Noise predictions of realistic landing gear configurations are obtained combining high-fidelity CFD simulations and the Ffowcs Williams–Hawkings (FWH) acoustic analogy. The aeroacoustic prediction such a complex aeronautical system depends on geometry fidelity ability mesh numerical method to resolve important flow features responsible for noise generation. To understand role small components i...

The Adjoint Linearised Euler Solver of Karabasov and Hynes (2006), which includes an efficient iterative solution of linearised Euler equations in the frequency domain, has been extended to a 3D framework. Numerical tests performed for the problem of sound scattering from an axi-symmetric Gaussian jet flow show a very good performance of the method for a range of frequencies and observer angles...

This work explores the aerodynamic and aeroacoustic responses of an airfoil fitted with a harmonically morphing Trailing Edge Flap (TEF). An unsteady parametrization method adapted for harmonic is introduced, then coupled dynamic meshing to drive process. The turbulence characteristics are calculated using hybrid Stress Blended Eddy Simulation (SBES) RANS-LES model. far-field tonal noise predic...

This work is a contribution to the ongoing debate about role of quadrupoles in low Mach number flows, studied through use solid and permeable surface Ffowcs-Williams & Hawkings (FW-H) integrals for landing gear numerical noise predictions. It rests upon key idea that dominance sources over volume can only be guaranteed when compact-source condition met. We propose here express this property as ...

The accurate prediction of helicopter rotor aerodynamics and aeroacoustics using Computational Fluid Dynamics (CFD) techniques still remains a challenge, as the over-dissipation numerical schemes results in higher diffusive rate wake vortices than what can be expected from fluid governing equations. To alleviate this issue, vortex feature-based vorticity confinement (FVC2-L2) method that combin...

This study aims to investigate the effects of biofouling-related roughness on a propeller's hydrodynamic and underwater radiated noise (URN) performance. Selected benchmark INSEAN E779A propeller operated in uniform & open water flow under non-cavitating cavitating conditions. The field around was first solved using RANS (Reynolds-averaged Navier Stokes) solver. Schnerr-Sauer cavitation model, ...

In the present work, an approach to obtain a design method for size of plenum chamber cross-section marine gas turbine air supply system has been investigated. Flow in ducts makes noise which is very high inlet part because large amount flow. Therefore, this phenomenon should be considered process. A suitable duct proposed (considering acoustic and aerodynamic performance at same time). method,...

This research has been carried out to determine the marine propeller hydro-acoustic characteristics by Reynolds-Averaged Navier-Stokes (RANS) solver in both uniform and non-uniform wake flow at different operating conditions Wake flow can cause changes in pressure fluctuation and gas effect on propeller noise spectrum. Noise is generated by the induced trailing vortex wake and induced pressure ...

The aerodynamic noise radiation from a side view mirror (SVM) in the high-speed airflow is calculated by the combination of unsteady incompressible fluid flow analysis and acoustic analysis. The transient flow past the generic SVM is simulated with variable turbulence model, namely DES Detached Eddy Simulation and LES (Large Eddy Simulation). Detailed velocity vectors and contour plots of the t...

The main role in reducing the noise generation of unmanned aerial vehicles is played by aeroacoustic improvement their power plant. To identify acoustic field generated rotation impeller, which used on an vehicle a quadcopter type, numerical modeling was carried out with identification turbulent structure flow using Large Eddy Simulation (LES). calculate noise, Fox Williams-Hawkings (FW-H) inte...