Direct Numerical Simulation of a Rotor at Re=10000 and Analysis of Acoustic Sources
DescriptionThis presentation describes the work that was performed as part of the Centre of Excellence Excellerat Phase 1, where a Direct Numerical Simulation (DNS) of a relatively complex four-bladed rotor at a tip-Reynolds number of 10000 was performed. The emphasis is on the workflows necessary for high-order simulations of industrially relevant configurations. The simulation is based on the spectral element solver, Nek5000 which ensures high fidelity of the arising flow structures throughout the domain. An initial hexahedral coarse mesh is constructed using Gmsh, which is then refined using an automatic Adaptive Mesh Refinement (AMR) strategy. We will describe the workflow that was adopted to perform these simulations, and show selected statistics of the case, both in the transient and stationary regime. In a second part, we will show work towards using these incompressible data to extract the acoustic sources, and subsequently make predictions of the acoustic noise from the rotor. This is achieved by calculating the integral solution of the thickness and loading terms of the Ffowcs Williams and Hawkings equation. Moreover, we present the analysis of acoustic source terms using different Aeroacoustic analogies.
TimeTuesday, June 2717:00 - 17:30 CEST