Custom streamlines - only 2 velocity components

bernarde · August 18, 2009, 06:24

Hi

I'm working with rotating low in a tube. I would like to visualise the axial and radial components of the flow in the tube with streamlines (ie no tangential component).

I have tried doing this with constrained streamlines, but it doesn't give the right results. Is there any way to construct these streamlines. Maybe it would be necessary to write a user code for this?

I have attached an image of the type of streamlines I'm looking for.

Thanks

chittoorreddy · August 19, 2009, 00:28

Hai,

I can say that figure which u given is plotted using the Tecplot.
you also can try the same.

Maddin · August 19, 2009, 05:14

Looks like iso surface?

bernarde · August 24, 2009, 05:42

Thanks for the replies guys

I have found the reason for the problem. The plots I attached were done from a 2D axisymmetrical simulation, thus the center of the vortex was by default in the center of the tube. My simulation is a 3D simulation, and the center of the vortex is not in the center of the tube, and it is also not straight. Thus ant plane I cut through the flow, doesn't go through the center of the vortex, and I'm not able to eliminate the tangential velocity component.

I'm still investigating ways of generating the plot I'm looking from - I think I might try to write a used code to generate a trace of the normal streamline as it intersects a plane in the middle of the tube, and then connecting the trace points.

Maddin · August 24, 2009, 05:56

Hmm make it 2D?

bernarde · August 24, 2009, 08:18

Do you mean do the simulation in 2D, or convert the results to 2D?

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August 19, 2009, 00:28		#2
chittoorreddy New Member chittoorreddy Join Date: Aug 2009 Posts: 5 Rep Power: 17	Hai, I can say that figure which u given is plotted using the Tecplot. you also can try the same.

August 19, 2009, 05:14		#3
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Looks like iso surface?

August 24, 2009, 05:42		#4
bernarde Member Bernard Esterhuyse Join Date: Mar 2009 Location: Pretoria, South Africa Posts: 50 Rep Power: 17	Thanks for the replies guys I have found the reason for the problem. The plots I attached were done from a 2D axisymmetrical simulation, thus the center of the vortex was by default in the center of the tube. My simulation is a 3D simulation, and the center of the vortex is not in the center of the tube, and it is also not straight. Thus ant plane I cut through the flow, doesn't go through the center of the vortex, and I'm not able to eliminate the tangential velocity component. I'm still investigating ways of generating the plot I'm looking from - I think I might try to write a used code to generate a trace of the normal streamline as it intersects a plane in the middle of the tube, and then connecting the trace points.

August 24, 2009, 05:56		#5
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Hmm make it 2D?

August 24, 2009, 08:18		#6
bernarde Member Bernard Esterhuyse Join Date: Mar 2009 Location: Pretoria, South Africa Posts: 50 Rep Power: 17	Do you mean do the simulation in 2D, or convert the results to 2D?