Collaborative Research on Landslide Generated Tsunamis and Tsunami-Structure Interactions Using NEES Tsunami Basin Facilities

0217744, Philip Liu，康奈尔大学，“利用NEES海啸设施进行海啸-结构相互作用的合作研究”。该项目研究海啸产生的力量以及海啸的破坏性影响。在一些沿海地区，海啸的上升伴随着具有破坏性能量的钻孔状波阵——陡峭的波阵对海岸结构产生很大的冲击力。在其他地区，最严重的破坏发生在破坏阶段，此时大量的水将已经受损的建筑物冲刷回海洋。当海啸在海岸上下移动时，它们可以携带大量的碎片，如汽车、船只、巨石和杆子。这些物体会对海啸路径沿线的建筑物造成冲击和破坏。因此，需要一种方法来估计由海啸传播的移动物体的冲击对结构产生的力。本研究计划的目标是。(1)了解海啸、刚性和柔性结构以及运动物体之间的动态相互作用；(2)提高复杂爬坡流与柔性结构和运动物体相互作用的建模能力；和(3)。开发具有高质量实验数据的基准问题，用于验证数值模拟模型。这些目标是通过综合实验和理论（数值）研究计划实现的。该分析基于Reynolds平均Navier-Stokes （RANS）方程和湍流闭合模型，生成了描述海啸、移动物体和柔性结构之间相互作用的模拟模型。为了验证模拟模型，在俄勒冈州立大学新的地震工程模拟网络（NEES）海啸设施中进行了一系列实验。康奈尔大学的研究小组也参与了俄勒冈州立大学的实验，包括亲自或远程使用NEESgrid的设施。本研究在传统的科学和工程领域——流体力学、结构力学、土壤力学和应用数学——的界面上进行，从而成为这些领域之间的桥梁。所建立的数值模拟模型可以作为研究或设计的工具。例如，工程师可以用它来进行离岸和海岸结构的初步设计，并研究海岸结构对环境的影响。它也可以被用作研究工具来调查船舶撞击、潜艇流体动力学和水雷探测方法。

0217744, Philip Liu, Cornell University"Collaborative Research on Tsunami-Structure Interaction Using the NEES Tsunami Facility"This project addresses the forces generated by, and the destructive effects of, tsunamis. At some coastal locations, the tsunami runup occurs with a bore-like wave front with destructive energy - the steep wave front exerts high impact forces on coastal structures. In other locations, the greatest damage occurs during the rundown phase, where masses of water sweep already weakened structures back toward the ocean. As tsunamis move up and down a coast, they can transport large quantities of debris, such as cars, boats, boulders, and poles. These objects can impact and damage structures along the paths of the tsunami. Therefore, a means of estimating the forces on a structure resulting from the impact from a tsunami-borne moving object is needed.The objectives of this research program are. (1) To understand the dynamic interactions between a tsunami, rigid and flexible structures, and moving objects; (2) To improve the modeling capability of the complex runup flows within the context of their interactions with flexible structures and moving objects; and (3). To develop benchmark problems with high quality experimental data for validating numerical simulation models. These objectives are achieved via an integrated experimental and theoretical (numerical) research program. The analysis is based on the Reynolds Averaged Navier-Stokes (RANS) equations and the turbulence closure model, yielding simulation models describing the interactions between a tsunami, moving objects and flexible structures. To validate the simulation models, a series of experiments is conducted at the new Network for Earthquake Engineering Simulation (NEES) tsunami facility at Oregon State University. The research team at Cornell University also participates in the experiments at OSU, both in person and remotely using the facilities of the NEESgrid.This research operates at the interface between traditional fields of science and engineering - fluid dynamics, structural mechanics, soil mechanics and applied mathematics - and thereby serves as a bridge among these fields. The numerical simulation model being developed can be used as a research or design tool. For instance, engineers can use it to perform preliminary designs for offshore and coastal structures, and to study the impact of coastal structures on the environment. It can also be employed as a research tool to investigate ship slamming, submarine hydrodynamics, and mine detection methodology.