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Adjusting momentum source in actuator disk turbineSiting |
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#1 |
New Member
Kim Best
Join Date: Jan 2021
Posts: 20
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Hi,
I'm fairly new to openFoam and I'm trying to simulate a 2D ABL flow over a single turbine and a single sinusoidal hill. The turbine is located just upstream of the hill. I've used the turbineSiting tutorial as a template for this, and have successfully meshed my own geometry. I went from a 3D to 2D mesh with snappyHexMesh by using extrudeMesh and createPatch (as in the wingMotion tutorial), so now my side patches are set as empty. I can converge on a solution okay and the boundary layer appears correctly. I don't however think the solver is recognising the presence of the turbine. The effect seems almost negligibly different from an equivalent simulation with no turbine when I view the results. If I adjust the pressure and thrust coefficients in fvOptions, there is no change to the solution. Would I be correct in saying that it is through fvOptions that I control the strength of the momentum source in the flow, or should I be looking elsewhere? fvOptions: Code:
disk1 { type actuationDiskSource; variant variableScaling; selectionMode cellSet; cellSet actuationDisk1; diskArea 0.04; diskDir (1 0 0); writeToFile true; sink false; Cp 0.5; Ct 0.75; monitorMethod points; monitorCoeffs { points ( (-0.1 0.125 0.04) ); } } Code:
flowVelocity (10 0 0); pressure 0; turbulentKE 0.1275; turbulentEpsilon 0.3733; Code:
simulationType RAS; RAS { RASModel kEpsilon; turbulence on; printCoeffs on; kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; sigmaEps 1.11; //Original value:1.44 } } |
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#2 |
New Member
Kim Best
Join Date: Jan 2021
Posts: 20
Rep Power: 5 ![]() |
I'm also attaching here a picture of the mesh (where you can see the refined region for the actuator disk) and the streamwise velocity field.
https://ibb.co/Zz71S1M https://ibb.co/MPQx6vd After having as scientifically as possible changed the variables within the fvOptions file, I still can't simulate a change in the actuator disk effect. This also happens on the unaltered turbineSiting tutorial. Is there a way I can check that fvOptions is properly being read by the solver? I have now switched to using CFDDFC on amazon's web services to run my simulations. I can confirm that there is something wrong with the mac installation files, as I can now run the simulations perfectly with my chosen geometry. Kim Last edited by KimBest; March 10, 2021 at 07:18. |
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Tags |
actuator disk, fvoptions momentum source, turbinesiting |
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