نتایج جستجو برای: vortical layer
تعداد نتایج: 283981 فیلتر نتایج به سال:
We utilize resolvent and weakly nonlinear analyses in combination with direct numerical simulations (DNS) to identify mechanisms for oblique transition a Mach 5 hypersonic flow over an adiabatic slender double-wedge. Even though the laminar separated is globally stable, analysis demonstrates significant amplification of unsteady external disturbances linearized equations. These are introduced u...
Two-point space–time correlation and Fourier spectrum analysis are applied to large-eddy simulation results of a compressible parallel jet flow at Reynolds number 2000 Mach 0.9. Flow properties including instantaneous vortical structures, intermittency, convection velocity pressure signals in the near flow-field presented discussed. The show multi-scale features structures after transition. Hig...
We modify the standard Vicsek model to clearly distinguish between intrinsic noise due to imperfect alignment between organisms and extrinsic noise due to fluid motion. We then consider the effect of a steady vortical flow, the Taylor-Green vortex, on the dynamics of the flock, for various flow speeds, with a fixed intrinsic particle speed. We pay particular attention to the morphology of the f...
We introduce the concept of a moving \vortical projectile" (VP) to synthesize a new understanding of vortex dynamics in the vicinity of interacting nearby layers or structures of opposite-signed vorticity. In particular those layers deposited at contact surfaces when a shock or blast wave interacts with a spherical or elliptical bubble, heavier than ambient. This concept is generic to complex s...
Mixing is discussed in relation to stirring as reflected in the geometry of advected interfaces, the behaviour of fluid-element pairs and their separation rates. Stirring is different in vortical, chaotic and turbulent flows because of qualitative differences in spatio-temporal flow structure, thus giving rise to different mixing laws. Important applications of the mixing and stirring propertie...
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