坝体与库水的流固耦合分析

Fluid-Solid Coupling Analysis of Dam-Reservoir Interaction

基于流固耦合分析方法,分别应用势流模式和位移模式2种流体单元模拟库水,并与传统的附加质量方法模拟库水的方法做了比较,结果显示该方法可行;相比附加质量方法,流固耦合方法与理论解更为接近,其中位移模式流体单元对单元形态要求较高。对库水截取区域的敏感性分析表明,流体区域选取3~5倍坝高可以得到较为满意的结果。以重力坝的不同坝顶宽度为例,讨论了需要考虑库水可压缩性的条件,这些成果为后续工作奠定了基础。

Dam-reservoir interaction was analyzed in this paper using fluid-solid coupling method.The reservoir water was modeled respectively by two types of finite element,namely pressure-based element and displacement-based element.The fluid-solid coupling method was compared with traditional Westergaard additional mass method and the comparison showed that the former was closer to the theoretical solution than the latter.The displacement-based element demanded more regular element shape than pressure-based element.Moreover,sensitivity analysis of selected areas of the reservoir showed that satisfactory results can be obtained if the length of reservoir area to be modeled was designed only 3-5 times the height of the dam.Finally,the compressibility of water was also explored taking the gravity dam structured model with different dam crest widths as an example.The present results will be helpful for the following research.