Large-eddy simulations of adverse pressure gradient turbulent boundary layers
(English)Manuscript (preprint) (Other academic)
Adverse pressure-gradient (APG) turbulent boundary layers (TBL) are studied by performing well-resolved large-eddy simulations. The pressure gradient is imposed by defining the free-stream velocity distribution with the description of a power law. Different inflow conditions, box sizes and upper boundary conditions are tested in order to determine the final set-up. The statistics ofturbulent boundary layers with three different power-law coefficients and thus magnitudes of adverse pressure gradients are then compared to zero pressure-gradient (ZPG) data. The effect of the APG on TBLs is manifested in the mean flow through a much more prominent wake region and in the Reynolds stresses through the existence of an outer peak. The pre-multiplied energy budgets shows the APG influence on the distribution of the turbulent kinetic energy transfer mechanism across the boundary layer.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-185271OAI: oai:DiVA.org:kth-185271DiVA: diva2:919837
QS 20162016-04-152016-04-152016-04-18Bibliographically approved