Large-eddy simulations of adverse pressure gradient turbulent boundary layers

2nd Multiflow Summer School on Turbulence

Bobke, Alexandra^1 ; Vinuesa, Ricardo^1 ; Örlü, Ramis^1 ; Schlatter, Philipp^1

Linné FLOW Centre, KTH Mechanics, Stockholm, Sweden^1

关键词: Adverse pressure gradient;    Energy budgets;    Inflow conditions;    Near-wall region;    Power-law coefficients;    Reynolds stress;    Turbulent boundary layers;    Zero pressure gradient;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/708/1/012012/pdf
DOI  :  10.1088/1742-6596/708/1/012012

来源: IOP

【 摘 要 】

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 of turbulent boundary layers with two 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 show that more energy is transported from the near-wall region to farther away from the wall.