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Evaluation of Turbulence Models in Predicting Hypersonic and Subsonic Base Flows Using grid adaptation Techniques

Chinese Journal of Aeronautics 2012年第3期25卷 325-334页

作者： YOU Yancheng BUANGA Bjorn HANNEMANN Volker LUDEKE Heinrich Institute of Aerodynamics and Flow Technology German Aerospace Center (DLR) Braunschweig 38108 Germam Institute of Aerodynamics and Flow Technology German Aerospace Center (DLR) Gottingen 37073 Germany Department of Aeronautics Xiamen University Xiamen 361005 China

The flows behind the base of a generic rocket, at both hypersonic and subsonic flow conditions, are numerically studied. The main concerns are addressed to the evaluation of turbulence models and the using of grid adaptation techniques. The investigation focuses on two configurations, related to hypersonic and subsonic experiments. The applicability tests of different turbu- lence models are conducted on the level of two-equation models calculating the steady state solution of the Reynolds-averaged Navier-Stokes（RANS） equations. All used models, the original Wilcox k-co, the Menter shear-stress transport （SST） and the ex- plicit algebraic Reynolds stress model（EARSM） formulation, predict an asymmetric base flow in both cases caused by the support of the models. A comparison with preliminary experimental results indicates a preference for the SST and EARSM results over the results from the older k-co model. Sensitivity studies show no significant influence of the grid topology or the location of the laminar to turbulent transition on the base flow field, but a strong influence of even small angles of attack is reported from the related experiments.

关键词： base flows turbulence models steady calculation grid adaptation numerical simulation

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Challenges and Technologies in ReservoirModeling

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Communications in Computational Physics 2009年第6期6卷 1-23页

作者： Larisa V.Branets Sartaj S.Ghai Stephen L.Lyons Xiao-Hui Wu ExxonMobil Upstream Research Company 3120 Buffalo SpeedwayHoustonTX 77098USA

Reservoir modeling is playing an increasingly important role in developing and producing hydrocarbon *** this paper,we provide a brief overview of some main challenges in reservoir modeling,i.e.,accurate and efficient modeling of complex reservoir geometry and heterogeneous reservoir *** then present modeling techniques we recently developed in addressing these challenges,including a method for generating constrained Voronoi grids and a generic global scale-up *** focus on the Voronoi gridding method,which is based on a new constrained Delaunay triangulation algorithm and a rigorous method of adapting Voronoi grids to piecewise linear *** global scale-up method based on generic flows is briefly *** examples are provided to demonstrate the techniques and the advantage of combining them in constructing accurate and efficient reservoir models.

关键词： Reservoir modeling grid generation grid adaptation global scale-up

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