Dear Lissandro, On Mon, 23 Jul 2007, Lisandro Dalcin wrote:
> On 7/23/07, Tim Kr?ger <tim at cevis.uni-bremen.de> 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 -- Dr. Tim Kroeger Phone +49-421-218-7710 tim at mevis.de, tim at cevis.uni-bremen.de Fax +49-421-218-4236 MeVis Research GmbH, Universitaetsallee 29, D-28359 Bremen, Germany Amtsgericht Bremen HRB 16222 Geschaeftsfuehrer: Prof. Dr. H.-O. Peitgen
