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November 12, 2019, 20:54 |
Hovering rotor thrust coeff values
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#1 |
New Member
Karthik
Join Date: Mar 2019
Posts: 3
Rep Power: 7 |
Hi,
I have been trying to simulate a hovering rotor case of Caradonna and tung. I used overset mesh to prescribe rotation (Rigid body rotation) to the rotor blades. I have obtained thrust coeff value for the case and it is 100% greater than the experimental value. I have even obtained mesh convergence results and have been using a time step of 1 degree rotation. If anything rings a bell please let me know. I believe I am using right setup as following literature but not sure where its going wrong. Just to clarify: collective pitch angle of 8 degree means each rotor blade has a pitch angle of 8 degree right ? Thanks |
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November 13, 2019, 03:28 |
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#2 |
New Member
demirel suleyman
Join Date: Apr 2017
Location: Turkey
Posts: 28
Rep Power: 9 |
Hello,
I am working for a while at a VAWT concept and I used the same procedure with overset mesh and DFBI and works well. I did validated my simulation results with experimental data. Pay attention that the maximum rotation allowed in one time-step should be max of the smallest cell size from the overset mesh, not 1 degree of rotation. In the beginning I had problems with with the power output because of the DFBI inertia moments, my input was wrong. I calculated them again and the results improved. Good day, dmirel |
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November 13, 2019, 07:59 |
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#3 |
Senior Member
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 437
Rep Power: 18 |
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November 14, 2019, 12:05 |
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#4 |
New Member
demirel suleyman
Join Date: Apr 2017
Location: Turkey
Posts: 28
Rep Power: 9 |
Cwl,
For some people is enough, for others is not but I did not said that is not enough dmirel |
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