"Velocity field started diverging"

Project Support
1

Hello, I had an error when starting an incompressible flow simulation and I’m not really sure what to do.

The message states:

Velocity field started diverging. Please check the mesh quality near the reported location and try refining the mesh. If the problem occured near a boundary, please check the boundary conditions. In case of doubt, please ask for assistance via our support chat. Velocity = 8.89335e+07 at position: (0.009443 m, -0.1165 m, 0.01844 m).

Here is the link to my project: SimScale Login
(Incompressible 3, Run 1)

Thank you and help would be extremely helpful.

2

Perhaps the following article will help troubleshoot the issue further. Note at the bottom of the article, there are two workarounds to try: Divergence in Simulation: How to Tell When and Where? | SimScale

The above article also directs to another article that gives further details on how to check and improve mesh quality: How to Check and Improve Mesh Quality | SimScale

3

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

@nelta provided some good resources to diagnose and solve the divergence problem within your model. Indeed, when you take a look at the volume ratio for instance, you’ll see that it falls way outside the desirable range:

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image1920×945 364 KB

A possible solution to that would be to apply some refinements or, in a better way, to cleanup your CAD so that some small faces and features that are not relevant to the analysis are suppressed, such as this one:

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image1920×945 110 KB

Does that help?

Best,
Igor

5

Thank you so much

6

Hello, thank you for responding. For the solution, what type of refinements should I use?