|-
 
|-
−
| 08:21
+
| 08:30
 
|Again press '''Enter'''.
 
|Again press '''Enter'''.
  
 
|-
 
|-
−
| 08:24
+
| 08:35
 
| Now, in the next line, type "mergePatchPairs".
 
| Now, in the next line, type "mergePatchPairs".
  
 
|-
 
|-
−
| 08:29
+
| 08:38
 
|Note that 'P' here is capital.
 
|Note that 'P' here is capital.
  
 
|-
 
|-
−
| 08:31
+
| 08:40
 
|  Press '''Enter'''.
 
|  Press '''Enter'''.
  
 
|-
 
|-
−
| 08:33
+
| 08:43
 
|Insert a open bracket,  press '''Enter'''.
 
|Insert a open bracket,  press '''Enter'''.
  
 
|-
 
|-
−
| 08:36
+
| 08:46
 
| Since there are no '''patches''' to be merged, this can be kept empty.
 
| Since there are no '''patches''' to be merged, this can be kept empty.
  
 
|-
 
|-
−
| 08:40
+
| 08:48
 
|Insert a close bracket.
 
|Insert a close bracket.
  
 
|-
 
|-
−
| 08:42
+
| 08:50
 
|Insert a semi colon and press '''Enter'''.
 
|Insert a semi colon and press '''Enter'''.
  
 
|-
 
|-
−
| 08:46
+
| 08:54
 
|Let me switch back to the slides.
 
|Let me switch back to the slides.
  
 
|-
 
|-
−
| 08:49
+
| 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.  
 
|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
+
| 09:06
 
| Now, open a '''Command terminal'''.
 
| Now, open a '''Command terminal'''.
  
 
|-
 
|-
−
| 09:00
+
| 09:09
 
| In the '''command terminal''', type the '''path''' for your case.  
 
| In the '''command terminal''', type the '''path''' for your case.  
  
 
|-
 
|-
−
| 09:04
+
| 09:13
 
| I have already set the '''path''' for the tutorial case of '''flow over cylinder'''.
 
| I have already set the '''path''' for the tutorial case of '''flow over cylinder'''.
  
 
|-
 
|-
−
| 09:10
+
| 09:17
 
|  In the '''terminal''', type "blockMesh" for '''meshing''' the geometry and press '''Enter'''.
 
|  In the '''terminal''', type "blockMesh" for '''meshing''' the geometry and press '''Enter'''.
  
 
|-
 
|-
−
| 09:18
+
| 09:25
 
|'''Meshing''' is done.
 
|'''Meshing''' is done.
  
 
|-
 
|-
−
|09:20
+
|09:33
 
|Now, type "paraFoam" in the '''terminal'''  and press  '''Enter''' to view the geometry.
 
|Now, type "paraFoam" in the '''terminal'''  and press  '''Enter''' to view the geometry.
  
 
|-
 
|-
−
|09:26
+
|09:39
 
| Let me drag this to the capture area.
 
| Let me drag this to the capture area.
  
 
|-
 
|-
−
| 09:30
+
| 09:43
 
| Now on  left-hand side of '''object inspector menu''', click '''Apply'''.
 
| Now on  left-hand side of '''object inspector menu''', click '''Apply'''.
  
 
|-
 
|-
−
| 09:36
+
| 09:49
 
|  Geometry will be created as seen in the '''paraview''' window.
 
|  Geometry will be created as seen in the '''paraview''' window.
  
 
|-
 
|-
−
| 09:41
+
| 09:54
 
| Scroll down the '''Object inspector menu'''.
 
| Scroll down the '''Object inspector menu'''.
  
 
|-
 
|-
−
|09:44
+
|09:57
 
|  Check or uncheck the '''Mesh''' field box.
 
|  Check or uncheck the '''Mesh''' field box.
  
 
|-
 
|-
−
| 09:49
+
| 10:02
 
| You can see different regions of the geometry.
 
| You can see different regions of the geometry.
  
 
|-
 
|-
−
| 09:53
+
| 10:06
 
|You can also see the''' wire frame '''of the geometry.
 
