Print Email Facebook Twitter Scaling and modelling of turbulence in variable property channel flows Title Scaling and modelling of turbulence in variable property channel flows Author Pecnik, Rene (TU Delft Energy Technology) Patel, A. (TU Delft Energy Technology) Date 2017 Abstract We derive an alternative formulation of the turbulent kinetic energy equation for flows with strong near-wall density and viscosity gradients. The derivation is based on a scaling transformation of the Navier-Stokes equations using semi-local quantities. A budget analysis of the semi-locally scaled turbulent kinetic energy equation shows that, for several variable property low-Mach-number channel flows, the 'leading-order effect' of variable density and viscosity on turbulence in wall bounded flows can effectively be characterized by the semi-local Reynolds number. Moreover, if a turbulence model is solved in its semi-locally scaled form, we show that an excellent agreement with direct numerical simulations is obtained for both low- and high-Mach-number flows, where conventional modelling approaches fail. Subject compressible boundary layersturbulence modellingturbulent boundary layers To reference this document use: http://resolver.tudelft.nl/uuid:a0bd1502-d95b-497d-b873-1205d408170b DOI https://doi.org/10.1017/jfm.2017.348 Embargo date 2018-01-25 ISSN 0022-1120 Source Journal of Fluid Mechanics, 823 Bibliographical note Accepted Author Version Part of collection Institutional Repository Document type journal article Rights © 2017 Rene Pecnik, A. Patel Files PDF PecnikPatel.pdf 519.52 KB Close viewer /islandora/object/uuid:a0bd1502-d95b-497d-b873-1205d408170b/datastream/OBJ/view