Numerical Study of the Effect of Mean Three-Dimensionality on Turbulence in Adverse-Pressure-Gradient Boundary Layers

Coleman, G N ; Rumsey, C L ; Spalart, P R

关键词: DIRECT NUMERICAL SIMULATION;    LEADING EDGES;    PRESSURE GRADIENTS;    REYNOLDS EQUATION;    REYNOLDS STRESS;    SWEPT WINGS;    THREE DIMENSIONAL BOUNDARY LAYER;    TURBULENCE MODELS;    TURBULENT BOUNDARY LAYER;    UPSTREAM;   

RP-ID  :  NASA/TM-2019-220273,L–21014,NF1676L-32854

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Direct numerical simulation (DNS) is used to isolate the influence of sweep on a separating turbulent boundary layer. Attention here is limited to the behavior of the turbulence within the adverse-pressure-gradient (APG) region upstream of separation. Other regions and quantities are considered in Coleman, Rumsey & Spalart. The mean three-dimensionality and outer-layer inviscid skewing have only a slight effect upon the structure of the turbulence (measured by the relationship of the components of the Reynolds-stress tensor and the efficiency of the turbulence energy transfer) compared with that of the adverse pressure gradient, which dominates both the skewed and unskewed layers.