港航院:CFD of breaking waves and coastal sediment transport using stabilized turbulence closure models

发布者:综合科发布时间:2020-07-18浏览次数:10

报告题目:CFD of breaking waves and coastal sediment transport using stabilized turbulence closure models 

报告人:David R. Fuhrman 教授,丹麦科技大学,《ASCE J. Waterway Port, Coastal and Ocean Engineering》副主编 

报告时间: 2020723日下午15:30-16:30 

报告地点: 腾讯会议,房间号:682 818 205 

入会方式:姓名+工作单位 

报告人简介:David R. Fuhrman, 现任丹麦科技大学海岸及海洋工程系教授(A/Prof.),主要研究方向为波浪势流理论、湍流、泥沙输运和海床冲刷等问题。发表各类论文100余篇,担任《Coastal Engineering,ASCE J. Waterway Port, Coastal and Ocean Engineering,Applied Ocean Research》等多个杂志的副主编或编委。

 

内容提要:Recent research from the Technical University of Denmark (DTU) on the CFD of breaking waves will be presented. Analysis of standard two-equation turbulence closure models will be presented, formally proving that they are unconditionally unstable in the potential flow regions beneath surface waves. This explains the marked wide-spread over-prediction of turbulence levels experienced in most previous CFD simulations of wave breaking. A simple and elegant method for their formal stabilization will be presented, requiring minimal changes to existing codes (say 3-4 lines of code), thus solving this problem. Model applications demonstrating improved performance of new stabilized turbulence models will include: (1) simple wave trains, (2) small scale spilling and plunging regular waves, (3) full scale plunging of bichromatic wave groups (both flow and sediment transport and morphology), and (4) breaking of dispersive short waves on long tsunami fronts. In the latter case, the importance (or lack thereof) of such short waves in the overall run-up of tsunamis will be discussed.