基于CEL方法的带结构物溃坝流数值模拟

Numerical simulation of dam-break flow with obstacle based on CEL

随着全球气温的不断升高,极端天气现象增多,溃坝现象成为水工结构方向需要重点防范的自然灾害。溃坝流的发展会对下游结构物产生巨大的破坏作用,因此深入探究溃坝流现象的水动力学特性以及溃坝流下游结构物所受到的冲击力影响势在必行。本文针对带有结构物的溃坝流动问题现象,采用CEL方法(Coupled Eulerian-Lagrangian analysis,耦合欧拉-拉格朗日方法),对于溃坝流的发展、演化进行了数值模拟。研究结果表明,模拟结果中溃坝流自由表面及流体尖端时程变化与文献试验结果拟合较好,CEL方法可应用在溃坝流现象的模拟,并且具有较好的准确性和精度。结构物材料性能、高度及与结构物与溃坝流间的位置,均会影响溃坝流的运动状态以及结构物的受力变形状态,在不考虑结构物破坏的情况下,提高结构物弹性模量,增加结构物高度,以及减小结构物与溃坝流间的距离均可提高结构物对于溃坝流的阻挡作用。

The frequent extreme weather events caused by the global warming presents a great challenge to the ecological environment and human survival.Especially,the dam-break problem has been a research focus in hydrodynamic field recently.The dam-break flow can result in a serious destruction of downstream structures.It is imperative to explore the hydrodynamic characteristics of dam-break and the interaction between the dam-break flow and downstream structures.This paper uses the CEL method(Coupled Eulerian-Lagrangian analysis)to numerically simulate the flow process and interaction of dam-break flow with structures.The results show that the CEL method has good usability and accuracy at the simulation of dam-breaking problem.The material properties,height,and location of the structure all affect the flow process of the dam-break flow and the stress strain condition of the structure.Without considering the damage of the structure,by increasing the elastic modulus and height of the structure,or by reducing the distance between the structure and the dam-break flow,the function of blocking the flow of dam-breaking can be improved.