半球粗さ群の配置が乱流熱流動場に与える影響の直接数値解析

抄録

To investigate the influences of the roughness arrangement on the heat and mass transfer, direct numerical simulation of turbulent heat transfer over hemispherical rough walls is performed by the lattice Boltzmann method. Four types of roughness pattern are considered at the friction Reynolds number of 660 and the fluid Prandtl number of 0.71. Momentum and heat transfer are enhanced due to roughness. The augmentation of momentum transfer is larger than that of heat transfer, suggesting that the dissimilarity between the momentum and heat transfer arises.