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

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|We will create a geometry for  flow over a cylinder.

|We will create a geometry for  flow over a cylinder.

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|Note that I am using this case just for explanation.

|Note that I am using this case just for explanation.

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|The cylinder is in the form of a semi circle.

|The cylinder is in the form of a semi circle.

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|'''Meshing''' is a body fitted grid.

|'''Meshing''' is a body fitted grid.

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|The entire geometry is divided into '''block'''s.

|The entire geometry is divided into '''block'''s.

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|We break the semi circle into equal number of parts.

|We break the semi circle into equal number of parts.

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|Now minimize this.

|Now minimize this.

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| Open a 'blockMeshDict' file of the previous tutorial.

| Open a 'blockMeshDict' file of the previous tutorial.

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|I have already opened it.

|I have already opened it.

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|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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|To do this, let us minimize this first.

|To do this, let us minimize this first.

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| Now, right-click > '''create document > empty file'''.

| Now, right-click > '''create document > empty file'''.

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| Name this as 'blockMeshDict'.

| Name this as 'blockMeshDict'.

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|Note that M and D here are capital.

|Note that M and D here are capital.

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|Open this.

|Open this.

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| 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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|Go up, copy this up to 'convertToMeters'.

|Go up, copy this up to 'convertToMeters'.

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| Copy this and paste it in the new 'blockMeshDict' file.

| Copy this and paste it in the new 'blockMeshDict' file.

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|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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| 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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| Now press '''Enter''' ,  press '''Enter''' again.

| Now press '''Enter''' ,  press '''Enter''' again.

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| 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.

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|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.

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| 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'''.

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| Insert the open bracket and press '''Enter'''.

| Insert the open bracket and press '''Enter'''.

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|  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.

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| Let me switch back to the slides.

| Let me switch back to the slides.

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|  For explanation, I will use right half of the semi-circle.

|  For explanation, I will use right half of the semi-circle.

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| Enter the values for the points in the figure starting from 0.

| Enter the values for the points in the figure starting from 0.

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|Let me switch back to the 'blockMeshDict' file.

|Let me switch back to the 'blockMeshDict' file.

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

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

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| Again leave some space , open close bracket.

| Again leave some space , open close bracket.

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|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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|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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| Leave some space and enter the co-ordinates for point number 4.

| Leave some space and enter the co-ordinates for point number 4.

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| 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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|  Press '''Enter'''. Leave some space.

|  Press '''Enter'''. Leave some space.

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|Enter '''0.353 (space) 0.353 (space) 0''', press '''Enter'''.

|Enter '''0.353 (space) 0.353 (space) 0''', press '''Enter'''.

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| 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.

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| 1 2 3 4 , again press '''Enter''', leave some space.  

| 1 2 3 4 , again press '''Enter''', leave some space.  

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|Open, close bracket.

|Open, close bracket.

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|  Enter '''0 (space) 1 (space) 0''', press '''Enter'''.

|  Enter '''0 (space) 1 (space) 0''', press '''Enter'''.

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|  Leave some space.

|  Leave some space.

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|Enter the co-ordinates for point number 10.

|Enter the co-ordinates for point number 10.

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|  Open close bracket ''' 0 (space) 0.5 (space) 0''' press '''Enter'''.

|  Open close bracket ''' 0 (space) 0.5 (space) 0''' press '''Enter'''.

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

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

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|Insert a close bracket  put a semi-colon and press '''Enter'''.

|Insert a close bracket  put a semi-colon and press '''Enter'''.

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|Insert an open bracket,  press '''Enter'''.

|Insert an open bracket,  press '''Enter'''.

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| Let me switch back to the slides

| Let me switch back to the slides

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| The '''block numbers''' are circled as shown in the figure.

| The '''block numbers''' are circled as shown in the figure.

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|Now let me switch back to the 'blockMeshDict file'.

|Now let me switch back to the 'blockMeshDict file'.

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| Leave some space.

| Leave some space.

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|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.

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|  Now enter the points for the blocks.

|  Now enter the points for the blocks.

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| Open, close brackets.

| Open, close brackets.

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| 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'''.

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|Note that there will be more number of '''blocks''' in this example.  

|Note that there will be more number of '''blocks''' in this example.  

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|Now, insert a close bracket.

|Now, insert a close bracket.

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

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

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| In the next line, type "edges" and press '''Enter'''.

| In the next line, type "edges" and press '''Enter'''.

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|Insert a open bracket and press '''Enter'''.

|Insert a open bracket and press '''Enter'''.

