[govind_IITD]

Hi All,

I am trying to simulate flow over sphere and meshing with snappyHexMesh. I have stl file for sphere. snappyhexMesh working fine and not getting error but desired mesh is not generating. I am attaching snappy.txt which is the mine input for snappyhexMeshDict.




Regards,
Govind Sharma
PhD, IIT Delhi

[simrego]

Hi!


Can you share your log file? Or give more details about the problem?
Your locationInMesh coordinate is correct?
If it is, try with locationInMesh (-2.899 0.11199 0.04499);
Make sure the point is not on an internal face.

[govind_IITD]

Originally Posted by simrego

Hi!


Can you share your log file? Or give more details about the problem?
Your locationInMesh coordinate is correct?
If it is, try with locationInMesh (-2.899 0.11199 0.04499);
Make sure the point is not on an internal face.

Thanks,

Here I have attached the output of snappyHexMesh. Also I am sharing the output of snappyHexMesh.

Govind

[simrego]

Hmm... Why do you have that much time directories?
make sure you check the last time directory with paraview, and you start snappy from the mesh resulted by blockMesh!



And now what is your problem exactly? (I see there are no layers, but I'm not sure if this is the only problem.)

I think you should increase the refinementLevel for the sphere. And you should have the sphere inside the refinement box. The layer generation in snappy can be really painful. For the first step try with only a few layers with the "relativeSizes true;" option.
Then you can increase it but don't worry if you won't be able to generate exactly the same mesh what you want. As I mentioned layer generation in snappy can be pretty painful!

[ssa_cfd]

Originally Posted by govind_IITD

Thanks,

Here I have attached the output of snappyHexMesh. Also I am sharing the output of snappyHexMesh.

Govind

I think your sphere is not inside the refinement box. Instead of using refinement box in snappy, use refinemeshdict and then run snappy.

[simrego]

refineMesh and snappy do nearly the same if you refine in 3D. But why should you use 2 utility when you can do everything in one?
Just correct the coordinates of the refinementBox and increase the refinementLevel of the sphere and you will be fine.