High-order implementation of a non-local transition model in a DG solver for turbomachinery applications

作者：Lorini M^*; Bassi F; Colombo A; Ghidoni A

来源：Computers & Fluids, 2016, 127: 115-130.

DOI：10.1016/j.compfluid.2015.12.009

• RANS equations
• Discontinuous Galerkin
• Laminar-turbulent transition
• Intermittency
• Multimode model

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 Koiulovie 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-(omega) over tilde) ((omega) over tilde = log(omega)) 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.

• 出版日期2016-3-20