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

• How to create a simple geometry
• How to view the geometry in ParaView

• Linux operating system Ubuntu 10.04
• OpenFOAM version 2.1.0
• ParaView version 3.12.0

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.

run>> tutorials >> incompressible>> icoFoam >>cavity

Let us take the Lid driven cavity case as an example.

I have already opened the command terminal and entered the path for lid driven cavity.

To source the OpenFOAM version 5, type:

$of5

To go to the run folder, type:

$cd $FOAM_RUN

To open the cavity case directory, type:

$cd tutorials/incompressible/icoFoam/cavity/cavity

To list the contents of case directory, type:

$ls

constant>>polyMesh

Geometry is inside the polymesh folder of constant.

In this there is another folder called as polymesh.

To list the contents of the cavity directory, type: $ls 0 constant system

To open the system directory, type: $cd system

To list the contents of the system directory, type:

$ls blockMeshDict controlDict fvSchemes fvSolution

Open the blockMeshDict file with any editor of your choice.

Note that M and D here are capital and press Enter.

Now minimise this.

Minimise the slide.

right click >create document>empty file

right click >create document>empty file

(Note that M and D here are capital)

upto convertToMeters

Paste

Now copy the data from the original lid driven cavity blockMeshDict file to the new blockMeshDict file from line 0.

Scroll up. line 0 upto convertTometers.

Copy this and paste it here.

Scroll down.

Now leave some space after convertTometers.

Type ; >> Enter

Enter

Insert a semi-colon and press Enter.

Again press Enter.

Enter >> Tab key

Press the Tab key.

Insert open close brackets.

Enter.

enter (1 0 0) >> Enter

(0 space 0 space 0) and press Enter.

Again press Tab key.

Open close bracket.

Move towards point 1 in positive x-axis and enter (1 space 0 space 0) and press Enter.

Move towards point 2 in the positive x-y plane and enter (1 space 1 space 0)

Press Enter.

Enter the 3rd point in positive y axis (0 space 1 space 0 )

Press Enter.

enter (0 0 0.1) >> Enter

Enter the 4th point on the front face.

Open close bracket. (0 space 0 space 0.1)

And press Enter.

Press Enter.

Again press Enter.

Lid driven cavity is a single block

Type blocks and press Enter.

Insert an open bracket and press Enter.

Note that Lid driven cavity is taken as a single block

Enter the vertices of block

hex (0 1 2 3 4 5 6 7 ) total 8 points

Enter the points for the blocks in the clockwise sense.

We are using here hexahedral blocks for meshing.

Now type hex H E X, leave some space, in brackets enter (0 space 1 space 2 space 3 space 4 space 5 space 6 space 7). Again leave some space.

Note that for multiple blocks the points will be more.

enter ( 30 30 1)

You can modify the grid as when needed.

insert ) and ;

Leave some space and 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.

As this is a simple geometry, edges can be kept empty.

Close the bracket, insert a semicolon and press Enter.

insert (

Insert an open bracket and press Enter.

Let me switch back to slides.

insert ;

Insert a semicolon and press Enter.

Insert open bracket, and press Enter. Press the tab key.

Open close bracket. In this bracket, enter the points for faces.

The curl can be clockwise or anticlockwise.

Now let me switch back to new blockMeshDict file.

insert } and ;

Let me switch back to the slide.

These are the points for the moving wall (3 7 6 2).

Minimize this. Note that you can start from any point on that face.

Now press Enter. Close the bracket.

You need to enter the semicolon.

After you insert the points for the faces again press Enter.

Close the curly bracket.

Another note - now after the curly brackets, press Enter. Again press Enter.

Refer to the figure in this slide for entering the points. Minimise this.

Insert the closed brackets and put a semicolon and press Enter. Again press Enter.

Since there are no patches to be merged, it can be kept empty.

Insert open close brackets and insert a semicolon. Again press Enter.

The complete blockMeshDict file is as shown here.

The command terminal will not work till blockMeshDict is closed

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

Now type cd space (dot) (dot) twice to return back to the cavity folder. Now mesh the geometry.

This will open the ParaView window.

Now let me switch back to the slides.

• Creating a simple geometry in OpenFOAM
• Viewed the geometry in ParaView

This brings us to the end of the tutorial.

• Change the dimensions of lid driven cavity.
• Change the grid size to (50 50 1).
• View the geometry in ParaView

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