Effect of Dual Partitions on Heat Transfer and Fluid Flow Characteristics Around a Square Cylinder Using MRT-Lattice Boltzmann Method

Abstract

In this research, a numerical study of airflow control coupled to heat transfer around a heated square cylinder is carried out at a fixed Reynolds number Re= 150. The effect of the position and length of two partitions implemented downstream of the square obstacle is examined. The numerical simulations are performed using the lattice Boltzmann method with multiple relaxation times. The results obtained are presented in the form of graphs of the isotherms, the temporal and mean drag coefficients and as a function of the mean Nusselt number. These results show that the successive inclusion of control partitions has a significant impact on the increase of the reduction percentage of drag coefficient that reaches 30.74% in a critical case. In a parallel implementation of the two partitions, this reduction percentage reaches 17.26%, with an enhancement of over 10% in heat exchange between the air and the heated obstacle's top, bottom, and rear surfaces compared to the uncontrolled case.