October 6, 2018 at 1:29 pmfa-riSubscriber
I'm working with ANSYS 18.2 version,
I'm doing a 3d simulation of flow field for a 4-rotor UAV.
1.used (realizable.k-e.scalable wall fn)
2.turn on mesh motion for each blade
3.used 2 pressure outlet
4.time step size :0.01
The lift values obtained for each rotor are small and negative and The flow lines are not symmetric
please help me:
1. How do I know that my simulation is correct?
2. How to calculate the total lift and thrust values
October 8, 2018 at 5:36 amseeta guntiAnsys Employee
Regarding calculation of lift and drag, we have a tutorial in the youtube. Please watch the video as given below.
Make sure that you gave the correct input values for rotor axis direction, axis center and rotational speed ( RPM/ RPS).
October 8, 2018 at 7:46 amfa-riSubscriber
But the result is not correct by comparing values with experimental values.
and about the steamlinesThere is a lot of Wake streams.
how can i khow that my simulation is correct?
October 8, 2018 at 10:45 amseeta guntiAnsys Employee
Please make sure that you give the right boundary conditions and right axis rotation and center of axis of the rotor. Sometimes, the speed will be given wrong. Please check you use the right units.
Refer some tutorials on mesh motion with some rotational speed in Youtube to check your settings.
October 8, 2018 at 10:53 amKarthik RAdministrator
Just to add to Seeta's comments, if you are seeing discrepancies only in the coefficients (and your forces seem correct), you might want to take a look at your reference values).
October 8, 2018 at 12:10 pmfa-riSubscriber
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