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This is how my mesh looks like. I am using half domain of 2D sphere assuming that it would symmetrical along phi domain. Tho my domain is 2d, I am describing 3D phenomena. I am using cylindrical coordinate. So... in real horizontal line mean r-axis and vertical line is z-axis. When r=0 (so the left straight line), I used boundary condition that u_r=0 (because there will be no flow across this axis if flow is symmetric) other boundary, sphere boundary condition is 0 velocity, and top,end,right side boundary condition is given by analytical solution (it was expressed in spherical coordinate, so I transferred it into cylindrical coordinate) To, Daniel Arndt. Also, I didn't understand what you meant by *"Are you using a Mapping of the same order as your velocity ansatz space is?"* Thanks for reply!!! -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.