CFD Online Discussion Forums - Question about matching of solver and turbulence model

Hello everyone, I have a question about the solver and turbulence model. Are there any criteria that a certain solver is specially designed for a particular turbulence model.

The problem rises when I read through the user guide: http://cfd.direct/openfoam/user-guid...x13-940003.5.2

For instance, icoFoam is a

Quote:

Transient solver for incompressible, laminar flow of Newtonian fluids.

But what if the problem itself is not turbulent? In other words, if I use icoFoam to solve the flow around a circular cylinder with Re=1000, should I abandon the results obtained even if the job can be implemented?

In addition, pisoFoam is a

Quote:

Transient solver for incompressible, turbulent flow, using the PISO algorithm.

While simpleFoam is a

Quote:

Steady-state solver for incompressible, turbulent flow, using the SIMPLE algorithm.

Is that true where pisoFoam has to be used with LES turbulence model in order to obtain transient solution? And the solution is not transient if RAS turbulence model is used?
In contrast, is that true where simpleFoam has to be used with RAS turbulence model in order to obtain steady-state solution?