Dear PETSc Team, I am writing a CFD finite element code in C. From the discretization of the governing equations I have to solve a Poisson type equation which is really killing my performance. Which solver/preconditioner from PETSc or any external packages would you recommend? The size of my problem is from ~30000-100000 DOF per core. What kind of performance would I be able to expect with this solver/preconditioner? I am using a 2*quad core 2.3 GHz Opteron. I have decomposed the domain with Parmetis. Also, I am writing a code which studies free surface phenomena so the mesh is continually changing. Does this matter when choosing a solver/preconditioner? My left hand side matrix (A in Ax=b) does not change in time. Best regards and thank you in advance, Christian Klettner
