This paper presents a new approach for the modelling of heat transfer in 3D discrete particle systems. Using a combined finite–discrete element (FDEM) method, the surface of contact is numerically computed when two discrete meshes of two solids experience a small overlap. Incoming heat flux and heat conduction inside and between solid bodies are linked. In traditional FEM (finite element method) or DEM (discrete element method) approaches, to model heat transfer across contacting bodies, the surface of contact is not directly reconstructed. The approach adopted here uses the number of surface elements from the penetrating boundary meshes to form a polygon of the intersection, resulting in a significant decrease in the mesh dependency of the method. Moreover, this new method is suitable for any sizes or shapes making up the particle system, and heat distribution across particles is an inherent feature of the model. This FDEM approach is validated against two models: a FEM model and a DEM pipe network model. In addition, a multi-particle heat transfer contact problem of complex-shaped particles is presented.

本文提出了一种在3D离散粒子系统中进行传热建模的新方法。使用组合的有限离散元素（FDEM）方法，当两个实体的两个离散网格出现小的重叠时，可以通过数值计算接触面。固体内部和固体之间的传入热通量和导热联系在一起。在传统的FEM（有限元法）或DEM（离散元法）方法中，为了模拟跨接触体的传热，接触面不能直接重建。此处采用的方法使用了来自穿透边界网格的表面元素的数量来形成相交的多边形，从而大大降低了该方法对网格的依赖性。而且，这种新方法适用于组成粒子系统的任何大小或形状，粒子之间的热分布是模型的固有特征。此FDEM方法针对两个模型进行了验证：FEM模型和DEM管网模型。此外，还提出了复杂形状颗粒的多颗粒传热接触问题。