How to output velocity filed


I was confused about how to output velocities ?u,v,w??

I do not understand the question.

Thanks for you reply!

I want to plot the velocity field by Tecplot , how can I output the velocities in three direction. In the LB code “getVelocityNorm()” is the scalar filed, but I try to output the vectors. Could you tell me how to make it? Thanks!