Benedikt Seitzer’s PhD defense

29 June 2023

Photo: UHH/MI/Lange

Congratulations to Benedikt Seitzer for his PhD with the topic “The influence of geometric model complexity on near-wall flow phenomena and their resolution in Large-Eddy Simulations”. Based on wind tunnel measurements, Benedikt examined the influence of surface roughness on flow phenomena close to the wall. The aim of the investigations was to validate the replication of near-wall turbulence at rough surfaces in large-eddy simulations (LES). Findings from both experiments indicate an underestimation of wall-normal turbulent fluxes by LES model PALM with respect to the wind-tunnel results. This difference can be significantly eliminated either by artificially increasing the roughness lengths in the surface boundary condition, by increasing the grid resolution, or by choosing scale-dependent sub-grid scale models.