“Aeroacoustics: Jet and Combustion Noise; Duct Acoustics” and “Aeroacoustics: Fan, Stol, and Boundary Layer Noise; Sonic Boom; Aeroacoustics Instrumentation” (Volumes 37 and 38 of Progress in Aeronautics and Astronautics)

Cfd-analysis of Fan Aeroacoustics - Comparative Studies

The need of aeroacoustically highefficient fans requires more detailed investigations of three dimensional effects and separated flow analysis. Comprehensive studies and code validation for fans have shown, that further development especially for the influence of sweep -is necessary. Therefore, two different Navier-Stokes Codes, a lifting surface code and a classical method for 3-D cascade flow...

Aeroacoustics Research in Europe

Recent Advances in Aeroacoustics

Acoustics is one of the oldest examples of applied research, long before the term was even coined: witness the concept of musical scales by the ancient Greeks and the construction of musical and other sound instruments in most civilizations through the ages. Compared with sound in the strict sense of small pressure perturbations in a homogeneous, non-dissipative medium at rest, modern aeroacous...

Boundary element and finite element coupling for aeroacoustics simulations

We consider the scattering of acoustic perturbations in a presence of a flow. We suppose that the space can be split into a zone where the flow is uniform and a zone where the flow is potential. In the first zone, we apply a Prandtl–Glauert transformation to recover the Helmholtz equation. The well-known setting of boundary element method for the Helmholtz equation is available. In the second z...

patterns and variations in native and non-native interlanguage pragmatic rating: effects of rater training, intercultural proficiency, and self-assessment

although there are studies on pragmatic assessment, to date, literature has been almost silent about native and non-native english raters’ criteria for the assessment of efl learners’ pragmatic performance. focusing on this topic, this study pursued four purposes. the first one was to find criteria for rating the speech acts of apology and refusal in l2 by native and non-native english teachers...