In many papers, the vorticity fig can be seen, so if we have the u.v.w flow field, how to draw the vorticity fig.

Who have such experience or give some sample codes.

Thanks!

Have a simple subroutine to calculate the vorticity, which can be done once you have the velocity values.The equations for 2d and 3d can be found in any introductory fluid mechanics book.

hi.. Harish Now do you have such subroutine, can send me one to learn? Thanks much! mud2003@126.com

for 2D, you can a vector vorticity field with + or - stating its directions. For 3D, the vorticity is a vector having three components in three directions. Hence it is convenient to have the magnitude of the vorticity. vortiticy is the curl of velocity vector. Google it and you will know

hi.. dingxin

Do you mean : "wx = dw/dy - dv/dz wy = du/dz - dw/dx wz = dv/dx - du/dy w = wx(i) + wy(j) + wz(k) vorticity magnitude = sqrt(w.w) = sqrt( wx*wx +wy*wy +wz*wz) "

but as if the solution for the boundary is difficult? I do not know how to do

Just use standard differencing formulas to numerically differeniate the velocity field. It's really not that hard to do.