The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests scientific industrial aeroacoustics community on a scale aeronautics activities internationally. In this context, “aeroacoustics” encompasses all aerospace acoustics related areas. Each year committee highlights some research development projects in Europe. Due effect...

The high-order spectral difference (SD) method is used for the numerical simulation of several benchmark problems in computational aeroacoustics (CAA) to assess its effectiveness. A Perfectly Matched Layer (PML) absorbing boundary condition is implemented in the SD solver to minimize artificial wave reflections at computational boundaries. The performance of PML is tested and compared with the ...

Of several iterative and direct equation solvers evaluated previously for computations in aeroacoustics, the most promising was the NASA-developed General-Purpose Solver (winner of NASA's 1999 software of the year award). This paper presents detailed, single-processor statistics of the performance of this solver, which has been tailored and optimized for large-scale aeroacoustic computations. T...

Computational aeroacoustics often use finite difference schemes optimized to require relatively few points per wavelength; such optimized schemes are often called Dispersion Relation Preserving (DRP). Similar techniques are also used outside aeroacoustics. Here the question is posed: what is the equivalent of points per wavelength for growing or decaying waves, and how well are such waves resol...

The validity of the lattice Boltzmannmethod for direct aeroacoustics simulations depends on its ability to correctly recover the equation of state of the gas and its dynamic viscosity.This paperpresents a latticeBoltzmannmethodwith two relaxation times to carry out the direct aeroacoustics simulations of a two-dimensional Gaussian sound pulse in a uniform flow over a range ofMach numbers (M) va...

The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests of the scientific and industrial aeroand related areas. Each year the committee highlights some of the research and development projects in Europe. This paper is a report on highlights of aeroacoustics research in Europe in 2010, compiled from information provided to ...

We present 3-D Large Eddy Simulation (LES) results for a turbulent Mach 0.9 isothermal round jet at a Reynolds number of 100,000 (based on jet nozzle exit conditions and nozzle diameter). Our LES code is part of a Computational Aeroacoustics (CAA) methodology that couples surface integral acoustics techniques such as Kirchhoff’s method and the Ffowcs Williams-Hawkings method with LES for the fa...

The integration of propulsion and airframe is fundamental to the design of an aircraft system. Many considerations influence the integration, such as structural, aerodynamic, and maintenance factors. In regard to the acoustics of an aircraft, the integration can have significant effects on the net radiated noise. Whether an engine is mounted above a wing or below can have a significant effect o...