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-   -   Geometry in OpenFoam (http://www.cfd-online.com/Forums/openfoam-pre-processing/118182-geometry-openfoam.html)

Mirage12 May 22, 2013 08:30

Geometry in OpenFoam
 
Hello everyone,

I am a new OpenFoam-user and have a lot of questions.... i read the User-guide...but still not understanding , how really openfoam works....

so...first of all .... i am interested on the geometry in OpenFoam:

I would like to understand, how OpenFoam builds the geometry..where can i find the information concerning the geometry, that i want to simulate ?
how can know....if my geometry is an air foil, a cylinder or a cavity ?

how can i import CAD-files into OpenFoam ? how can use geometries, that i drew using a CAD-software ? should i only use the stl format ?

Thanks a lot !!!!!

zhengzh5 May 23, 2013 13:59

Quote:

Originally Posted by Mirage12 (Post 429209)
Hello everyone,

I am a new OpenFoam-user and have a lot of questions.... i read the User-guide...but still not understanding , how really openfoam works....

so...first of all .... i am interested on the geometry in OpenFoam:

I would like to understand, how OpenFoam builds the geometry..where can i find the information concerning the geometry, that i want to simulate ?
how can know....if my geometry is an air foil, a cylinder or a cavity ?

how can i import CAD-files into OpenFoam ? how can use geometries, that i drew using a CAD-software ? should i only use the stl format ?

Thanks a lot !!!!!

hey,

OpenFOAM has 2 general approaches for building geometries: blockMesh and snappyHexMesh.

BlockMesh is typically used for simple geometries, you basicaly define points and builds blocks from them. You can read this for more detailed information. http://www.openfoam.org/docs/user/blockMesh.php

Other way to generate geometry in OpenFOAM is using snappyHexMesh, it takes a stl file as input, and there's various parameters to control the quality of the resultant mesh. for more detail, read this
http://www.openfoam.org/docs/user/snappyHexMesh.php
A tutorial on snappyHexMesh is located at /tutorials/mesh/snappyHexMesh/

That should get you going

Mirage12 May 24, 2013 00:05

thank you :)


but how can i import CAD-files into OpenFoam ? how can i use geometries, that i drew using a CAD-software ? should i only use the stl format ?

zhengzh5 May 24, 2013 00:11

Quote:

Originally Posted by Mirage12 (Post 429672)
thank you :)


but how can i import CAD-files into OpenFoam ? how can i use geometries, that i drew using a CAD-software ? should i only use the stl format ?

Yah, export your geometry into stl files, and use snappyHexMesh to generate the mesh. That will require a background mesh generated using blockmesh and a file called snappyHexMeshDict in the system directory. A sample snappyHexMeshDict can be found in the tutorial link I posted earlier.


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