Author:

Keywords:

Science & Technology, Technology, Engineering, Mechanical, Engineering, FREE-STREAM TURBULENCE, BYPASS TRANSITION, EQUATION, 09 Engineering, Mechanical Engineering & Transports, 40 Engineering

Abstract:

To simulate transitional skin friction or heat transfer, the conditionally averaged Navier- Stokes equations are used. To describe the diffusion of freestream turbulence into the boundary layer and the intermittent laminar-turbulent flow behavior during transition, a turbulence weighting factor τ is used. A transport equation is presented for this τ-factor including convection, diffusion, production, and sink terms. In combination with the conditioned Navier-Stokes equations, this leads to an accurate calculation of flow characteristics within the transitional layer. The method is validated on transitional skin friction and heat transfer measurements, respectively on a flat plate and in a linear turbine cascade. © 2001 by ASME.