DNS of Mixed Convection in Enclosed 3D-Domains with Interior Boundaries
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Engineering problems of climate control in buildings, cars or aircrafts, where the temperature must be regulated to maintain comfortable and healthy conditions, can be formulated as mixed convection problems, in which the flows are determined both by buoyancy and by inertia forces, while neither of these forces dominate. The objective of the present study is to investigate by means of Direct Numerical Simulations (DNS) instantaneous and statistical characteristics of turbulent mixed convection flows around heated obstacles which take place in indoor ventilation problems for Grashof number up to 1.0e11 and Reynolds numbers based on the height of the domain and the inlet velocity up to 1.0e5. The chosen computational domain, which is a parallelepiped with four parallelepiped obstacles inside, can be assumed as a generic room in indoor ventilation problems. The DNS of turbulent convective flows are carried out with a fourth order accurate finite volume code solving the three-dimensional incompressible Navier–Stokes equations in Boussinesq approximation.
KeywordsDirect Numerical Simulation Mixed Convection Thermal Plume Interior Boundary Fast Solver
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The authors are grateful to the Deutsche Forschungsgemeinschaft (DFG) for supporting this work.
- 1.Chorin A. J. & Marsden J. E. (1993) A Mathematical Introduction to Fluid Mechanics. Springer Series: Texts in Applied Mathematics, 4, Springer-Verlag.Google Scholar
- 3.Leonard A. & Winckelmans G. S. (1999) A tensor-diffusivity subgrid model for Large-Eddy Simulation, Caltech ASCI technical report, cit-asci-tr043, 043.Google Scholar