This paper describes a revolutionary, fully-integrated approach for modeling the noise characteristics of maneuvering rotorcraft. The primary objective of this effort is the development of a physics-based software tool that enables the design of quiet rotors without performance penalties. This tool shall accurately predict the rotorcraft flight state and rotor trim, the unsteady aerodynamic loa...

Perform numerical analysis of sound generation and propagation with accuracy and with lower computational time are some of the main challenges for Computational Aeroacoustics (CAA), which had experienced some major improvements in the last decade. In the present work it was performed numerical study of two-dimensional propagation of waves by solving LEE equations applied to a Gaussian pulse in ...

The noise generated by a quadrotor biplane unmanned aerial system (UAS) is studied computationally for various conditions in terms of the UAS pitch angle, propellers rotating velocity (RPM), and speed to understand physics involved its aeroacoustics structure-borne noise. k-ω SST turbulence model Ffowcs Williams-Hawkings equations are used solve flow acoustics fields, respectively. sound pressu...

In this paper, the aerodynamic characteristic of a ducted tail rotor in hover has been numerically studied using CFD method. An analytical time domain formulation based on Ffowcs Williams-Hawkings (FW-H) equation is derived for the prediction of the acoustic velocity field and used as Neumann boundary condition on a rigid scattering surface. In order to predict the aerodynamic noise, a hybrid m...

High-fidelity large-eddy simulations (LESs) are performed to investigate aeroacoustic characteristics of jets issuing from twin rectangular nozzles with an aspect ratio 2:1 at two overexpanded conditions and the design condition. For all three jet simulated, LES predicts qualitatively similar near-field flow statistics those measured University Cincinnati. Using Ffowcs Williams-Hawkings method,...