Convective turbulence in a cubic cavity with non-homogeneous heating at the lower boundary

The problem of heat transfer intensification using non-homogeneous boundary conditions is of great interest. This paper presents a study of the influence of non-homogeneous, non-periodic distribution of heating on the flow structure and convective heat flux for developed turbulent regimes (Ra = 1,1·109). A numerical simulation of convective turbulence was performed for non-homogeneous heating distribution at the lower boundary in the cubic cavity using open software OpenFoam 4.1. Calculations were carried out for three types of temperature distribution: localized heating at the center of the lower boundary, nine heaters of the same size, equidistant from each other, and fractal heating. All three heating distributions have the same area. The results of numerical simulation showed that in all three cases of non-homogeneous heating distribution in the cavity a large-scale circulation is formed, the dynamics and structure of which depend on the temperature distribution at the lower boundary...