Numerical study of mixed convection around an elliptic cylinder using immersed boundary method

The flow behind the bluff bodies is more complicated in mixed convection regime owing to the addition of buoyancy effect. In our present study fluid flow and heat transfer characteristics over elliptic cylinders of different axis ratio (AR) are investigated in mixed convection regime at Re = 100. A parametric study is also performed for higher Reynolds number, Re = 200 and Re = 500. Immersed boundary method is used to implement boundary conditions at the cylinder surface. Therefore a simple Cartesian grid is used for all our simulations. The critical Richardson number (Ric) value at which shedding is suppressed is found for different elliptic cylinders of different ARs.