for fixed wing airplanes there are many software for simulating the aerodynamic coefficients and derivatives but I don't know any software for helicopter. please introduce me the powerful software for simulating the helicopter.
I think that at this research field, we need to develop all aspects of the helicopter (i.e. the vehicle’s performance, structural and dynamic behavior, acoustics, vibration, aeroelastic stability and other phenomena). I also want to know computer softwares to predict aerodynamic, aeroacoustic, and dynamic behavior of the helicopter.
I feel you should model the helicopter on your own using Equations of Motion and Inertia, Mass, Force Moment calculations in components and then marry each of them. You can view the following reference http://jsbsim.sourceforge.net/JSBSim/classJSBSim_1_1FGRotor.html which can give a crude idea.
If you are willing to buy professional product you can buy http://www.rtdynamics.com/v3/products-services/engineering/rotorlib-fdm-for-matlabsimulink/
hi, if you want a CFD tool you can use X-Flow software. It uses mesh-less techniques therefore you can reach your goal faster than mesh based or eulerian formulation.