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Re: KSP/PC choice
Dear Lissandro,
On Mon, 23 Jul 2007, Lisandro Dalcin wrote:
On 7/23/07, Tim Kröger <tim@xxxxxxxxxxxxxxxxxxx> wrote:
the more KSP and PC methods are available, the more difficult it is to
choose a suitable one.
I want to compute Navier-Stokes (using Finite Elements) for
medium-sized Reynolds numbers (still laminar, though). I am currently
using
Are you solving incompresible flow?
Yes.
Tansient or steady state?
Transient.
Are you using a monolithic formulation; or a fractional-step like
formulation?
Monolithic. (I am not quite sure about this word but I assume it
means that I don't try to decouple the two equations.)
What kind of stabilization for advection and pressure are you using?
Streamline diffusion (for advection). I am not aware of the
requirement to stabilize the pressure as well.
I ask this because in my experience incompressible flows with
monolithic formulations are usually hard to solve, and a good choice
of stabilization method not only leads to better final solution, but
also lead to linear systems with better conditioning.
Would you recommend to use a fractional step method? Would you
recommend a different stabilization method? If you have any
suggestion, please let me know.
Best Regards,
Tim
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