基于双向流固耦合的高水头倒虹吸管应力特性分析

Analysis of the stress characteristics high level water inverted siphon based on the fluid-structure interaction

为了解倒虹吸管道运行时的应力及变形情况,在WORKBENCH平台上,采用ANSYS和FLUENT软件对倒虹吸管道内部流场和管道结构响应进行双向流固耦合求解。流场计算基于novel-steokes方程,采用标准k-ε双方程湍流模型;结构计算采用弹性体结构动力学方程。结果表明:在双向流固耦合作用下,输水管道的最大位移发生在管道中间部位,镇墩支撑位置位移最小,管道长度小的管段变形较小;倒虹吸管道弯段与镇墩接触的顶、底部位置存在应力集中,t=5 s时水平管段顶部的沿程应力值呈M型分布。对倒虹吸管道应用双向流固耦合方法分析所得出的结果具有合理性,能够反应出一定的实际问题,同时分析结果亦达到相应精度,满足要求。

In order to understand the inverted siphon pipe stress and deformation,a two-way fluidstructure interaction method was adopted to analyze the internal flow field and structure response of inverted siphon by ANSYS and FLUENT software on the workbench platform. Solution of fluid was obtained based on novel-steokes equation and the standard k-ε turbulence model. Solution of structure was based on elastomer structure dynamic equation. The results showed that under the two-way fluid-structure interaction,the maximum displacement of the pipeline occurred in the middle of the pipe. A minimum displacement occurred on the pipe supporting tanchor concrete block. The shorter the pipeline,the smaller the deformation is; Stress concentration occurred on the top or bottom of siphon at which the tanchor concrete block contact with. When time is 5 seconds,the stress distribution is M type along the top of horizontal pipe.