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

• How to create a simple geometry
• How to view 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

Type gedit blockMeshDict

Open the blockMeshDict file with any editor of your choice.

In the terminal type gedit blockMeshDict.

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

Let me drag this to the capture area.

Now minimise this.

Minimise the slide.

right click >create document>empty file

right click > create document > Empty file

Name this as blockMeshDict.

(Note that M and D here are capital)

upto convertToMeters

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.

Enter 1 as the geometry is in meters.

Insert a semi-colon and press Enter.

Again press Enter.

type vertices

Press the Tab key.

(0 0 0) and move to positive x axis

enter (1 0 0)

Insert open close brackets.

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 (1 0 1)

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.

Let me switch back to the slides.

Note that Lid driven cavity is taken as a single block

block (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)

insert ) and ;

This is the grid spacing in the x,y and z direction.

Press enter, insert a close bracket and insert the semicolon and press enter. Again press enter.

insert (

insert a open bracket and press enter

Let me switch back to slides

insert ;

insert a semicolon and press enter.

Enter open and close brackets In brackets enter the points for faces

insert } and ;

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.

for front and back face can be kept as empty. Refer to figure in this slide for entering the points. Insert the closed brackets and put a semicolon. Again press enter. Again press enter.

The complete blockMeshDict file is as shown here.

The command terminal will not work till blockMeshDict is closed

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

Creating a simple geometry in OpenFOAM

Viewed the geometry in Paraview

This brings us to the end of the tutorial

Change the geometry parameters : Enter the grid points as (40 40 1) and (50 50 1).

View the geometry in paraview

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