丘陵沟壑区域大场域空间流场模型边界效应和建模方法:以山西运城工作区为例

Boundary Effects and Modeling Method of Large Field Space Flow Field Model in Hilly and Gully Region:A Case Study of a Specific Region in Yuncheng,Shanxi

基于计算流体力学相关理论,实现丘陵沟壑区域大场域空间内塔线高度层气流场的精准模拟是研究风载荷下高压输电线路风振响应及力学特性,实现塔-线偶联结构体优化设计的关键。但由于缺乏针对边界效应的系统研究,致使流场仿真结果不精准或模型边界过度冗余而难以求解。为了解决这个难题,基于数字高程模型(digital elevation model,DEM)数据对某典型地域建模,通过流场仿真和边界效应分析,系统讨论了复杂地形下特定高度层流场仿真中建模方法和边界效应的影响。结果表明:计算域高度达到地形高差7倍以上时其边界效应影响基本消失;壁面边界约束导致的流场畸变随冗余距离增加而减小,选择700 m的冗余距离可获得更稳定的风场。相关结论明确了计算域对于流场的影响以及流体模型边界效应的消除方法,对高压输电线路结构稳定性和抗风能力提升具有参考价值。

Accurately simulating the airflow field at tower-line height of large field space in hilly and gully areas is key to studying the wind-induced vibration response and mechanical characteristics of high-voltage transmission lines and optimizing the tower-line coupling structure design,based on the relevant theory of computational fluid dynamics.However,due to the lack of systematic research on boundary effects,the simulation results of the flow field are not accurate or the model boundaries are excessively redundant and difficult to solve.In order to address this challenge,a typical region was modeled based on DEM data,and the influence of modeling methods and boundary effects on flow field simulation at specific height layers in complex terrain was systematically discussed through flow field simulation and boundary effect analysis.The results indicate that when the height of the calculation domain exceeds seven times the terrain height difference,the boundary effect is essentially eliminated.Furthermore,the distortion of the flow field caused by wall boundary constraints decreases as the redundant distance increases,with a redundant distance of 700 m being able to obtain a more stable wind field.It is concluded that the study effectively elucidates the impact of the calculation domain on the flow field and presents a method to mitigate the boundary effect of the fluid model.These findings hold valuable reference value for enhancing the stability and wind resistance of high-voltage transmission line structures.