# Inflate Boundary Layer **URL:** \ **Category:** Project Support\ **Created:** [August 3, 2017, 12:22pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211 "2017-08-03T12:22:55Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![mlino](https://www.simscale.com/forum/letter_avatar/mlino/32/5_5575768a8748004e209b776fc1b2916d.png) [@mlino](https://www.simscale.com/forum/u/mlino)\ **Post date:** [August 3, 2017, 12:22pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/1 "2017-08-03T12:22:55Z")
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. > **[SimScale Login](https://www.simscale.com/workbench?publiclink=6d206846-bef2-4c90-a05f-89260ff1e8db)** > > Log in to your SimScale account. SimScale makes high-fidelity engineering simulation technically and economically accessible. At any scale. In the cloud. ---
**Author:** ![anon18194957](https://www.simscale.com/forum/letter_avatar/anon18194957/32/5_5575768a8748004e209b776fc1b2916d.png) [@anon18194957](https://www.simscale.com/forum/u/anon18194957)\ **Post date:** [August 3, 2017, 12:39pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/2 "2017-08-03T12:39:58Z")
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 ---
**Author:** ![anon18194957](https://www.simscale.com/forum/letter_avatar/anon18194957/32/5_5575768a8748004e209b776fc1b2916d.png) [@anon18194957](https://www.simscale.com/forum/u/anon18194957)\ **Post date:** [August 4, 2017, 7:38am UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/3 "2017-08-04T07:38:59Z")
Hi @mlino, Discovered the issue; you’ll need to change the min tetrahedron-quantity for cell (see Operation 1 under meshing). ![](https://www.simscale.com/forum/uploads/default/original/2X/b/b7b773a5cde75746958d956da6e09e7e2106f19e.png) Let me know if that fixes the problem. Best, Anna ---
**Author:** ![mas985](https://www.simscale.com/forum/letter_avatar/mas985/32/5_5575768a8748004e209b776fc1b2916d.png) [@mas985](https://www.simscale.com/forum/u/mas985)\ **Post date:** [August 4, 2017, 2:03pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/4 "2017-08-04T14:03:50Z")
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 ---
**Author:** ![1318980](https://www.simscale.com/forum/user_avatar/www.simscale.com/1318980/32/9637_2.png) [@1318980](https://www.simscale.com/forum/u/1318980)\ **Post date:** [August 4, 2017, 4:58pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/5 "2017-08-04T16:58:46Z")
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 ---
**Author:** ![mlino](https://www.simscale.com/forum/letter_avatar/mlino/32/5_5575768a8748004e209b776fc1b2916d.png) [@mlino](https://www.simscale.com/forum/u/mlino)\ **Post date:** [August 4, 2017, 6:43pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/6 "2017-08-04T18:43:28Z")
Thanks! Now the meshing worked as expected. ---
**Author:** ![mas985](https://www.simscale.com/forum/letter_avatar/mas985/32/5_5575768a8748004e209b776fc1b2916d.png) [@mas985](https://www.simscale.com/forum/u/mas985)\ **Post date:** [August 4, 2017, 8:27pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/7 "2017-08-04T20:27:22Z")
Worked for me too. Thanks! ---
**Author:** ![anon18194957](https://www.simscale.com/forum/letter_avatar/anon18194957/32/5_5575768a8748004e209b776fc1b2916d.png) [@anon18194957](https://www.simscale.com/forum/u/anon18194957)\ **Post date:** [August 6, 2017, 10:05am UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/8 "2017-08-06T10:05:42Z")
A post was split to a new topic: [Job execution was aborted, possibly due to a numerical instability](https://www.simscale.com/forum/t/job-execution-was-aborted-possibly-due-to-a-numerical-instability/77363) ---
**Author:** ![DaleKramer](https://www.simscale.com/forum/user_avatar/www.simscale.com/dalekramer/32/20201_2.png) [@DaleKramer](https://www.simscale.com/forum/u/DaleKramer)\ **Post date:** [July 30, 2018, 1:19pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/9 "2018-07-30T13:19:20Z")
> [@1318980](#): > > 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) @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 ---
**Author:** ![dlynch](https://www.simscale.com/forum/user_avatar/www.simscale.com/dlynch/32/16807_2.png) [@dlynch](https://www.simscale.com/forum/u/dlynch)\ **Post date:** [August 17, 2018, 4:28pm UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/10 "2018-08-17T16:28:57Z")
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 ---
**Author:** ![cweisheng](https://www.simscale.com/forum/user_avatar/www.simscale.com/cweisheng/32/22803_2.png) [@cweisheng](https://www.simscale.com/forum/u/cweisheng)\ **Post date:** [March 2, 2019, 8:53am UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/11 "2019-03-02T08:53:56Z")
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? ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [March 2, 2019, 9:14am UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/12 "2019-03-02T09:14:33Z")
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 ---
**Author:** ![cweisheng](https://www.simscale.com/forum/user_avatar/www.simscale.com/cweisheng/32/22803_2.png) [@cweisheng](https://www.simscale.com/forum/u/cweisheng)\ **Post date:** [March 3, 2019, 2:59am UTC](https://www.simscale.com/forum/t/inflate-boundary-layer/77211/13 "2019-03-03T02:59:33Z")
Hi thanks, I have done so.