Re: [Gfs-users] No-Slip Boundary Condition for Embedded Solids

[Stephane P. <s.p...@gm...>]

Hi Blake,

> I'm having trouble setting a no slip boundary condition on embedded solids. I've tried:
>
> GfsSolid super_thin_plate.gts
> GfsSurfaceBc U Dirichlet 0.0

No slip boundary conditions are applied by default on embedded solids.

> But the surface continues to take on a slip boundary (as indicated when I visualize
> GfsOutputBoundaries, and in the results of the simulation).

>From your simulation file, your Reynolds number would be of order:

Re = U*L/nu = 0.2*1/0.000010022315 = 20000

so that the fully-developed boundary layer around your solid would
have a maximum thickness of order:

1/sqrt(Re) = 1/141

i.e. a few grid points with your setup. You will also  need to wait
quite a long time to reach this thickness.

If you want to see the boundary layer, you need to either 1) decrease
the Reynolds number, 2) be patient!

cheers

Stephane