1, How could I plot the vorticity magnitude in CFD-View? 2,How could I creat a new variable,and then plot it? 3,How could I transfer the struct CFDRC results into tecplot or fieldview format.CFD-Tookit?

RTFM ... There is a formula editor near the bottom of the screen that you can use to create a new variable, which will get added to the list of plotable variables. You can select the parts (i.e. a given volume, plane or line) where you want this variable, so that it is not necessary to recalculate it for the whole domain. I don't have ready access to VIEW any more, or I would send you a screen dump of it. CFD-Toolkit will translate to other formats, although I think there is little sense in doing it, as a post-processor it is one of the better ones around. It could do with vorticity magnitude as a standard pre-calculated variable though, as well as a wall force integration.

Thank you very much for your help.

Hey,Charles,I have tried.But i didn't know the function of the vorticity magnitude.How to do ?

I see from your other posting that you have now got the function for the vorticity magnitude, so basically you just need to program it into View's expression editor. I can't help you further from here, because I don't have access to View at the moment. Is there any reason why you don't just ask CFDRC's help desk?