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June 11, 2020, 20:48 |
Flow field around a rotor
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#1 |
Member
Bidesh Sengupta
Join Date: Sep 2018
Location: Sngapore
Posts: 76
Rep Power: 8 |
Hi everyone.
I wish to simulate a rotor with NACA0012 blades with 8 deg AOA and 0 deg cyclic pitch. The diameter is 0.78m. I used MRF with ggi interface between static and rotating interface. The freestream velocity is 15m/s in the positive X direction. I am getting a very low-velocity zone at the end of the blade to ggi interface of the rotor. It seems there is a strong demarkation across ggi interface in the flowfield of U. I am sharing the the filed of U, p and rho. (The figures in XZ plane are taken at Y=-0.2m) Can anyone please give some insight to it. Thank you |
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June 15, 2020, 04:37 |
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#2 |
Senior Member
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Hi,
I had similar issues when I forgot to add the AMI/ggi to the list of nonRotatingPatches in MRFProperties. So that might be the issue? Regards, Tom |
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June 15, 2020, 19:59 |
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#3 |
Member
Bidesh Sengupta
Join Date: Sep 2018
Location: Sngapore
Posts: 76
Rep Power: 8 |
Thanks a lot for your reply. I just wanted to ask that should I add both ggi patches connected to rotor and stator in the list of nonRotatingPatches.
My boundary file is: Code:
4 ( RotorGGI { type ggi; nFaces 20200; startFace 14221862; rotationAxis (0 0 1); nCopies 30; shadowPatch StatorGGI; zone RotorGGI_faces; bridgeOverlap true; } wall { type wall; nFaces 107940; startFace 14242062; } farfield { type patch; nFaces 4800; startFace 14350002; } StatorGGI { type ggi; nFaces 6100; startFace 14354802; rotationAxis (0 0 1); nCopies 30; shadowPatch RotorGGI; zone StatorGGI_faces; bridgeOverlap true; } ) Code:
1 ( cellRegion0//rotor { // Fixed patches (by default they 'move' with the MRF zone) nonRotatingPatches (farfield); nonRotatingPatches (RotorGGI); nonRotatingPatches (StatorGGI); origin origin [0 1 0 0 0 0 0] (0 0 0); axis axis [0 0 0 0 0 0 0] (0 0 -1); omega omega [0 0 -1 0 0 0 0] 333.3; } ) Thank you. Last edited by BSengupta; June 16, 2020 at 05:22. |
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June 16, 2020, 05:23 |
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#4 |
Member
Bidesh Sengupta
Join Date: Sep 2018
Location: Sngapore
Posts: 76
Rep Power: 8 |
I apologies for asking a foolish question. I just added StatorGGI, I thinking it it working.
Thank you. |
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June 16, 2020, 05:33 |
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#5 |
Senior Member
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Hi,
I guess you have only the cellRegion0 as rotating cellZone? You only need to add the ggi patches that are in the rotating cellZone. I do not know if that is the StatorGGI or the RotorGGI, it depends on how you named them. Regards, Tom |
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Tags |
flow field analysis, ggi, mrf, openfoam, rotating boundary |
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