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APPLICATIONS: Electronics and Acoustics

Numerical modelling of noise generated by turbulent flows

Faranosov Georgy
Central Aerohydrodynamic Institute

DRIVER: Develpment of numerical modelling of noise generation processes in turbulent flows (jets, wakes, fans etc.)

STRATEGY: For turbulent flows modellilng (including noise generation processes), a method based on Large Eddy Simulation (LES) approach is used. The LES method is realized on basis of CABARET numerical scheme. Acoustic module is based on the integral Ffowcs Williams-Hawkings approach with the use of Green's function for convective wave equation

OBJECTIVE: As a result of numerical modelling, aerodynamic (mean parameters profiles, TKE distributions) and aeroacoustic (far field spectra) characteristics should be obtained for turbulent flows considered

IMPACT: Successful numerical modelling of aeroacoustic processes taking place in turblent flows will allow performing deeper analisys of the physical mechanisms in these flows, which in turn will make it possible to develop noise reduction techniques with the use of elaborated numerical methods as well

USAGE: aviation scientific centers and design bureaus

AREA: Radiophysics, Electronics and Acoustics, Mechanics

Mach stem formation in the process of high intensive ultrasound focusing

Khokhlova Vera
Moscow State Uiversity

DRIVER: Development the theory of shock wave interaction for acoustic fields and resolving the Von Neumann paradox

STRATEGY: Numerical modeling of ultrasound fields of high-intensity medical transducer within a wide range of parameters

OBJECTIVE: Characterization of shock fronts spatial structures in the focal area of the acoustic fields of high-intensity medical transducers

IMPACT: Development of the shock front interaction theory

USAGE: Characterization the shock front structures in the focal area of high-intensity transducers used pulsed and periodic waves

AREA: Radiophysics, Electronics and Acoustics

Numerical Solution of Integral Equations

Setukha Aleksey
Moscow State Uiversity

DRIVER: Development of effective numerical methods of solving integral equations.

STRATEGY: Application of effective methods of large size matrix approximation and using parallel algorithm model for numerical schemes

OBJECTIVE: The solution of boundary value problems for elliptic equations in the domains with complex geometry with use of boundary integral equation methods

IMPACT: Development of parallel algorithms of external boundary value problems of elliptic equations in the domains with complex solution

USAGE: Aerodynamics vortex methods, external problems of acoustic and electrodynamics

AREA: Radiophysics, Electronics and Acoustics