Coherent structures and dynamics in a neutrally stratified planetary boundary layer flow

摘要: Coherent structures and the dynamics of a neutrally stratified planetary boundary layer flow are studied through large eddy simulation, which includes surface roughness, Coriolis force, capping inversion. Quadrant analysis visualization show that low‐speed negative momentum flux (ejection) is dominant feature throughout most layer. The initiation vortical observed to be associated with vorticity sheets pressure maxima, formed dynamically when collides either high‐speed (sweep) or mean flow. Four dimensional conditional averages used study statistical behavior ejections sweeps. shape, strength, lifetime, origin conditionally sampled at three different heights discussed. Near surface, sweeps induce colliding surface. evolution sweep‐induced near wall