Turbulent Natural Convection within an Enclosure with Some Obstacles

The aim of this work is to study turbulent naturalconvection of a heated body inside an air filled squareenclosure at Ra = 1012. A CFD code has been developed toinvestigate the effects of aspect ratio and position of thebody on heat transfer inside the cavity. An approximatedsituation of the body at which a minimum heat transferoccurs is desired. Two-dimensional Reynolds-averagedNavier-Stokes equations besides k  turbulence modelbased on standard wall functions are employed to simulatethe problem. The equations are discretized using finitevolume method in a staggered grid, pressure and velocityare coupled with SIMPLE algorithm and the final systemsof algebraic equations are solved by Strongly ImplicitMethod. The results indicate that the temperature field ishighly stratified and 34.9 percent of heat transfer reductionis observed by horizontal installation of the body at upperleft hand side of the enclosure.

کلیدواژه ها:

Natural Convection ، Turbulence ، Numericalsolution ، Enclosure ، Interior body