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Helicopter rotor simulation boundary conditions

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Old   February 18, 2016, 08:44
Default Helicopter rotor simulation boundary conditions
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Cameron
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Hi all,

I'm currently trying to simulate a helicopter rotor in a fashion essentially the same as in this paper:
http://task.gda.pl/files/quart/TQ200...4/tq312j-e.pdf

I'm currently using an SRF approach, basing the model off the propeller and SRFSimpleFoam mixer tutorials. The issue is I don't want to have to define a velocity for the inlet, as the point of the simulation is to compare the thrust against an experiment conducted in still air. Currently my boundary conditions are:
Inlet:
Urel = pressureInletOutletVelocity;
p = totalPressure

Outlet:
Urel = pressureInletOutletVelocity;
p = fixedValue

outer_boundary
Urel = SRFVelocity; (set to 0,0,0)
p = zeroGradient;

And a fixed value velocity of 0 on the helicopter blade. My problem is that on the inlet the relative velocity is 0 in the x and y directions, where the absolute velocity should be 0 (so the relative velocity should be rotational). Is there a better BC to use in this case? Or will I have to re-write the pressureInletOutletVelocity BC to account for a rotating reference frame? The other option would be to change to a moving mesh, but that seems unnecessary.
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Old   October 14, 2022, 08:55
Default Helicopter rotor simulation with SimpleSRF
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Ramin
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Hi,

I'm trying to run the same case with SimpleSRF. I wonder if you were able to find the appropriate BCs and ICs?
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boundary conditions, helicopter rotor, rotating reference frame, srfsimplefoam, swirl

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