# how to get streamline

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 April 19, 2001, 13:20 how to get streamline #1 jeff Guest   Posts: n/a Hi! I have some question about post-processor of computed results. I have already got the velocity fields for 3-D flow. And I also got the velocity fields on the 2-D intersection planes. Since there is no stream function for 3-D flow. Is any one able to propose how to get the streamline for the velocity field on 2-D intersection planes? Or is there some method for this case? Thanks!

 April 19, 2001, 13:34 Re: how to get streamline #2 John C. Chien Guest   Posts: n/a (1). For 3-D flows, the streamline will become a point on a 2-D plane.

 April 20, 2001, 04:32 Re: how to get streamline #3 Kike Guest   Posts: n/a 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

 April 20, 2001, 07:53 Re: how to get streamline #4 Anthony Wachs Guest   Posts: n/a 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.

 May 9, 2001, 13:47 Re: how to get streamline #5 CFD Code Writer Guest   Posts: n/a 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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