Now, I am busy calculating flow field of Bowed and Twisted turbomachinery blades,so I want to know how to show secondary flow and vortex in the passages.please tell me, thanks!

(1). To be able to show the secondary and vortex flow, first you must be able to compute such features of the flow. (2). Once you have the flow field computed, you can use the graphic post-processor to display the flow features in the way you like. There are vector plot, contour plot, particle tracing, etc... you can use.