卷度格子博尔兹曼方法用于热颗粒流与结合式传热热量
Xiaojie Zhang1, Donglei Wang1, Qing Li1
1Central South University, School of Energy Science and Engineering, 410083 Changsha, China.
Physical review. E
|April 18, 2025
概括
一种新的体积格子博尔茨曼 (LB) 方法使热颗粒流的粒子分辨率模拟成为可能. 这种方法准确地捕捉了联合热传递和复杂的现象,如颗粒雷利-贝纳德对流.
科学领域:
- 计算流体动力学的流体动力学.
- 多相流程 多相流程
- 热传递热量转移的方法
背景情况:
- 模拟热颗粒流与联合热传递需要准确的方法来解决粒子-流体相互作用和热交换.
- 现有的方法经常与复杂的几何形状和许多粒子的直接模拟作斗争.
研究的目的:
- 开发一个统一的,单域体积格子博尔兹曼 (LB) 方法,用于粒子解析的热颗粒流的直接数值模拟,并配热传递.
- 为了准确地建模液体动力学力,扭矩,并结合流体和粒子之间的热传递.
主要方法:
- 一种体积的LB方法,使用固体分数场来表示单个域内的粒子.
- 一个专门的动量交换方案,用于计算水力动力学相互作用.
- 一个重构的节能方程来处理联合热传递和不同的热物理性质.
主要成果:
- 该方法成功验证了数值准确性,特别是在固体-流体接口附近.
- 一个单个冷粒子的沉显示出明显的加速,减速和平衡阶段.
- 对2048个冷粒子的模拟证明了在密集的流中捕获颗粒雷利-贝纳德对流.
结论:
- 开发的体积LB方法对于粒子分辨率的热颗粒流的直接数值模拟是有效的.
- 这种方法准确地捕获了稀释和密集系统中的联合热传递和复杂的流动行为.
- 这种方法为研究粒子对流等现象提供了强大的工具.
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