Unable to simulate airflow

I am trying to compare the airflow of two potential designs, neither of which is complicated.
These screenshots are of sections from a larger assembly.
These sections are only ~25% the size of the full assembly.
The geometry shown is the air volume around the material with 12" of space on either side of the geometry being tested.

Design 1 - “Louvers”

Failed to complete, simply timing out after 5.5 hours. I would have gladly let the simulation continue running, but it auto-canceled rather then allowing me the option of expending the time required.

After rerunning with a time out of ~10x the default simulation time, the simulation failed with a “divergence” error.

Geometry:
Valid polysurface.
closed solid polysurface with 1635 surfaces.
Edge Tally:
3645 manifold edges
Edge Tolerances: 0 to 0.00776457
median = 0 average = 5.30483e-05
Vertex Tolerances: 0 to 0.00777234
median = 0 average = 4.85417e-05
Render mesh: 1635 meshes 59387 vertices 53718 polygons
Created with quality meshing parameters.
Analysis mesh: none present

Design 2 - “Mesh”

For this design I have not even been able to complete the upload step.


Geometry:
Valid polysurface.
closed solid polysurface with 7683 surfaces.
Edge Tally:
7119 seam edges
16430 manifold edges
= 23549 total edges
Edge Tolerances: 0 to 0.0167974
median = 0 average = 0.000147589
Vertex Tolerances: 0 to 0.00997248
median = 0 average = 5.62939e-05
Render mesh: 7683 meshes 1834892 vertices 1383917 polygons
Created with quality meshing parameters.
Analysis mesh: none present

Thus far I have been unable to complete a simulation of either of these designs.

While I was able to complete a smaller 12"x12" sample of each design those tests yielded to little data to be representative of the larger assembly.

Hi @mgarito, thanks for posting on the forum :slight_smile:

As your simulation contains many details, it innevitably will require a large mesh to be simulated and will take a lot of computing resources to be completed.

Regarding the divergence issue, it might have to do with your mesh’s overall quality. Here are some helpful resources on that:

If you only want to evaluate the pressure drop these holes generate, an option would be for you to apply a porous media instead.

If you want us to take a closer look at your project, please share its URL here!

Best,
Igor