Extension of the discontinuous Galerkin flow solver FLEXI towards a hybrid acoustic simulation framework (vor Ort)
* Presenting author
Abstract:
In computational aeroacoustics, hybrid simulation methods, in which the fluid flow and acoustics are solved separately, are still state of the art. However, the acoustic sources rely on an accurate prediction of the underlying hydrodynamic field. The modelling of the acoustic sources from low-fidelity simulations as RANS or URANS have their limits in complex flows. Computationally intense high-fidelity models, such as wall resolved LES, have a much higher reliability and accuracy. To close this gap between computational complexity and accuracy, one approach is to restrict the LES domain to the region of physical relevance, which requires a method to generate the necessary inflow turbulence at the LES domain boundary. In this talk, the recently introduced RRALF method is used, which relies on time-averaged flow statistics to generate turbulent fluctuations. The required data can be obtained e.g. from a RANS simulation. From the transient flow field of this zonal LES, acoustic source terms are derived and used in an acoustic solver to predict the acoustic propagation. Results of a hybrid trailing edge simulation of a NACA 64418 airfoil are presented.