|You can also see the''' wire frame '''of the geometry.
  
 
|-
 
|-
−
| 09:56
+
| 10:09
 
|On top of  the '''active variable control menu''',  in the drop down menu, change from '''Surface''' to '''wireframe'''.
 
|On top of  the '''active variable control menu''',  in the drop down menu, change from '''Surface''' to '''wireframe'''.
  
 
|-
 
|-
−
| 10:05
+
| 10:18
 
| You can see the '''wireframe model''' of the geometry.
 
| You can see the '''wireframe model''' of the geometry.
  
 
|-
 
|-
−
| 10:11
+
| 10:24
 
|Close this. Let me switch back to the slides.
 
|Close this. Let me switch back to the slides.
  
 
|-
 
|-
−
| 10:16
+
| 10:29
 
| In this tutorial, we learnt:How to create a curved geometry.
 
| In this tutorial, we learnt:How to create a curved geometry.
  
 
|-
 
|-
−
| 10:20
+
| 10:33
 
|How to enter points for edges in '''OpenFOAM'''.
 
|How to enter points for edges in '''OpenFOAM'''.
  
 
|-
 
|-
−
| 10:24
+
| 10:37
 
|This brings us to the end of the tutorial.
 
|This brings us to the end of the tutorial.
  
 
|-
 
|-
−
|10:28
+
|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'''.
 
| 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
+
| 10:55
 
| Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial  
 
| Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial  
  
 
|-
 
|-
−
| 10:45
+
| 10:58
 
|It summarizes the Spoken Tutorial project.  
 
|It summarizes the Spoken Tutorial project.  
  
 
|-
 
|-
−
| 10:48
+
| 11:01
 
|If you do not have good bandwidth, you can download and watch it.  
 
|If you do not have good bandwidth, you can download and watch it.  
  
 
|-
 
|-
−
| 10:53
+
| 11:06
 
| The Spoken Tutorial project team:
 
| The Spoken Tutorial project team:
  
 
|-
 
|-
−
| 10:56
+
| 11:09
 
| Conducts workshops using spoken tutorials
 
| Conducts workshops using spoken tutorials
  
 
|-
 
|-
−
| 10:58
+
| 11:11
 
| Gives certificates to those who pass an online test.
 
| Gives certificates to those who pass an online test.
  
 
|-
 
|-
−
| 11:02
+
| 11:15
 
|For more details, please write to: '''contact@spoken-tutorial.com'''
 
|For more details, please write to: '''contact@spoken-tutorial.com'''
  
 
|-
 
|-
−
|11:09
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|'''Spoken Tutorials''' are part of '''Talk to a Teacher''' project.  
 
|'''Spoken Tutorials''' are part of '''Talk to a Teacher''' project.  
  
 
|-
 
|-
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| 11:13
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| 11:40
 
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
 
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
  
 
|-
 
|-
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| 11:18
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|More information on this mission is available at this  link:
 
|More information on this mission is available at this  link:
 
http://spoken-tutorial.org/NMEICT-Intro
 
http://spoken-tutorial.org/NMEICT-Intro
  
 
|-
 
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|  This is Rahul Joshi from '''IIT Bombay''', signing off. Thanks for joining
 
|  This is Rahul Joshi from '''IIT Bombay''', signing off. Thanks for joining
  
 
|}
 
|}

Latest revision as of 11:51, 11 April 2019

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.
10:55 Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
10:58 It summarizes the Spoken Tutorial project.
11:01 If you do not have good bandwidth, you can download and watch it.
11:06 The Spoken Tutorial project team:
11:09 Conducts workshops using spoken tutorials
11:11 Gives certificates to those who pass an online test.
11:15 For more details, please write to: contact@spoken-tutorial.com
11:38 Spoken Tutorials are part of Talk to a Teacher project.
11:40 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
11:45 More information on this mission is available at this link:

http://spoken-tutorial.org/NMEICT-Intro

11:50 This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining

Contributors and Content Editors

DeepaVedartham, Gaurav, PoojaMoolya, Sandhya.np14, Sneha

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