Dear Bob,nThanks for your answer!nAs seen in the equation below, the velocity profile on the boundary (the U∞ ) is only a part of my self-defined variable. Uw is the local velocity and can be easily obtained. But I still don't know how to get the value of the right side of equation along a line.nI create the line by Setting Up Domain>Surface>create>Line/Rake using End Points.nI am trying to export the value of the above equation through a line.nnThanks,nDarrynn