Visualization of output for domains created with imported STL file

[manash.pb]

Hi all,
I am very new to OpenLB and LBM methods in general, so please excuse me if my question is too trivial.

I am simulating a flow through a 3d cylinder and the surface of the cylinder is imported through a STL file. When I write the output to VTK, the domain comes in the form of a parallelepiped (or in other words, the voxels outside the cylindrical STL surface, which are the ‘0’ voxels are also saved. Is there a way to exclude these cells while writing the VTK output, so that the ‘boundary’ of the cylinder is visible in the output data?

Thanks and regards,
Manash

[mathias]

Dear Manash,

you can use “thresholds” in paraview to exclude particular values.

Best
Mathias

[manash.pb]

Hi,
Thank you for your reply. Although ‘thresholding’ is a good idea to exclude data in Paraview, but the VTK data written to file has to contain a variable storing the voxel type (something like 1- fluid, 2- noslip, 0 – nothing), so that the thresholding in Paraview can be done on the basis of this variable. Is there a way to write to the VTK output data, the voxel type along with the other relevant hydrodynamic variables?

Manash

[mathias]

In allof the OpenLB examples a file “geometry” is written as vtk file, which you can be used for it.

[manash.pb]

Yes, that works!! Thank you very much!!

Manash

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