[quarkz]

Hi,

I am running a hypersonic (M = 5) flow simulation on a double cone, using rhoCentralFoam. Currently I'm running a low resolution case (y+ ~ 4000) with laminar flow. The simulation ended successfully and I got some meaningful result. However, I wanted to test running with RANS, specifically using k Epsilon and k Omega SST.

I tried to use a turbulence length scale of 0.075m (7.5% of my reference length) and Turbulence intensity of 0.05% and then generate the values according to: https://www.cfd-online.com/Tools/turbulence.php

However, the simulation crashes right from the start. Having no experience with turbulence simulation, I'm not sure what's wrong. I tried changing some parameters like using a smaller CFL no., changing the solver, preconditioner. But they didn't help.

Anyway, I've listed down areas which I should change. But can anyone guide me? As to which is the most important:

1. CFL no, delta t etc
2. grid size, y+
3. solver, preconditioner
4. boundary conditions
5. turbulence parameters

Thanks!