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Hybrid LES/URANS Simulation of Rayleigh-Bénard Convection Using BEM

Computer Modeling in Engineering & Sciences 2020年第4期123卷 1-22页

作者： Primož Kocutar Jure Ravnik Leopold Škerget Faculty of Mechanical Engineering University of MariborSmetanova 17SI-2000 MariborSlovenia

In this paper,we develop and test a unified hybrid LES/URANS turbulence model with two different Large Eddy Simulation(LES)turbulence *** numerical algorithm is based on the Boundary Element *** the existing hybrid LES/URANS turbulence model we implemented a new Smagorinsky LES turbulence *** hybrid LES/URANS turbulence model is unified,which means that the LES/URANS interface is changed dynamically during simulation using a physical *** order to define the interface between LES and unsteady Reynolds Averaged Navier Stokes(URANS)zones during the simulation,we use the Reynolds number based on turbulent kinetic energy as a switching *** means that the flow characteristics define where the sub-grid scale or URANS effective viscosity and thermal conductivity are used in the governing equations in the next time *** unified hybrid turbulence models,only one set of governing equations is used for LES and URANS *** developed hybrid LES/URANS model was tested on non-isothermal,unsteady and turbulent Rayleigh-Bénard Convection and compared with an existing model,where LES is based on turbulent kinetic *** hybrid turbulence model was implemented within a numerical algorithm based on the Boundary-Domain Integral Method,where a single domain and sub-domain approaches were *** numerical algorithm uses governing equations written in a velocity-vorticity *** false transient time scheme is used for the kinematics equation.

关键词： Boundary-domain integral method hybrid LES-RANS turbulent fluid flow heat transfer Rayleigh-Bénard Convection

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fluid flow in Continuous Casting Mold with a Configured Nozzle

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Tsinghua Science and Technology 2004年第6期9卷 617-621页

作者：王镭沈厚发柳百成 Department of Mechanical Engineering Tsinghua University Beijing 100084 China

The influence of a configured nozzle on the turbulent fluid flow in a continuous casting mold was investigated using the simulation program Visual Cast, which used the finite difference method and the SIMPLER algorithm. CAD software was used to construct the complicated nozzle in the calculational region. The simulation accuracy was validated by comparison with the classic driven cavity flow problem. The simulation results agree well with water modeling experiments. The simulations show that the velocity distribution at the nozzle port is uneven and the jet faces downward more than the nozzle outlet. Simulations with a configured nozzle and the inlet velocity at the nozzle entrance give precise results and overcome the traditional difficulty in determining the nozzle outlet velocity.

关键词： turbulent fluid flow mold nozzle continuous casting numerical simulation

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