A novel immersed boundary lattice Boltzmann method (IB-LBM) is proposed to simulate the complex thermal particle flows. In the present scheme, the boundary condition is directly implemented by correcting the distribution function at the neighboring points around the interface, similar to the original LBM. Furthermore, an adjustment parameter is introduced for ensuring the accuracy in the boundary treatment. Those two improvements both facilitate the alleviation of computational load, for evaluation and incorporation of the boundary force and the iterative procedure involved in the previous methods. Three simulations of complex thermal flows with moving boundary, including the mixed convection in a cavity containing a rotating cylinder, the sedimentation of a cold particle in a hot fluid and the drafting-kissing-tumbling dynamics of two hot settling particles in a vertical channel are performed to validate the present IB-LBM for. The results are found to have good agreement with those available in the literature.

提出了一种新型的浸没边界格子玻尔兹曼方法（IB-LBM）来模拟复杂的热粒子流。在本方案中，类似于原始LBM，通过校正界面周围相邻点的分布函数来直接实现边界条件。此外，引入调整参数以确保边界处理的准确性。这两方面的改进都有助于减轻计算负荷，以评估和合并边界力以及先前方法中涉及的迭代过程。具有边界移动的复杂热流的三种模拟，包括在包含旋转圆柱体的空腔中的混合对流，进行了热流体中冷颗粒的沉降以及垂直通道中两个热沉降颗粒的牵伸-跳动动力学，以验证本IB-LBM的有效性。发现结果与文献中的结果具有良好的一致性。