Dear all, I am running the timestepper of the I*ncNavierStokesSolver* for a *Quasi-3D* problem in *parallel*. As I mentioned in a previous email, the default combination of linear solver and preconditioning (allegedly *IterativeStaticCond*) seems to be producing non-physical oscillations in the pressure field. I have tried to follow the suggestion that non-default settings (and different for velocity and pressure fields) like those specified in the user guide as an example might improve the situation: <GLOBALSYSSOLNINFO> <V VAR="u,v,w"> <I PROPERTY="GlobalSysSoln" VALUE="IterativeStaticCond" /> <I PROPERTY="Preconditioner" VALUE="LowEnergyBlock"/> <I PROPERTY="IterativeSolverTolerance" VALUE="1e-8"/> </V> <V VAR="p"> <I PROPERTY="GlobalSysSoln" VALUE="IterativeStaticCond" /> <I PROPERTY="Preconditioner" VALUE="FullLinearSpaceWithLowEnergyBlock"/> <I PROPERTY="IterativeSolverTolerance" VALUE="1e-6"/> </V> </GLOBALSYSSOLNINFO> These preconditioners seem incompatible with Quasi-3D discretisations and the solver crashes with an error. I have tried different combinations but the only that seems to be working is *Diagonal* for "*u,v,w*" and *FullLinearSpaceWithDiagonal* for "*p*". Are these the defaults when a mere IterativeStaticCond is specified in SOLVERINFO or nothing is said at all? If so, what are the default values for *IterativeSolverTolerance*? Are these tolerances the same for velocity and pressure fields? Is there any other preconditioning option that I can use with quasi-3D problems? Cheers