"A multi-region mesh was assigned - this analysis-type requires a single-region mesh." error for incompressible analysis

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1

Description of the error shown when trying to run a simulation: A multi-region mesh was assigned - this analysis-type requires a single-region mesh.

Project: SimScale

These may be the causes (extracted from: Error: Multi-Region Mesh in Non-CHT Simulation | SimScale)

A second common cause is related to the Advanced concepts . For single-region analysis, we may intentionally have more volumes when we are modeling advanced concepts:

If the user forgets to create a cell zone and assign it to an advanced concept, it will result in a multi-region mesh error when running a simulation.

2

Hi there, for an incompressible analysis, only the flow domain should be present, meaning these 3 solid parts should be deleted:

solids
solids2230×1270 130 KB

You can do this by using the CAD mode, and specifically the Delete body feature.

Regarding the second question, do you have a specific project you are referring to? The one you sent me does not seem to contain any Advanced concepts.

Best regards,
Fillia

3

Ok, I’ll try to delete them, thanks. But what do you mean by 2nd queston?

4

Is this another concern of yours regarding your project?

5

Well, now that I’ve generated my mesh I decided to run the simulation, but this appeared again: "A multi-region mesh was assigned - this analysis-type requires a single-region mesh. "

6

It makes sense, because the solid part is not removed yet:

solid
solid1717×1196 97.2 KB

8

But then it would delete the 3D model, right?

9

Sure, but the gap inside the domain that represents the model will still be there :slight_smile:

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