闸门运动对溃坝波越堤过程的影响研究

Study on the influence of gate motion on the process of dam-break wave over the submerged dike

通过物理模型实验和数值模拟相结合的方式,精细化模拟了溃坝波翻越潜堤的过程.基于纳维-斯托克斯方程的双液相黏性流模型开展数值模拟,分析实验过程中闸门运动对溃坝波越堤过程的影响,重点分析溃坝的流速、水位、传播速度、上下游交界面形态,并通过与最新的实验结果的比较验证了模型的有效性.结果表明:有闸门的数值模拟结果要比无闸门的更接近实验结果,且闸门运动速度越大,溃坝波传播越快,上下游交界面形态也越规则;下游水位峰值、上游流速、下游堤前及堤顶流速峰值随着闸门速度的增加而变大,而堤后流速则随着闸门速度的增大而减小.

Through the combination of experiment and numerical simulation,the meticulous simulation study of dam-break wave over the submerged dike was carried out.A two-phase viscous flow model based on Navier-Stokes equation was used to carry out numerical simulation to analyze the influence of gate motion on the process of dam-break wave over a submerged dike.Considerable attention was paid to the flow velocity,water level,propagation velocity and the upstream-downstream interface.And the validity of the numerical model was verified by comparison with newly performed experimental results. The results show that the numerical simulation results with gate are closer to the experimental results than those without gate;and the higher the gate velocity,the faster the dam-break wave propagation,the more regular the upstream-downstream interface;besides,the downstream water level peak,upstream flow velocity,downstream flow velocity before the dike and on the dike all increase as the gate velocity increases,while the flow velocity after the dike decreases as the gate velocity increases.