# streamlines

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August 20, 2018, 04:53
streamlines
#1
New Member

Carlos
Join Date: May 2017
Posts: 16
Rep Power: 8
Hello all,

I am having problems to understand physically the result of one simulation. It is a 3D multiphase-jet. I have projected the streamlines in the interface separating the fluids. I have got some streamlines which cross each other (please see attached image). I know that the streamlines cannot cross except where the velocity is zero.

The only reason that I may find to explain this behaviour is that in a 2D projection of a 3D flow, the streamlines may appear to cross.

What do you think?

Attached Images
 Screen Shot 2018-08-17 at 18.00.23.jpg (130.3 KB, 11 views)

 August 20, 2018, 05:15 #2 Member   Philipp Wiedemer Join Date: Dec 2016 Location: Munich, Germany Posts: 42 Rep Power: 9 But were do they cross? They just seem to converge to a singular point / line in the middle. There the tangential velocity in plane is probably in fact zero with the fluid flowing orthogonal to your plane. To understand the physics further you could visualize: - 3D-streamlines - streamlines in other planes orthogonal to your current one - streamlines in other planes parallel to your current one - the tangential velocity in your current plane (to verify my statement) - a combination of some of them If they're really just 3D-streamlines projected on your plane then they sure can cross each other, like you said. But it looks too "tidy" to me to be projected, seems more like streamlines calculated by the tangential velocity.

 August 20, 2018, 06:00 #3 New Member   Carlos Join Date: May 2017 Posts: 16 Rep Power: 8 Hello Philipp Wiedemer Thanks for your replay. I will visualise the different aspects that you have proposed. I will let you know about what I find. Thanks a lot again.

 Tags cfd analysis, streamlines