立方体模型周边风致积雪飘移的数值模拟

Numerical Simulation on Snow Drifting Around a Cube Model

摘要:

基于两相流理论模拟立方体周围的积雪飘移.采用各向异性的雷诺应力模型(RSM)，通过改进动量方程和湍流方程的源项来考虑雪的浮力和惯性力对风(空气相)的影响.以立方体模型为研究对象，首先将改进模型计算的表面风压分布与实测结果进行了对比，接着把改进模型的雪飘移计算结果与未改进模型的计算结果、实测结果进行了对比.结果显示，改进后模型的模拟结果与实测结果更加吻合，立方体模型周边雪颗粒的沉积侵蚀趋势表现一致.在立方体迎风侧的前方区域及两侧气流分离区出现了明显的侵蚀，紧靠背风侧后方区域出现了沉积.

Abstract:

Based on the two-phase flow theory,an improved Reynolds stress model(RSM) turbulent model is presented as to stimulate the snow drifting around a cube model.In order to represent the influence of snow particles on the wind field,extra source items are added both to the momentum equations and RSM turbulent model.Comparison of the mean wind pressure on the surface of the cube between obtained results and those through field measurements are presented as to evaluate the suitability and effectiveness.Then snow drifting results predicted by the improved model are compared with the results from the previous researches.It is found that the present results agree well with those through the field measurements,such as the trends of erosion/deposit of snow particles around cube are similar.The simulated results show erosion appears in the windward region,as well as in the separation region at both sides.While deposition appears in the leeward region.