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|  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.

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|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.

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|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

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|In this figure, we start with arc '''0 5'''.

|In this figure, we start with arc '''0 5'''.

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|Let me switch back to the 'blockMeshDict file'.

|Let me switch back to the 'blockMeshDict file'.

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|Enter ''' 0 space 5'''.

|Enter ''' 0 space 5'''.

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| Leave some space. Insert open, close bracket.

| Leave some space. Insert open, close bracket.

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| 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.

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|Now, let me switch back again to slides.

|Now, let me switch back again to slides.

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| 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.

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|In this geometry, I have picked up right half of the circle.  

|In this geometry, I have picked up right half of the circle.  

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| 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.

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| 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.

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|Now, let me switch back to the 'blockMeshDict file'.

|Now, let me switch back to the 'blockMeshDict file'.

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| Press '''Enter'''.

| Press '''Enter'''.

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| Note that there are more number of arcs in this example.

| Note that there are more number of arcs in this example.

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| Insert a close bracket.

| Insert a close bracket.

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|Insert a semi -colon,  press '''Enter''', again press '''Enter'''.

|Insert a semi -colon,  press '''Enter''', again press '''Enter'''.

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| Now enter the '''boundary patche'''s after arcs.

| Now enter the '''boundary patche'''s after arcs.

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|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'''.

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| Enter "boundary", press '''Enter'''.

| Enter "boundary", press '''Enter'''.

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

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

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|Again press '''Enter'''.

|Again press '''Enter'''.

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| Now, in the next line, type "mergePatchPairs".

| Now, in the next line, type "mergePatchPairs".

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|Note that 'P' here is capital.

|Note that 'P' here is capital.

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|  Press '''Enter'''.

|  Press '''Enter'''.

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|Insert a open bracket,  press '''Enter'''.

|Insert a open bracket,  press '''Enter'''.

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| 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.

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|Insert a close bracket.

|Insert a close bracket.

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|Insert a semi colon and press '''Enter'''.

|Insert a semi colon and press '''Enter'''.

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|Let me switch back to the slides.

|Let me switch back to the slides.

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|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.  

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| Now, open a '''Command terminal'''.

| Now, open a '''Command terminal'''.

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| In the '''command terminal''', type the '''path''' for your case.  

| In the '''command terminal''', type the '''path''' for your case.  

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| 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'''.

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|  In the '''terminal''', type "blockMesh" for '''meshing''' the geometry and press '''Enter'''.

|  In the '''terminal''', type "blockMesh" for '''meshing''' the geometry and press '''Enter'''.

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|'''Meshing''' is done.

|'''Meshing''' is done.

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|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.

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| Let me drag this to the capture area.

| Let me drag this to the capture area.

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| Now on  left-hand side of '''object inspector menu''', click '''Apply'''.

| Now on  left-hand side of '''object inspector menu''', click '''Apply'''.

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|  Geometry will be created as seen in the '''paraview''' window.

|  Geometry will be created as seen in the '''paraview''' window.

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| Scroll down the '''Object inspector menu'''.

| Scroll down the '''Object inspector menu'''.

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|  Check or uncheck the '''Mesh''' field box.

|  Check or uncheck the '''Mesh''' field box.

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| You can see different regions of the geometry.

| You can see different regions of the geometry.

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|You can also see the''' wire frame '''of the geometry.

|You can also see the''' wire frame '''of the geometry.

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|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'''.

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| You can see the '''wireframe model''' of the geometry.

| You can see the '''wireframe model''' of the geometry.

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|Close this. Let me switch back to the slides.

|Close this. Let me switch back to the slides.

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|This brings us to the end of the tutorial.

|This brings us to the end of the tutorial.

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|-

| 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  

|-

|-

|It summarizes the Spoken Tutorial project.  

|It summarizes the Spoken Tutorial project.  

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|-

|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.  

|-

|-

| The Spoken Tutorial project team:

| The Spoken Tutorial project team:

|-

|-

|-

|-

|-

|-

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

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

|-

|-

|'''Spoken Tutorials''' are part of '''Talk to a Teacher''' project.  

|'''Spoken Tutorials''' are part of '''Talk to a Teacher''' project.  

|-

|-

|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.  

|-

|-

|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

|-

|-

|  This is Rahul Joshi from '''IIT Bombay''', signing off. Thanks for joining

|  This is Rahul Joshi from '''IIT Bombay''', signing off. Thanks for joining

|}

|}