hi all, I am using specrtal method for 2D lid driven cavity flow problem. The results i have got seem to be OKAy.. but the problem is that pressure and vorticity contours show oscillation. I have tried using finer mash (upto 40*40) but its of no use. To avoaid oscillation we can use upwinding scheme in FD method but what can be done while using spectral method. I am using semi staggered collocation points(pseudospectral method). how can i remove this aberrant nature of the conours. any help/ suggestion?? please.....