Numerical Computation of Turbulent Shear Flows

TLDR: In this article, the authors describe the simulations of turbulent shear flows by direct numerical solution of the three-dimensional Navier-Stokes equations, the dynamical equations, and boundary conditions employed with particular emphasis on the momentum less wake model.

Abstract: Publisher Summary This chapter describes the simulations of turbulent shear flows by direct numerical solution of the three-dimensional Navier-Stokes equations, the dynamical equations, and boundary conditions employed with particular emphasis on the momentum less wake model The numerical computation approach provides several advantages over more conventional approaches—the complete flow field is obtained at all times so that detailed flow characteristics may be obtained that would be difficult to measure in the laboratory, and the initial conditions can be accurately controlled so that their effect may be determined The technique of imposing the initial conditions allows arbitrary mean velocity profile, turbulence intensity profile, and local turbulence energy spectrum The present simulations of turbulent shear flows are a first step toward proper understanding of the basic mechanisms and dynamics of these flows Detailed comparisons and tests are presently underway between various turbulence modeling hypotheses, laboratory experiments, and the present simulations As time and the art of numerical simulation progress, simulations like the present ones should be expected to fulfill more and more need of a laboratory workhorse