Problem simulating high airspeed over airfoil

Project Support
1

I am trying to get a compressible wind tunnel test of a wing. The wing is at an altitude of 43000 ft and a airspeed of 250 m/s (mach 0.85). I want to see if the wing is viable at this speed, and eventually compare three different wing planforms to see which is best.

I filled in all values correctly, I think. I changed pressure and viscosity, k and omega I kept the standard value. But every time i try to simulate it it says “The maximum number of iterations exceeded” Is it possible to simulate such a high airspeed? could the low quality mesh operation has something to doe with it?

my project

3

Hi @timovM,

The first thing I see here is the mesh:

45
451678×1258 197 KB

The bounding box needs to be much bigger in all dimensions, also you should inflate the boundary layer. This is just good practice advice and might not be your issue.

I find when performing simulations at high velocities stability issues occur, this can be reduced by ramping the velocity via a CSV upload. Adjusting the gradient of the ramp, and reducing the relaxation factors should start producing stable runs.

Kind regards,
Darren

1 Like