Learning Forum

[yg327]

Hi, I encountered a problem with fluent 18.2. 

I tried to simulate the velocity field inside a mixer. But I found I could not draw pathline for this mixer, no matter starting from the inlets or the outlet(reversed). I tried to draw mesh with ICEM and mesh, both 18.2

Nearly all the path lines failed, and the the console said: Can't figure which cell particle is going to -- ABORT Cannot find intersecting face for particle 210 -- ABORT

It seems that the failures happen at the interface of wider channel and smaller channel.

Thanks in advance.

 

[yg327]

The pathilnes start from the outlet by clicking ''reverse'' in path line dialogue. But the pathlines stop at the interface between the main channel and small channel. Thanks a lot.

[Rob]

Do you have a non-conformal mesh at that location? Please plot the velocity vectors on a plane through the cylinder centreline (plane of constant x or y). 

[yg327]

Many thanks for your help. I uploaded the mesh (by ICEM) and vector. I have one doubt about the mesh quality. It seems that the aspect ratio can be high. will high aspect ratio cause aborted pathline, please? Thanks again.

 

[Rob]

Possibly, but I'd look to improve the mesh for accuracy reasons too.  If you reduce the step length in the Pathline panel it may help: the jump in cell size is also likely to cause problems.