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

|In '''brackets''' open close brakets enter '''30 space 30 space 1''' leave some space , you can  modify the '''grid'''  as an when needed  

|'''Grid point''' in '''z-axis''' can be taken as one  

|Now leave some space and type '''simple grading'''  leave some space open close bracket enter '''1 space 1 space 1 '''

| This is the grid spacing in the x y and z direction. Press  '''Enter'''

| Insert close '''bracket''',   insert a '''semicolon''' and press  '''Enter'''

| Again press '''Enter'''. Now type '''edges''', and press  '''Enter'''

|  As this is a simple geometry edges can be kept empty  

|  Insert  open  bracket press  '''Enter''',  close the  bracket ,insert a semicolon and press  '''Enter'''

| Here you need to enter the '''boundary name''' for the '''faces'''

|Type '''boundary''' and  press '''Enter''' .  

|insert a open bracket and press  '''Enter'''

|Now let me switch back to the slides  

|In the geometry the upper wall is moving and other three walls are fixed.  

| The front and back faces are named as '''empty''' as this is a 2D problem

| Open the new '''blockMeshDict''' file again

| In '''boundary''' put the name of the '''patch''' as '''moving wall''' . Press  '''Enter'''

| Now Insert a open curly bracket and press  '''Enter'''

| Now enter the '''type''' for the '''moving wall''' , enter '''type''' space  '''wall'''   

| insert a '''semicolon''' and press  '''Enter'''

|Now insert open bracket, and press '''Enter'''. Press the tab key. Open close bracket.

|In this bracket enter the pointfor for faces

|Let me switch to the slide

| Note that order of the points  should be in such a way that the '''thumb''' should be '''normal''' to the '''face '''

| And fingers making a  curl  as shown in the figure .

|The curl can be clockwise or anti- clockwise  

| Also note that the points should match with the points inserted in vertices

|Now let me switch back to the new '''blockmeshdict''' file .

|Now in the faces enter '''3 space 7 space 6 space 2'''.

|  Let me switch back to the slide. These are the point for the moving wall 3,7,6,2.

|Minimise this. Note that you can start from any point on that face. Now press  '''Enter'''

|Close the bracket again press  '''Enter'''. Close the curly bracket.

|Another note we need to enter a semi- colon, after you insert the points, a faces now after the curly brackets, press  '''Enter''' again press  '''Enter'''

|Now similarly enter '''boundary condition''' and '''faces''' for the '''fixed wall '''

| Being a 2D problem the type of boundary for front and back face can be kept as empty.

|Refer to the figure in the slide. For entering the points. Minimise this

| Insert   the closed brackets,  put a '''semicolon''' and press  '''Enter''',  again press  '''Enter'''

|Now type '''mergePatchPairs''' and press  '''Enter'''

| Since their are no patches to merge it can be kept empty

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

| We are done with creating the  '''blockmeshdict''' file. Save this    

| The complete''' blockMeshDict '''file is as shown here.  

| Close  '''both the blockMeshDict''' files

| Note that the '''command terminal''' will not work until '''blockMeshDict file''' is '''closed'''

|  Switch back to the terminal. Now type '''cd (dot) (dot)''' twice to return back to the '''cavity''' folder. Now '''Mesh the geometry'''  

|To do this in  a '''terminal''' type: '''blockMesh''' and press  '''Enter'''

|Now View the '''geometry''' by typing in the '''command terminal''' '''paraFoam''' and press  '''Enter'''

| This will open the ''' ParaView window'''

| Now On the left hand side click '''Apply''' on '''object inspector menu''' thus you can see the geometry.

| Now let me switch back to  the slides

|  In this tutorial we learnt:  

| Creating a simple geometry in '''OpenFOAM'''  

| Viewing the '''geometry''' in '''Paraview '''

| This brings us to the end of the tutorial  

| As an Assignment  

| Change the direction  of '''lid driven cavity''' ,Change the '''grid size''' to '''50 50 1'''and View the geometry in '''paraview'''  

| Watch the video available at this URL: [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http://spoken-][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial tutorial.org/What_is_a_Spoken_Tutorial]

| The Spoken Tutorial Project Team

| -Conducts workshops using spoken tutorials  

| -Gives certificates to those who pass an online test  

| -For more details, please write to contact@spoken-tutorial.org  

|  Spoken Tutorial project is part of Talk to a Teacher project,

| More information on the same is available at the following URL 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.