Compressibility may strongly reduce the redistribution of turbulent kinetic energy. The question of how such effects can be taken into account in turbulence models is addressed here. First, a corresponding stochastic turbulence model is developed on the basis of a simplification of the generalized Langevin model for turbulent velocities. This model is then reduced to a deterministic model that ...

After a brief summary of experimental results focussed on plane Couette flow and contrasting the low-Reynolds numbers transition between laminar flow and the turbulent spot regime, with its high-Reynolds counterpart between homogeneous turbulence and turbulent stripes, we introduce a hierarchy of models from conceptual models designed to answer the most basic questions to semi-realistic models ...

We present an investigation of velocity fields in early to late M-type hydrodynamic stellar atmosphere models. These velocities will be expressed in classical terms of microand macroturbulent velocities for usage in 1D spectral synthesis. The M-star model parameters range between logg of 3.0 – 5.0 and Teff of 2500 K – 4000 K. We characterize the Teffand logg-dependence of the hydrodynamical vel...

In this paper, the problem of turbulent forced convection flow of water- alumina nanofluid in a uniformly heated pipe has been thoroughly investigated. In numerical study, single and two-phase models have been used. In single-phase modeling of nanofluid, thermal and flow properties of nanofluid have been considered to be dependent on temperature and volume fraction. Effects of volume fraction a...

Prior to the 2001 CMER pilot study, several TFW cooperators conducted independent field studies of the distribution of perennial and seasonal headwater streams (Table 1). All of the studies were conducted during the summer low flow seasons of 1998 or 2000, in part, to evaluate proposed regulatory guidelines that differentiate non-fish-bearing headwater streams on the basis of the seasonal flow ...

Cascade models based on dynamical complex networks are proposed as of the turbulent energy cascade. Taking a simple shell model initial regular lattice with only nearest neighbor interactions, small world network constructed by adding or replacing some existing local interactions nonlocal ones. The then evolved over time, both solving for velocity variable using an arbitrary generalization evol...