[lilinghan8]

hi,

I would to add a cylinder(fixed) in the middle of a wave tank, how to do the mesh generation?
I learned from tutorial "flow around a cylinder" http://www.foamcfd.org/Nabla/guides/...Guidese12.html
and divided the tank into 20 blocks.

The first problem is about "inequality of cells number between neighbour blocks" I dont quite understand about how to set the red part of each block, the order or the numbers after it:

hex (4 9 10 5 23 28 29 24) (100 20 50) simpleGrading (1 1 1)

The second problem is after mesh generation (I just set all the numbers of cells in each direction equals the same) I use waveFOAM to generate wave and finally I got floating point exception issue, i am not sure if it is caused by wrong mesh generation, is there any way to solve it?

Regards,
Vricc

[kid]

Hi,

Would you like to take another approach of importing "cylinder.STL" file and meshing around it , instead of generating the way described in above link ? ( Mostly this is approach i take!! )

[lilinghan8]

Originally Posted by kid

Hi,

Would you like to take another approach of importing "cylinder.STL" file and meshing around it , instead of generating the way described in above link ? ( Mostly this is approach i take!! )

hi,

Thanks for ur reply,Could you link me a tutorial about your approach since I am fresh to cfd software and have no idea what is "cylinder.STL".

Many thanks
Vricc

[kid]

Ok
Do you have geometry modeling software.
"cylinder.stl" It is just a name , it can be a cylinder generated using geometry modeling software.
"xyz.stl" here stl is a format in which a given geometry could be imported in OpenFOAM.

So my question is again do u have modeling s/w?

[lilinghan8]

Originally Posted by kid

Ok
Do you have geometry modeling software.
"cylinder.stl" It is just a name , it can be a cylinder generated using geometry modeling software.
"xyz.stl" here stl is a format in which a given geometry could be imported in OpenFOAM.

So my question is again do u have modeling s/w?

No, I don't have any.

[kid]

Then get one .
"Salome" is a free-ware.
Then we can discuss.

Here is a image of your case generated in OpenFOAM.

[lilinghan8]

Originally Posted by kid

Then get one .
"Salome" is a free-ware.
Then we can discuss.

Here is a image of your case generated in OpenFOAM.

Thanks for your information,
Btw, could you send me the original file of this image and how to combine this with blockMeshDict in openfoam?

Regards,
Vricc

[kid]

@ llh
Yes, why not find a sample case.

Here
http://db.tt/Fsn0siFa

Note: make suitable changes for your case.

[lilinghan8]

Thanks again for you help

[lovecraft22]

Simple geometries such as this one can be also generated using paraview-->sources, then use the triangulate filter and then save data to save as a .stl

Anyway seems like you are having problems even with blockMesh, I would suggest you to read at least the first part of the openFoam manual before doing anything else…

[winden]

If you will be using snappyHexMesh to get the mesh around the cylinder you don't need an stl, just use searchableCylinder.

//Björn