Leading-edge (LE) serrations on owls’ outermost remiges play a crucial role in the silent flight of owls. While aeroacoustic characteristics LE have been widely studied using single feathers/airfoils, how they affect feather–feather (feather slots) interactions during remains unclear. Here, we present numerical analysis effects owl-inspired aeroacoustics tandem wing models. Large-eddy simulatio...

In order to study the aerodynamic noise on surfaces of high-rise buildings under action strong winds, this paper numerically simulated sound pressure field surface a building using large-eddy simulation method combined with acoustic analog FW-H (Ffowcs Williams–Hawkings) equation and obtained intensity radiation distribution further identify area maximum thus achieve purpose locating source. Th...

In this paper, direct numerical simulations are performed for low-speed flows past a NACA0012 aerofoil at high incidence angles. The aim is to investigate the significance of quadrupole noise generated due separated shear layers, in comparison dipole emanating from surface. two different components (dipole and quadrupole) calculated by using Ffowcs Williams & Hawkings method approaches: one...

The method of combining incompressible hybrid Reynolds average Navier–Stokes/large eddy simulation (RANS/LES) with an acoustic perturbation equation was studied to accurately predict the flow and noise performances in NASA tandem cylinder experiments. In this approach, waves simultaneously propagate time domain unsteady turbulent flow. experiment performed under condition a number 1.66 × 105, b...

Heated transitional supersonic jets exhausting from a rectangular nozzle at over-expanded conditions are investigated by Large Eddy Simulations and Ffowcs-Williams Hawkings acoustic analogy. Four cases with fixed pressure ratio but different temperature ratios (TR) of 1.0, 2.0, 4.0, 7.0 analyzed. Numerical results show that the increasing jet velocity significantly increases, whereas its Reynol...

The aim of the paper is to predict hydrodynamic performance and noise generated by propeller at different advance ratio speed propeller. Three bladed, DTMB 4119 model was created using NACA66 modified line, a = 0.8 hydrofoil profile. ANSYS Workbench software used for mesh generation computational analysis. A large-eddy simulation turbulence Ffowcs Williams-Hawkings (FWH) acoustic all simulation...

Noise radiated from flow past different configurations of the half-round mirror (HRM) mounted on a plate has been investigated using computational aeroacoustics (CAA). The stress-blended eddy simulation (SBES), together with Ffowcs Williams–Hawkings (FW–H) acoustic analogy, was employed to predict near-field and far-field noise, respectively. numerical methodology verified validated for standar...

We study noise generation at the blade tips of propellers designed for future electric aircraft propulsion and, furthermore, analyze interrelationship between mitigation and aerodynamics improvement in terms propeller geometric designs. Classical with three or six blades a conceptual joined dual-blades are compared to understand effects tip vortices on aerodynamics. The dual is constructed by j...

The last decade has seen an exponential interest in conventional and unconventional energy issues. This trend also extended to road transport issues is driven by expectations minimize fuel and/or consumption negative environmental impact. In the global literature, much attention focused on work of autonomous transport, both passenger trucks, phenomena platooning. paper presents original aerodyn...

This study investigates the effects of grid resolution on hydroacoustic performance benchmark INSEAN E779A propeller operated in uniform flow, open water and non-cavitating conditions. In numerical calculations, an incompressible hydrodynamic solver together with porous FW-H (Ffowcs-Williams Hawkings) equation is used to predict URN (Underwater Radiated Noise). The first aim within this explore...