[General] streamlines pass through no slip walls

piedycat · September 2, 2015, 05:46

Hi,
I have a fluid flow of 2 fluid domains separated by a no-slip boundary, when I use the streamtracer filter to plot streamlines originating from one of the inlets the streamlines cross through the no-slip boundary into the adjacent flow? how can this be prevented?
Regards
Mark

al_th · September 2, 2015, 08:21

I also had this behavior happening to me. In my case, the wall was just a zero thickness interface between two different cavities.

I did not investigate too much about the how and the why, but I would assume that it is due to the mesh dicretization.

As paraview has not been told that you have a wall, but only sees the vector field, if the velocity vector field is pointing to the wall at the boundary cell, I would assume that it just goes straight into it.

You can try refining your mesh at the boundary or, if it is not an option, just don't show the unwanted/unphysical streamlines for visualisation

mujika · April 4, 2018, 11:33

I got the same issue but with just regular non-slip walls.

There is an option, streamTraces.TerminalSpeed, but didn't make things better for me.

I ended up going through all SeedIDs and ignoring the ones that were too short to make any sense. Not the best solution, because I am sure some of the ones that prematurely ended were included.

All in all, I think we can agree that this shouldn't happen with walls:
"Production of streamlines terminates if a streamline crosses the exterior boundary of the input dataset (ReasonForTermination=1)"

September 2, 2015, 05:46	streamlines pass through no slip walls	#1
piedycat New Member Mark Smith Join Date: Sep 2015 Posts: 1 Rep Power: 0	Hi, I have a fluid flow of 2 fluid domains separated by a no-slip boundary, when I use the streamtracer filter to plot streamlines originating from one of the inlets the streamlines cross through the no-slip boundary into the adjacent flow? how can this be prevented? Regards Mark

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September 2, 2015, 08:21		#2
al_th New Member Al_th Join Date: Apr 2015 Posts: 19 Rep Power: 11	I also had this behavior happening to me. In my case, the wall was just a zero thickness interface between two different cavities. I did not investigate too much about the how and the why, but I would assume that it is due to the mesh dicretization. As paraview has not been told that you have a wall, but only sees the vector field, if the velocity vector field is pointing to the wall at the boundary cell, I would assume that it just goes straight into it. You can try refining your mesh at the boundary or, if it is not an option, just don't show the unwanted/unphysical streamlines for visualisation

April 4, 2018, 11:33		#3
mujika New Member mujika Join Date: Feb 2014 Posts: 4 Rep Power: 12	I got the same issue but with just regular non-slip walls. There is an option, streamTraces.TerminalSpeed, but didn't make things better for me. I ended up going through all SeedIDs and ignoring the ones that were too short to make any sense. Not the best solution, because I am sure some of the ones that prematurely ended were included. All in all, I think we can agree that this shouldn't happen with walls: "Production of streamlines terminates if a streamline crosses the exterior boundary of the input dataset (ReasonForTermination=1)"