Sutanu Sarkar

TL;DR: In this paper, the authors examined the modeling of the pressure-strain correlation of turbulent flows from a basic theoretical standpoint with a view toward developing improved second-order closure models and proved that for plane homogeneous turbulent flows the equilibrium structure of this hierarchy of models is encapsulated by a relatively simple model which is only quadratically nonlinear in the anisotropy tensor.

TL;DR: It is proposed that, in moderate Mach number homogeneous turbulence, the compressible component of the turbulence is in quasi-equilibrium with respect to the incompressible turbulence.

TL;DR: This work shows that the waves begin as sinusoidal disturbances rather than arising from sharp hydraulic phenomena, and reveals the existence of >200-metre-high breaking internal waves in the region of generation that give rise to turbulence levels >10,000 times that in the open ocean.

TL;DR: In this paper, a wave equation for pressure analysis of the turbulent shear layer is performed for subsonic to supersonic Mach numbers and it is found that the normalized pressure-strain term decreases with increasing Mach number, which leads to inhibited energy transfer from the streamwise to cross-stream fluctuations, to reduced turbulence production observed in DNS, and, finally, reduced turbulence levels as well as reduced growth rate of the shear layers.

TL;DR: In this paper, a direct numerical simulation of turbulent homogeneous shear flow is performed in order to clarify compressibility effects on the turbulence growth in the flow, and the stabilizing effect of compressibility on the turbulent energy growth rate is observed to be substantially larger in the DNS series where the initial value of M_g is changed.