Rapid distortion theory as a means of exploring the structure of turbulence

摘要: Turbulence structure is discussed in terms of the different length scales a turbulent flow—the large scale motions characteristic boundary conditions and forcing particular flow and, for high Reynolds numbers, universal small motions. Evidence presented that shear flows near boundaries many similar. The analysis understanding types regions flows, their sensitivity to initial conditions, clarified by using classification “rapidly changing turbulence” (RCT) “slowly (SCT), according whether time (T D) over which fluid particles pass through (or near) changes mean or much less greater than turbulence L). It noted all unconfined adjusts so that, T D ~ L, implies some features can persist throughout flow. A possible physical explanation suggested.