Aeroacoustic study of a forward facing step using linearized Euler equations

We present a hybrid approach for computational aeroacoustics in the time domain. The flow field is computed using large eddy simulation and coupled to the acoustic propagation solver based on linearized Euler equations. Coupling in the time domain avoids storage of large flow field volume data, avoiding the slow hard disk access rate and hence speeding up the computation. Acoustic sources are calculated on the fine fluid grid and interpolated conservatively onto the coarse acoustic grid. The problem studied is flow-induced noise from flow over a forward facing step and the Reynolds number based on the height of the step (H=12mm) is ReH≈8000. The sound pressure levels obtained compare well with the published results.