Numerical modelling of bypass transition in turbine cascades

0451430 - ÚT 2016 eng C - Conference Paper (international conference)
Louda, P. - Příhoda, Jaromír - Kozel, K.
Numerical modelling of bypass transition in turbine cascades.
The 16th International Conference on Fluid Flow Technologies. Budapest: Budapest University of Technology and Economics, 2015.
[International Conference on Fluid Flow Technologies/16./. Budapest (HU), 01.09.2015-04.09.2015]
R&D Projects: GA ČR GAP101/12/1271
Institutional support: RVO:61388998
Keywords : 3D turbine cascade * bypass transition model * EARSM turbulence model
Subject RIV: BK - Fluid Dynamics

The work deals with numerical simulation of turbulent flows in turbine cascades taking into account transition to turbulence. The mathematical model is based on Favre-averaged Navier-Stokes equations closed by a turbulence model. The transition to turbulence is modelled by 2-equation model of Lodefier and Dick (2006) solving equations for intermittency and free-stream factor. In the model, arbitrary transition criteria based on empirical correlations can be used. The turbulence model is the EARSM (explicit algebraic Reynolds stress model). The results are shown for 3D turbine cascade with prismatic geometry and side walls. Fully turbulent and transitional simulations are compared. The implementation of the transition model in the multi-block grids enabling computation of boundary layer thickness and free-stream velocity and turbulence is discussed. The numerical method uses the implicit finite volume solver with the AUSM-type scheme.
Permanent Link: http://hdl.handle.net/11104/0254395