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#1 |
New Member
Pratik Chalke
Join Date: Mar 2023
Posts: 5
Rep Power: 3 ![]() |
Well my Velocity at inlet and outlet are about 2m/s and 3.5m/s respectively, but I am getting relatively high velocities in the impeller region also I the velocity contours have centre at different location then the impeller. Is this because the rotation origin I have provided is wrong? Because I changed the origin of geometry in Spaceclaim before meshing, although the geometry was designed in Solidworks. |
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#2 |
Member
MC
Join Date: Apr 2021
Posts: 43
Rep Power: 5 ![]() |
The erroneous behaviour you see may have several causes, from modeling (mesh, solver...) to geometry and boundaries.
Without further info, I cannot help more |
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#3 | |
Senior Member
Join Date: Jun 2009
Location: Technische Universität Chemnitz
Posts: 107
Rep Power: 17 ![]() |
Quote:
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#4 |
New Member
Pratik Chalke
Join Date: Mar 2023
Posts: 5
Rep Power: 3 ![]() |
I recreated the geometry and did everything over again, and now Velocity Contour seems to be normal but now I am getting issue in CFD POST where the streamlines are not complete till the end if anyone knows please help.
![]() https://drive.google.com/file/d/1Jun...ew?usp=sharing https://drive.google.com/file/d/1yka...ew?usp=sharing https://drive.google.com/file/d/1OPZ...ew?usp=sharing |
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#5 |
Member
MC
Join Date: Apr 2021
Posts: 43
Rep Power: 5 ![]() |
I had a similar issue once, and I could not solve it in CFD-post. I had to switch to Ensight, where the streamlines are treated better.
Maybe someone can provide better help. |
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#6 |
Senior Member
Join Date: Jun 2009
Location: Technische Universität Chemnitz
Posts: 107
Rep Power: 17 ![]() |
Yes CFD Post has problems when crossing an interface, but it is much better than what is Fluent post-processing. The problem arises from a drastic change of the angle in streamlines at the interface. There are settings where you can change the integration accuracy, and it may let some through. Looking at the velocity contours, I can almost visualize the grid. This is an indication that integration along the streamlines will change per control volume, and at the interface it gives up.
Go back and double-check the interfaces. What rotating model are you using at the interface? What does the mesh look like? |
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#7 |
New Member
Pratik Chalke
Join Date: Mar 2023
Posts: 5
Rep Power: 3 ![]() |
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#8 |
Senior Member
Join Date: Jun 2009
Location: Technische Universität Chemnitz
Posts: 107
Rep Power: 17 ![]() |
The contours are not smooth. If you were to plot the mesh on the same plane as these velocity contours, I would expect the contours to follow the mesh lines. This is an indication that the mesh should be refined and that uncertainty in the integration could be the reason why the streamlines end. Are you limited to a certain number of elements (student license or something similary)? If not, maybe increase the resolution and see if that helps.
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#9 |
New Member
Pratik Chalke
Join Date: Mar 2023
Posts: 5
Rep Power: 3 ![]() |
Thank Your very much for your help, I will try what you said.
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Tags |
fluent, origin, velocity |
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