Hi Reda, Currently no Fourier interpolation is set up, so when the z-component of a history point does not correspond to that of a plane the point is moved. I suggest you work out in a preprocessing step where you want your points to be given the number of planes you will be employing, so that you are sure they will be in the correct spanwise location. Kind regards, Andrea On 21 Apr 2019, at 13:50, Moto Light <redamansyhh@gmail.com<mailto:redamansyhh@gmail.com>> wrote: Hi All, I am setting prob line on 2.5D for 4D spanwise, for using 32 modes or 64 modes it is ok, but when i am using 48 modes it changes the points location like this: Reseting History point from z = 2.83333 to z = 2.75 Reseting History point from z = 2.91667 to z = 2.91667 Reseting History point from z = 3.08333 to z = 3 Reseting History point from z = 3.16667 to z = 3.16667 Reseting History point from z = 3.33333 to z = 3.25 Reseting History point from z = 3.41667 to z = 3.41667 Reseting History point from z = 3.58333 to z = 3.5 Reseting History point from z = 3.66667 to z = 3.66667 Reseting History point from z = 3.83333 to z = 3.75 Reseting History point from z = 3.91667 to z = 3.91667 any suggestions? Regards, Reda _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users