Publication de 6 numéros par an
ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554
Indexed in
AN ADAPTIVE FINITE ELEMENT METHOD WITH DYNAMIC LES FOR TURBULENT REACTIVE FLOWS
RÉSUMÉ
A Vreman dynamic subgrid scale (SGS) large eddy simulation (LES) model is implemented in a predictor-corrector split h-adaptive finite element method (FEM) for modeling combustion. The use of h-adaptation provides a measurement of the actual error in the discretization, and can adjust spatial accuracy to control the error. By utilizing the dynamic model, laminar or turbulent flow can be automatically calculated. In this study, we try to validate this Vreman SGS LES model in just the fluid dynamics system by assuming all species are air and all results are compared with experimental data and RANS k − ω model. The model is tested by solving an 18° ramp at a Mach number of 2.25 as well as unsteady turbulent flow over a backward-facing step. The high Mach number ramp demonstrates the ability of the model to capture shocks and shock-wave/boundary layer interactions. In the high Reynolds number backward-facing step, large eddies are resolved without the requirement of a fine mesh, in contrast to DNS, although it is finer than a RANS model would require. The reattachment length and instantaneous flow results compare well with published simulations and experimental data.
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Waters Jiajia, Carrington David B., Francois Marianne M., Modeling multiphase flow: Spray breakup using volume of fluids in a dynamics LES FEM method, Numerical Heat Transfer, Part B: Fundamentals, 72, 4, 2017. Crossref
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Waters Jiajia, Carrington David B., Wang Xiuling, Pepper Darrell W., A Dynamic LES Model for Turbulent Reactive Flow with Parallel Adaptive Finite Elements, in Energy for Propulsion, 2018. Crossref
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Waters Jiajia, Carrington David B., Modeling MultiPhase Flow: Spray Break-up Using Volume of Fluids in a dynamic LES FEM method, 2018 AIAA Aerospace Sciences Meeting, 2018. Crossref
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Waters Jiajia, Carrington David B., Turbulent Reactive Flow Modeling in Engines: Simulating Engine Dynamics Using fearce, Journal of Engineering for Gas Turbines and Power, 142, 2, 2020. Crossref