Dear Experts,
I have a voxelized 3D model. I’d like to insert spherical geometry using an SPH card, which will contain some voxels. Is this possible?
I read in a post from a year ago that it wasn’t easy to do. Has anything changed?
Any suggestions would be very helpful.
Dear Andrea,
It is still not possible to combine the Voxel and combinatorial geometry.
Cheers,
David
Thanks for the update, David.
Given this limitation, is there any other way to simulate a spherical inclusion within a voxelized volume? Perhaps by post-processing the geometry or using a specific user routine?
Best regards,
Andrea
Dear Andrea,
There are two ways - one is fast but risky in terms of results (~10 % difference in energy balance is observed against CSG geometry), and the second is more precise, but also more complex.
You can replicate a spherical inclusion by using FLUKA LATTICE functionality, where the replica region contains a void filled with the required material:
You should post-process your geometry by converting it into Abaqus mesh format, where each voxel will be represented by a hexahedral element. For your voxel grid of n_x \times n_y \times n_z, the maximum possible number of nodes is (n_x + 1) \times (n_y + 1) \times (n_z + 1). Nodes’ positions must be calculated according to the resolution. The hardest part is splitting voxel groups into regions and associating elements inside with the correct nodes` indices. Thus, after loading this mesh, boolean operations of CSG bodies are allowed with the UMESH cage region. Material assignment should be done manually, unlike for voxels (by means of a script). RECOMMENDED and guaranteed to match CSG equivalent.
Best regards,
Volodymyr
