Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms.

ABSTRACT: We investigate the flow over smooth (non-ribletted) shark skin denticles in an open-channel flow using direct numerical simulation (DNS) and two Reynolds averaged Navier-Stokes (RANS) closures. Large peaks in pressure and viscous drag are observed at the denticle crown edges, where they are exposed to high-speed fluid which penetrates between individual denticles, increasing shear and turbulence. Strong lift forces lead to a positive spanwise torque acting on individual denticles, potentially encouraging bristling if the denticles were not fixed. However, DNS predicts that denticles ultimately increase drag by 58% compared to a flat plate. Good predictions of drag distributions are obtained by RANS models, although an underestimation of turbulent kinetic energy production leads to an under

SUBMITTER: Lloyd CJ 

PROVIDER: S-EPMC9890104 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature