[nikos]

Hi everybody,
I'm trying to investigate airflow around a rectangular cylinder.
The choosen mesh is an hexaedral unstructured mesh appropriate for a low reynolds number modelling at wall. I've tested this case under turbfoam and everything is OK.
I've started the computation with smagorinsky approach and same parameters as those provided in pitzdaily case conserning the numerical approach.
A turbulentinlet is provided at inlet and pressure outlet at outlet.
Around the body, the airflow is developping fine, however I can see a pressure oscillation in time (from -0.2 to 0.2 in a p* formulation ) travelling from inlet to outlet where p* remains 0.
Solver is GAMG with GS smoothing.
CFL max is 2 and mean value is quasi 0.
I've tried to reduce the timestep but similar phenomena occurs.

Can it be due to delta coefficients, because my mesh is relatively coarse at inlet and I have an agressive refinement around the body ?

I've also tried to increase non orthogonal corrections but nothing has changed ?

What do you think of using GAMG as preconditionner for PCG approach because there is a large time reduction during time step ?

ps : i've applied modified backwarddtscheme provided and recompiled.