[jango]

Hello Everybody,

To get used to OpenFOAM cases and solvers I`m playing around a bit with the karman vortex street. With the icoFoam Solver for laminar flow at low Reynolds nubmer this isn`t a problem.

But now I want to increase the Reynolds number und add a k-epsilon (near) wall treatment. The fluid is air with a temperature of 273 K and the wall temperature of the cylinder is 573 K. For this case I assumed, that rhoPimpleFoam should be the best solver. With the standard adjustments for this solver, the case runs without any convergence problems but I can see no vortexes. So I changed the runtime for the turbulent case an adjusted the material properties (thermophysical properties) to constantTransport with the according values of Pr and mu for air.

After a few iterations the solution diverges. Now I have a few questions:

Is the rhoPimpleFoam solver the best choice for this case ?
Adjusting the thermophysicalProperties according to this Problem (considering adjustments for Temperature and material properties for air) I get errormessages and convergence problems. Should I adjust the underrelaxation factors to stabilize the solution ?

Thank you a lot for your Help

Yours,

Jan