how to get streamline
Hi! I have some question about postprocessor of computed results. I have already got the velocity fields for 3D flow. And I also got the velocity fields on the 2D intersection planes. Since there is no stream function for 3D flow. Is any one able to propose how to get the streamline for the velocity field on 2D intersection planes? Or is there some method for this case? Thanks!

Re: how to get streamline
(1). For 3D flows, the streamline will become a point on a 2D plane.

Re: how to get streamline
Dear Jeff
You can trace the path for imaginary massless particles inside the 3D domain and you will have a picture close to "3D streamlines". Is it what you want, or you need a 2D well defined stream function in every plane? Regards Kike 
Re: how to get streamline
Hi Jeff, I faced the same problem some months ago for 3D calculations. According to me, a efficient way to obtain streamlines (both in 2D planes or directly in your 3D geometry) is a very simple one : 1. choose some points at the entry of your domain 2. follow their displacement using the velocity vectors, from one finite element (or volume) face to another. As you the point reach on an face will probably differ from the grid points, just use interpolations to calculate the velocity vector on this point. 3. Do this until the streamline reach the exit of your domain. 4. If you have secondary flows (recirculations) in your flow geometry, just choose the starting points in this zone.
I have used this method to compute the streamlines in 3D pipes with abrupt contraction of their section. It worked very well!! I hope my answer could help you. 
Re: how to get streamline
You can try some public domain visualization package like VU or Vigie. Both allow plotting of streamlines. You can find the links on the CFD Resources page.

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