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Turbulence in hoover helicopter (velocity at inlet=0) |
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April 11, 2014, 03:45 |
Turbulence in hoover helicopter (velocity at inlet=0)
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#1 |
New Member
Join Date: Oct 2013
Posts: 12
Rep Power: 12 |
Dear all,
I am currently trying to model the flow generated by a rotating helicopter blade in hoover, using rhoPimpleFoam. My mesh is a structured mesh, generated using hyperMesh. I have these boundaries: - Inlet (face z=zmax), rotor, outlet (z=zmin), symetry 1 and 2 and freeStream. My first problem (but I think it is solved) is to correct generate the rotating zone. For this, I used the topoSet dict using these option: name rotor_zone; type cellSet; action new; // source boxToCell; source cylinderToCell; sourceInfo { // box (0.0 -2.0 3.0) (0.76 2.0 5.0); p1 (0.0 0.0 -5.0); p2 (0.0 0.0 5.0); radius 7.5; } } { name rotor_zone; type cellZoneSet; action new; source setToCellZone; sourceInfo { set rotor_zone; } Then I used the option setsToZone -noFlipMap to generate the rotor zone. In a second time, I extract all face of my rotor zone: name rotor_zone; type faceSet; action new; source cellToFace; sourceInfo { set rotor_zone; option all; } Finally, I generated the boudary using: ( { name rotor_zone; type faceSet; action delete; source boundaryToFace; sourceInfo { } } Do you agree with thise methode for generating the rotating zone? Using rhoPimpleFoam without turbulence (laminar flow), I obtained a correct agreement between CFD and measurements. (Mach number=0.89). My problem now is to model the turbulence and to run a RANS simulation. In fact, because I try to model a hoover flight, I have a zero velocity at the inlet. So I don't know how to initialize the turbulence. Should I consider the freeStream velocity as the mean velocity of the rotor? I have studied the mixerVessel tutorial. They model a rotating flow with empty inlet and outlet conditions. I don't understand how they find k and epsilon value. Does anybody have an idea how to solve this problem? Thanks you very much, Best regards, Martin. You will find 0 folder attached and topoSet files. |
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April 23, 2014, 05:19 |
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#2 |
New Member
Join Date: Oct 2013
Posts: 12
Rep Power: 12 |
Nobody has any idea? I have tried severals boundaries conditions and I have not obtained any converged solution,
Best regards, |
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