[MissCFD]

All other things of the simulation being equal, if I use the k-epsilon model instead of the SAS model, does the simulation run faster?

Thanks

[ghorrocks]

Your initial assumption that all other things are equal is not valid. A k-e model will be run using RANS, so will have a mesh and time step to capture the mean flow field only. Also k-e models can be run steady state. The SAS model needs to have a mesh and time step to capture the large scale turbulent fluctuations - which will require a finer mesh and finer time step. The SAS model is transient by definition and cannot be properly run steady state.

So a properly validated k-e model should be much faster than a properly validated SAS model, but mainly because the mesh and time steps are finer and it is steady state versus transient.