Inflate Boundary Layer

Project Support
1

Hi, I’m am trying to study the influence of the layer in an airfoil.
In the first mesh I am not using a refinment for the layer, but, in the second I want to include a Influate boudary layer refinment. I did so, however, the results are the same i both cases and in the mesh obtained after the second meshing I cannot see the layer.

I don’t know if I have to do something more after including the influate boundary layer refinment in the simulaion-designer.

Thank.

2

Hi @mlino,

I’ve checked on this and am experiencing the same issue. Let me get back to you once I get it sorted out.

Cheers!
Anna

3

Hi @mlino,

Discovered the issue; you’ll need to change the min tetrahedron-quantity for cell (see Operation 1 under meshing).

Let me know if that fixes the problem.

Best,
Anna

3 Likes
4

I too have been having issues with non-existent inflation layers as well (attempting to get to y+ <1). Could you please explain in more detail why that needs to be changed and what it needs to be change to?

Thanks

5

You could try disabling the check to see if this is the issue, to disable you need to set to a low negative (Docs recommend -1e+30). you can do this for both quality and min volume to see if any give you better results.

Kind regards,
Darren

1 Like
6

Thanks!
Now the meshing worked as expected.

1 Like
7

Worked for me too. Thanks!

1 Like
8

A post was split to a new topic: Job execution was aborted, possibly due to a numerical instability

9

@1318980 Darren, Does using -1e+30 (a very large -ve number) effectively do the same thing as Anna’s value of 1e-30 (a VERY small +ve number)?

Thanks,
Dale

10

Hi Dale, not exactly but not far off. 1e-30 would be setting a tight control, -1e+30 is our way of telling the mesher not to look at it at all, and skip over that check.

Best,
Darren

11

Hi there. I have the same problem and I checked that the setting is already -1e+30 by default.

I am trying y+>30 so it’s not that fine. The boundary layer can form with the default “inflate BL” setting but once I make it finer, it doesn’t form anymore.

What else can I try?

12

Hi @cweisheng!

Can you open a new post in the project support category and tell us a little bit about your project as well as posting the project link there? Make sure it is public and we can have a look at this issue.

Cheers,

Jousef

13

Hi thanks, I have done so.