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March 23, 2017, 13:29 |
Podded Propeller Simulation Problem
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#1 |
New Member
Nicholas Hughes
Join Date: Mar 2017
Posts: 3
Rep Power: 9 |
Hello,
I am modelling a fairly simple problem with a propeller, using sliding reference frame method. The physical testing boundaries are within a cavitation tunnel. I have completed the open water tests with good results. I am now attempting to partially block the flow (solid object covering part of the inlet- in an attempt to see the performance differences). I was able to model cavitation in the open water tests, however the divergence was almost immediate and getting floating point errors with the blocked flow. I have removed multiphase and VOF and I am now attempting to solve the problem without the cavitation. I am still getting floating point error before 10 iterations. Cell count ~2.1M time step is for 1 degree of rotation and max time is set to allow 3 rotations. models selected are: constant density, gradients, segregated flow, liquid, all y+, SST (menter), K-omega turbulence, RANS, exact wall distance, implicit unsteady, gravity, turbulent, 3D I have interfaces on the required boundaries however, they are very close to the blockage. I am unsure if this will affect their abilities or not. I hope I have provided enough information to provide an understanding of what I have and am trying to achieve. Thanks, Nick |
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March 24, 2017, 02:13 |
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#2 | |
Senior Member
Lane Carasik
Join Date: Aug 2014
Posts: 692
Rep Power: 15 |
Quote:
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March 24, 2017, 04:39 |
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#3 |
New Member
Nicholas Hughes
Join Date: Mar 2017
Posts: 3
Rep Power: 9 |
Hello Icarasik,
The boundary conditions are 'wall' for everything except the inlet (the large of two rectangles ahead of the propeller- flow is coming onto the propeller face), outlet at the opposite end and interfaces on all three surfaces of the rotating part. Nick |
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March 25, 2017, 03:08 |
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#4 |
Senior Member
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 25 |
Please post pictures of the mesh.
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March 25, 2017, 08:07 |
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#5 |
New Member
Nicholas Hughes
Join Date: Mar 2017
Posts: 3
Rep Power: 9 |
Hello,
It's okay, I have worked my way through the problem and now have a perfectly running simulation. Thanks to anyone who got back to me! Nick |
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March 31, 2017, 22:19 |
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#6 |
Senior Member
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 438
Rep Power: 18 |
Thank you not - for not sharing the solution.
Others might come across with similar question. |
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Tags |
blocked flow, interface, propeller |
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