Detached Eddy Simulation of Separated Flow on a High-Lift Device and Noise Propagation

Abstract

In the framework of the German research project FREQUENZ, a joint effort of industry, research establishment and universities has been undertaken to study the effect of design variations on aeroacoustics of a simplified high lift configuration. The flow past an airfoil with small trailing edge devices (MiniTED) was investigated numerically for the case of a generic landing configuration. Because of the turbulent and separated flow character behind the high lift device a hybrid RANS-LES approach was chosen to investigate the flow phenomena. Furthermore, the noise in the turbulent flow field was investigated by evaluating the pressure distribution. As a large measurement campaign has been undertaken within FREQUENZ, it is possible to validate the aerodynamic and the aeroacoustic results.

Pressure analysis in a compressor cylinder based on detached eddy simulation and dynamic mesh

“…The LES approach is frequently used to the flow analysis associated with noise, 7,8 but the computing-cost is not favorable enough to the flow with complicated turbulence and geometry. In the present work, we focus on the pressure pulsations and the flow structure in the cylinder of a rolling piston compressor using detached eddy simulation (DES), 9,10 which well combines RANS and LES technology, and dynamic mesh. Numerical simulation is based on ANSYS-CFX software platform, and the results are in agreement with the pressure pulsations under an actual operating condition in the frequency band of 1000-2900 Hz.…”