thickness layer

[Miyuki.Azukira]

Hi,

I am new and still not familiar using CFD Autodesk. I have question, can anyone help me how to create thickness layer or extrude mesh like the picture below?

Thank you for your attention.

[Jon.Wilde · Accepted solution]

This looks fairly standard to me. They might have just added a few layers, so something like this (Wall Layers within the meshing) should give you a few additional layers.

The wall layers are prismatic like default.

[Miyuki.Azukira]

Hi Jon, thank you for your reply. I was try many time to set like that. Actually I want to create a geometry of wing with rectangle boundary then generate refine mesh near wing but coarse near the wall of boundary. Please see the picture.

The wing located centre of that geometry. I separate the boundary.

I want to set growth mesh of edge near the wing but I can not.

Thank you for your sharing.

[Jon.Wilde]

It might be easier to just add a mesh refinement region around the wing. Or a few of them, this should give you a nice mesh transition 🙂

[Miyuki.Azukira]

Thank you for your reply. I was tried as your advice. But I can not to solve it. I set the boundary condition like this picture.

- inlet as velocity

- outlet as pressure

- side view as slip/symmetry

- other side view as periodic (because I just create half of geometry)

- top and bottom side I want to set as wall but there is no option for wall so I am not set that and also the wing

then I want to solve this geometry, suddenly appear the warning like this.

Could you give me some advices? Thank you for your help.

[matt.bemis]

Hi @Miyuki.Azukira,

The solver is exiting because the periodic boundary condition is set incorrectly. Check out this article on using periodic boundary conditions. I think in this case it would make sense to just use a slip/symmetry BC instead of periodic.

Please let me know what you think!

Thanks,

[Miyuki.Azukira]

Hi @matt.bemis, thank you for your reply.

Actually I want to simulate this geometry, I think it is symmetry.

But to reduce computational I create half of that like the picture previously.

So it is better to set the BC from periodic to symmetry? what about BC of the bottom and top? I want to set as wall, but there is no option for wall. Does no need to be initialized?

Let me know if I am wrong. Thank you for your attention.

[matt.bemis · Accepted solution]

Hi @Miyuki.Azukira,

You definitely want to use the symmetry boundary condition, not periodic. The slip/symmetry BC allows the flow at the wall to be the same as the free stream velocity (upstream flow, here it'd be your inlet BC). By assigning the slip/symmetry BC there will be no boundary layer near the wall. 

If you do indeed want to model a physical wall, then no boundary condition will be necessary. The flow will have a 0 velocity at the wall and a boundary layer will develop.

I hope this helps!

Thanks,