Learning Forum

[raranraez01]

Hello, I'm running a 3D simulation involving 25 million tetrahedra on a single cloud machine with 88 cores.

The issue is that the Surface Recovery process takes over a day due to the complexity of the geometry.

I would like to know how I can increase the computational power in the cloud to accelerate this process.

With an 88-core Intel Xeon machine and over 256 GB of RAM, the CPU usage is only at 1% (with 3 HPC packs), which leads me to believe it is using only a single core or operating in a single-threaded manner.

Is it possible to increase the power, or is simplifying the 3D surface the only solution?

[MirandaH]

Hi, meshing takes one core. It's a big project with 25m mesh elements, what is this application? Is there anyway to simplify the geometry?

[raranraez01]

Thank you for your reply. It's an electrostatic simulation of conductors and insulators, which perhaps has a lot of complex geometry, and indeed, reducing it can help a lot. However, I would also greatly appreciate your help because I cannot find documentation on the following matters:

1) The mesh refinement algorithm: how to simplify it, and if my geometry doesn't give a Parasolid error, how to get information on how the number of tetrahedrons can be reduced. I mean, knowing that you don't have sharp edges, splines, or sudden area changes.

2) Is it possible to divide the model into parts so that each part runs on a core if I have a powerful machine? Could the parts then be merged, and would Ansys understand how they are connected?

3) Can the simulation be sped up by removing the large mesh by another minor manually selected at the cost of error?

4) How can I get in touch with Ansys people to have a conversation about this?

[MirandaH]

Thanks for the additional info, there is an automatic mesh refinement for electrostatics solver and it refines mesh until the simulation converged or the max number of passes reaches. you can non-model some less important objects, like some geometry with materials that won't affect the electrostatics simulation.

You can use symmetry boundaries if this model has symmetry.

Yes, you can reduce mesh and speed up the simulation

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