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Title: Velocity vorticity-based large eddy simulation with the bounadr element method Ravnik, Jure (Author)Škerget, Leopold (Author)Hriberšek, Matjaž (Author) http://dx.doi.org/10.2495/AFM06027 English Unknown () 1.06 - Published Scientific Conference Contribution (invited lecture) FS - Faculty of Mechanical Engineering A large eddy simulation using the velocity-vorticity formulation of the incompressible Navier-Stokes equations in combination with the turbulent heat transfer equation is proposed for the solution of the turbulent natural convection drive flow in a 1:4 enclosure. The system of equations is closed by an enthropy-based subgrid scale model.The Prandtl turbulent number is used to estimate turbulent diffusion in the heat transfer equation. The boundary element method is used to solve the kinematics equation and estimate the boundary vorticity values. The vorticity transport equation is solved by FEM. The numerical example studied in this paper is the onset of a turbulent flow regime occuring at high Rayleigh number values ▫$(Ra=10^7-10^10)$▫. The formation of vortices in the boundary layer is observed, along with buoyancy driven diffusive convective transport. Quantitative comparison with the laminar flow model and the worh of other authors is also presented in terms of Nusselt number value oscillations. fluid mechanics, incompressible viscous fluid, turbulent flow, velocity vorticity formulation, finite element method, large eddy simulation 2006 532.5:519.61/.64 10407446 URN:SI:UM:DK:III2JMQ5 1244 18 Misc.

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## Secondary language

Language: English mehanika fluidov, nestisljiv viskozni fluid, tubulentni tok, hitrostno vrtinčna formulacija, metoda končnih elementov, simulacija