Hello! I have the following question: Is it possible to use the density based solver in Fluent for low Mach number flows (M=0.17)?

It begs the question why? When you have two pressure-based solvers to choose from?

You can use the density based solver for flows with low mach numbers because in Fluent coupled solver the equations are preconditioned. However, the cost will be low convergence rate. My advise is just use the pressure based solver

When the pressure based solvers are used (the segregated solvers), the resulting flow topology seems erroneous and does not match some flow visualization results. Because the coupled pressure based solver should be a bit more accurate, I have tried this one but I can not get it stable (I have tried all recommendations already). Leaves me with the density based coupled solver. This solver is able to operate in a stable fashion, but the question remains whether or not it is really justified to use this solver for a flow with a Mach number of 0.175

Kind regards

From the Fluent' user guide, both of solver can solve the incompressible flow.

I occurred the problem of AMG divergence: pressure correction when using pressure based solver for incompressible flow, but no problem for density based solver.

So the density based solver could be better than density based solver, if not considering the cost of memory.