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

0217744，菲利普·刘，康奈尔大学，“利用NEES海啸设施对海啸-结构相互作用的合作研究”这个项目研究海啸产生的力量和破坏性影响。在一些沿海地区，海啸抬高时会出现具有破坏性能量的孔状波锋--陡峭的波锋对海岸建筑物施加很大的冲击力。在其他地方，最大的破坏发生在破损阶段，在这一阶段，大量的水已经将已经削弱的建筑物冲向海洋。当海啸在海岸上下移动时，它们可以运送大量的碎片，如汽车、船只、巨石和电线杆。这些物体可能会撞击和破坏海啸路径沿线的建筑物。因此，需要一种方法来估计海啸移动物体对结构产生的冲击力。(1)了解海啸、刚性和柔性结构以及移动物体之间的动态相互作用；(2)在复杂的助推流动与柔性结构和移动物体相互作用的背景下，提高其建模能力；以及(3)。开发具有高质量实验数据的基准问题，以验证数值模拟模型。这些目标是通过一个综合的实验和理论(数值)研究计划实现的。分析基于雷诺平均的纳维-斯托克斯(RANS)方程和湍流闭合模型，产生了描述海啸、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亥俄州立大学的实验，包括亲自和远程使用NEESgrid的设施。这项研究在传统科学和工程领域--流体力学、结构力学、土力学和应用数学--的交界处进行，因此成为这些领域之间的桥梁。正在开发的数值模拟模型可作为研究或设计工具。例如，工程师可以用它来进行近海和海岸结构的初步设计，并研究海岸结构对环境的影响。它还可以被用作研究工具，以研究船舶撞击、潜艇水动力和水雷探测方法。

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.