HI Kamil, IterativeStaticCond should be faster. It also depends on which preconditioners you are running. I typically use: <GLOBALSYSSOLNINFO> <V VAR="u,v,w"> <I PROPERTY=“GlobalSysSoln" VALUE="IterativeStaticCond" /> <I PROPERTY="Preconditioner" VALUE="LowEnergyBlock"/> <I PROPERTY="IterativeSolverTolerance" VALUE="1e-9"/> </V> <V VAR="p"> <I PROPERTY=“GlobalSysSoln" VALUE="IterativeStaticCond" /> <I PROPERTY="Preconditioner" VALUE="FullLinearSpaceWithLowEnergyBlock"/> <I PROPERTY="IterativeSolverTolerance" VALUE="1e-6"/> </V> </GLOBALSYSSOLNINFO> In my xml files when running in parallel Regards, Spencer. On 5 Nov 2014, at 19:08, Kamil ÖZDEN <kamil.ozden.me@gmail.com<mailto:kamil.ozden.me@gmail.com>> wrote: Dear All, I'm solving a pipe flow problem with Incompressible Navier Stokes solver in a cluster with mpirun command. I saw that only IterativeFull solver reduces the run time of analysis when number of CPU is increased. Is this expected in Nektar? Regards, Kamil _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0) 20 759 45052