The thermal conductivities of the 3D carbon nanotubes (CNTs), CNT/epoxy resin (CNT/EP) composites, graphene/EP composites and CNT/graphene/EP composites are systematically investigated via mesoscopic simulations using smoothed particle hydrodynamics (SPH) and dissipative particle dynamics (DPD). The effects of the CNT length and overall mass density on the thermal conductivity of the CNTs are discussed. Moreover, the influences of the loading and size of the fillers on the thermal conductivities of the CNT/EP, graphene/EP and CNTs/graphene/EP composites are investigated. The results have shown that introducing the CNT and graphene fillers simultaneously to the epoxy resin can improve the thermal conductivity of the composites most effectively. The study demonstrates that coupled DPD and SPH model is a viable approach to understand the thermal conductivities of nanocomposites at a reduced computational cost compared to full atomistic simulation.

3D 碳纳米管 (CNT)、CNT/环氧树脂 (CNT/EP) 复合材料、石墨烯/EP 复合材料和 CNT/石墨烯/EP 复合材料的热导率通过使用平滑粒子流体力学 (SPH) 和耗散粒子的细观模拟进行系统研究动态（DPD）。讨论了碳纳米管长度和总质量密度对碳纳米管热导率的影响。此外，还研究了填料的负载量和尺寸对 CNT/EP、石墨烯/EP 和 CNTs/石墨烯/EP 复合材料的热导率的影响。结果表明，同时向环氧树脂中引入碳纳米管和石墨烯填料可以最有效地提高复合材料的热导率。