MODELLING OF BYPASS TRANSITION WITH CONDITIONED NAVIER–STOKES EQUATIONS COUPLED TO AN INTERMITTENCY TRANSPORT EQUATION

来自 EBSCO

阅读量：

作者：

展开

摘要：

A differential method is proposed to simulate bypass transition. The intermittency in the transition zone is taken into account by conditioned averages. These are averages taken during the fraction of time the flow is turbulent or laminar respectively. Starting from the Navier–Stokes equations, conditioned continuity, momentum and energy equations are derived for the laminar and turbulent parts of the intermittent flow. The turbulence is described by a classical k model. The supplementary parameter, the intermittency factor, is determined by a transport equation applicable for zero, favourable and adverse pressure gradients. Results for these pressure gradients are given.

展开

关键词：

Theoretical or Mathematical/ boundary layer turbulence boundary layers flow simulation laminar to turbulent transitions Navier-Stokes equations/ bypass transition modelling conditioned Navier-Stokes equations intermittency transport equation differential method transition zone conditioned averages turbulent flow laminar flow laminar-turbulent transition conditioned continuity equations momentum equations energy equations classical k-epsiv model supplementary parameter intermittency factor transport equation adverse pressure gradients/ A4715F Stability of laminar flows A4710 General fluid dynamics theory, simulation and other computational methods A4715C Laminar boundary layers A4725F Boundary layer and shear turbulence