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题目：Development of numerical methods for linear and nonlinear fluid-structure interaction dynamics with applications

时间：2016年6月2日上午9:30-11:00

地点：船海楼三楼大会议室

主办单位：科学技术研究院

承办单位：船舶工程学院

报告人简介：J.T. Xing (JTX) is a Professor in the Fluid Structure Interaction Group at the University of Southampton. He obtained his doctoral degree in fluid-solid interaction dynamics from Tsinghua University, Beijing China in 1984. Professor Xing has a broad range of research interests and contributions in theoretical and applied continuum dynamics, computational modelling, fluid-solid interactions, nonlinear dynamics, vibrations and controls. He has made significant contributions to the development of the variational principles for linear and nonlinear elastodynamics, the numerical methods for linear / nonlinear fluid-structure dynamics, the power flow theory and passive / active vibration controls etc. His publication record includes over 250 journal/conference papers and technical research reports. One his new book” Energy flow theory on Nonlinear Dynamical System with Application” has just published by Springer. He has successfully managed many research grants, as the principal/joint investigators of EPSRC and European grants. He is a fellow of the Institute of Mathematics and its applications.摘要：This seminar presents a review on some developments of numerical methods for linear and nonlinear fluid-solid interaction (FSI) problems with their applications in engineering. The discussion covers the four types of numerical methods: 1) mixed finite element (FE)-substructure-subdomain model to deal with linear FSI in a finite domain, such as sloshing, acoustic-structure interactions, pressure waves in fluids, earthquake responses of chemical vessels, dam-water couplings, etc.; 2) mixed FE-boundary element (BE) model to solve linear FSI with infinite domains, for example, VLFS subject to airplane landing impacts, ship dynamic response caused by cannon / missile fire impacts, etc.; 3) mixed FE-finite difference (FD) / volume (FV) model for nonlinear FSI problems with no separations between fluids and solids and breaking waves; 4) mixed FE-smooth particle (SP) method to simulate nonlinear FSI problems with f-s separations as well as breaking waves. The partitioned iteration approach is suggested in base of available fluid and solid codes to separately solve their governing equations in a time step, and then through reaching its convergence in coupling iteration to forward until the problem solved. The selected application examples include air-liquid-shell three phases interactions, LNG ship-water sloshing; acoustic analysis of air-building interaction system excited by human foot impacts; transient dynamic response of an airplane-VLFS-water interaction system excited by airplane landing impacts; turbulence flow-body interactions; structure dropping down on the water surface with breaking waves, etc. The numerical results are compared with the available experiment or numerical data to demonstrate the accuracy of the discussed approaches and their values for engineering applications. Based on FSI analysis, linear and nonlinear wave energy harvesting devices are listed to use the resonance in a linear system and the periodical solution in a nonlinear system, such as flutter, to effectively harvest wave energy. There are 231 references are given in the related publication paper by LXJZ, which provides very useful resources for readers to further investigate their interesting approaches