Gholamreza Imani

The LB simulation of forced convection from a porous cylinder in crossflow with a curved interface based on the two-domain approach has not been studied yet. This study aims at lattice Boltzmann (LB) simulation of the fluid flow and heat transfer characteristics of a heated porous elliptic cylinder in crossflow following the two-domain approach. In the present research, the effect of axis ratio (1≤AR≤2), Reynolds number (5≤Re≤40), and Darcy number (10^(-4)≤Da≤10^(-2)) are studied. To perform the LB simulation based on the two-domain approach, the non-equilibrium extrapolation method is modified to model the thermal compatibility conditions required at the curved porous-fluid interface. The results show that the axis ratio, as well as Reynolds and Darcy numbers significantly, affect the hydrodynamic and thermal characteristics of the porous elliptic cylinder. It is shown that for AR>1 the phenomenon of detached wake occurs at much higher Darcy numbers compared to the case of the porous circular cylinder (AR=1). The results show that the location of maximum temperature within the cylinder moves downstream when Reynolds number, Darcy number, and axis ratio increase. It is also concluded that the average Nusselt number of a porous elliptic cylinder is always lower than that of a porous circular cylinder for the range of parameters investigated here.