一种改进的格子玻尔兹曼方法及其在流固耦合传热问题中的应用

A Distribution Function Correction-based Immersed Boundary-lattice Boltzmann Method and Its Application in Natural Convections with Fluid-structure Interaction for Heat Transfer Improvement

含热源颗粒的方腔自然对流是一种常见的流固耦合热流动问题.本文提出一种使用分布函数修正的浸没边界格子玻尔兹曼方法来处理流固耦合和流场及温度场耦合问题,并把该方法运用到含移动热源颗粒的方腔自然对流的数值模拟中,分析了方腔内的速度,温度,热源颗粒的轨迹和受力,探究其热源颗粒对传热机理的改善,解决了含热源的自然对流情况下流固耦合传热问题.

Natural convections with heated particles inside are very common for thermal fluid-structure interaction. In this paper, a distribution function correction-based immersed boundary-lattice Boltzmann method（LBM）is presented for thermal fluid-structure interaction（FSI）problems. The idea of the present work comes from the intrinsic feature of LBM, which uses the density distribution function as a dependent variable to evolve the flow field. This distribution function correction method keeps the merits of the original LBM, and its implementation is still simple, straightforward and efficiency. A systematic study of a natural convection with moving heated circle particles inside a square cavity is carried out to demonstrate its capability. The velocity and temperature of the flow field, the routes and forces of the particles are obtained to analyze the influence of the particles on heat transfer. Moreover, it is found that adding moving particles in the natural convection flows in a square cavity enhances heat transfer of the flows.