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PM-IBM model for windbreak and its application in simulation of turbulence in dust suppressing areas of storage yards[J].计算力学学报,2020,37(5):577~584

PM-IBM model for windbreak and its application in simulation of turbulence in dust suppressing areas of storage yards
PM-IBM model for windbreak and its application in simulation of turbulence in dust suppressing areas of storage yards

DOI：10.7511/jslx20190621001

 作者 单位 E-mail 许栋 天津大学 水利工程仿真与安全国家重点实验室, 天津 300072 xudong@tju.edu.cn 张博曦 天津大学 水利工程仿真与安全国家重点实验室, 天津 300072 及春宁 天津大学 水利工程仿真与安全国家重点实验室, 天津 300072 杨海滔 天津大学 水利工程仿真与安全国家重点实验室, 天津 300072

防风网是煤炭和矿石等物料堆场的重要抑尘设施，能够利用多孔网板形成风速庇护效应，减少扬尘带来的大气污染。基于计算流体力学的数值风洞是预测防风网减风抑尘效率的先进手段，然而网板边界模型及其复杂阻风作用机制一直是风场湍流模拟的难点。本文将浸入边界法与多孔介质模型相结合，通过在NS方程中引入与渗流压降对应的力源项，建立PM-IBM（Porous Medium-Immersed Boundary Method）模型，实现了结构化网格下的防风网数值边界，并应用于堆场扬尘庇护区湍流风场模拟。结果表明，防风网网高大于1.4倍堆场高时，堆顶扬尘风速随网高呈非线性增长；PM-IBM模型结合通用计算流体力学求解器FLUENT，能够快速、高精度地模拟防风网的阻风作用，为堆场扬尘抑制效率评估提供数据支持。

A windbreak is an important facility for dust suppressing in storage yards of coals or minerals.It can form wind speed sheltering effect using porous panels and reduce the atmosphere pollution from dust entrainment.Numerical wind tunnel testing based on computational fluid dynamics is an advanced technique for predicting the wind sheltering and dust suppressing efficiencies.However,the model for windbreak panels and their wind resistance effect remains a challenge for wind flow turbulence simulations.In this paper,we combined the Immersed Boundary Method and the Porous Medium model by introducing a force source term into the Navier-Stokes Equations to represent the seepage pressure drop of a windbreak.A PM-IBM(Porous Medium-Immersed Boundary Method) model was established and a numerical boundary for windbreak was implemented in the background of structured grid.This model was applied to simulate turbulent flow in dust suppressing areas of storage yards.Simulation results show that when the windbreak height exceeds 1.4 times of pile height,the dust entraining wind speed grows nonlinearly with windbreak height.The PM-IBM model in combination with the general-purpose CFD solver FLUENT can quickly and accurately simulate the wind sheltering effect of the windbreak and provide support for evaluation of dust-suppressing efficiency.