Article ID Journal Published Year Pages File Type
761420 Computers & Fluids 2016 16 Pages PDF
Abstract

•High-order implementation of a transition model for turbomachinery simulations.•Coupling of the transition model with a non-standard k−ω˜ turbulence model (ω˜=lnω).•Application to zero pressure gradient flat plates and to MTU T106A turbine cascade.•Investigation of the impact of y+y+ value and grid quality on results for the turbine.

Transition modelling represents a key ingredient for improving the performances of modern turbomachinery, affecting losses and the heat-transfer phenomenon. Different methods have been proposed in the finite volume context to predict the laminar-turbulent transition, but, according to the literature, not yet for high-order methods. In this paper the transition model proposed by Kožulović and Lapworth [1] was considered, which is integral, non-local and based upon experimental correlations, takes into account all the relevant modes of transition, and is well suited for turbomachinery applications. The model was implemented into a parallel high-order accurate Discontinuous Galerkin code, named MIGALE, which allows to solve the Reynolds averaged Navier–Stokes (RANS) equations coupled with the k  -ω˜ (ω˜=log(ω)) turbulence model. The objective of this work is to show the capability of high-order DG methods in accurately computing complex transitional flows on coarse and low quality grids. The transitional flow around a flat plate (T3A and T3B configurations) and through the T106A turbine cascade has been computed up to fifth order and compared with available numerical and experimental data.

Related Topics
Physical Sciences and Engineering Engineering Computational Mechanics
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