三维的Particle Flow怎么做？？？

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• Step 17: Animate velocity of trace particles.

Main Menu> General Postproc> Plot Results> Flow Trace> Defi Trace Pt Pick two or three points around the inlet region and one or two points in the recirculation region (along the upper wall of the transition region). [img]mkMSITStore:C:\Program%20Files\Ansys%20Inc\v80\commonfiles\help\en-us\ansyshelp.chm::/graphics/cfd_17_ans_a.gif[/img] OK (in picking menu). Utility Menu> PlotCtrls> Animate> Particle Flow Choose DOF Solution. Choose Velocity VX. OK. Ignore any warning messages about maximum number of loops (Choose Close). ANSYS creates a particle flow path based upon approximations that do not form closed loops. The resulting trace plot shows the path of flow particles through the duct. Make choices in the Animation Controller (not shown), if necessary, then choose Close.这是一个help里边的例子，可以用来做二维的Particle flow， 我做的是三维流场的分析 ，怎么做三维的Particle flow？？？？