To predict the wave loads of a flexible trimaran in different wave fields,a one-way interaction numerical simulation method is proposed by integrating the fluid solver(Star-CCM+)and structural solver(Abaqus).Differing...To predict the wave loads of a flexible trimaran in different wave fields,a one-way interaction numerical simulation method is proposed by integrating the fluid solver(Star-CCM+)and structural solver(Abaqus).Differing from the existing coupled CFD-FEA method for monohull ships in head waves,the presented method equates the mass and stiffness of the whole ship to the hull shell so that any transverse and longitudinal section stress of the hull in oblique waves can be obtained.Firstly,verification study and sensitivity analysis are carried out by comparing the trimaran motions using different mesh sizes and time step schemes.Discussion on the wave elevation of uni-and bi-directional waves is also carried out.Then a comprehensive analysis on the structural responses of the trimaran in different uni-directional regular wave and bi-directional cross sea conditions is carried out,respectively.Finally,the differences in structural response characteristics of trimaran in different wave fields are studied.The results show that the present method can reduce the computational burden of the two-way fluid-structure interaction simulations.展开更多
本文应用基于松弛的全局ML指数(slacks based measure of global Malmquist-Luenberger index,SBM-GML)法来测算我国中部区域2008—2019年期间的绿色生产率(green total factor productivity,GTFP),采用空间引力模型衡量中部地区旅游业...本文应用基于松弛的全局ML指数(slacks based measure of global Malmquist-Luenberger index,SBM-GML)法来测算我国中部区域2008—2019年期间的绿色生产率(green total factor productivity,GTFP),采用空间引力模型衡量中部地区旅游业绿色生产率空间联系强度,并对其驱动因素进行考察研究。研究发现:2008—2019年中部地区旅游业绿色生产率波动幅度较大,整体呈现出上升的趋势;各省的旅游业绿色生产率差异不大,山西省的旅游业绿色生产率位于中部六省之首;中部六省的旅游业绿色生产率间空间联结格局变化较为稳定,相邻省市间旅游业绿色生产率空间联系强度较高;区位熵、交通便利程度、GDP(国内生产总值)、对中部地区旅游业绿色生产率产生正向的影响。展开更多
基金financially supported by the State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology(Grant No.GZ23112)the Shandong Provincial Natural Science Foundation,China(Grant No.ZR2021ME146).
文摘To predict the wave loads of a flexible trimaran in different wave fields,a one-way interaction numerical simulation method is proposed by integrating the fluid solver(Star-CCM+)and structural solver(Abaqus).Differing from the existing coupled CFD-FEA method for monohull ships in head waves,the presented method equates the mass and stiffness of the whole ship to the hull shell so that any transverse and longitudinal section stress of the hull in oblique waves can be obtained.Firstly,verification study and sensitivity analysis are carried out by comparing the trimaran motions using different mesh sizes and time step schemes.Discussion on the wave elevation of uni-and bi-directional waves is also carried out.Then a comprehensive analysis on the structural responses of the trimaran in different uni-directional regular wave and bi-directional cross sea conditions is carried out,respectively.Finally,the differences in structural response characteristics of trimaran in different wave fields are studied.The results show that the present method can reduce the computational burden of the two-way fluid-structure interaction simulations.
文摘本文应用基于松弛的全局ML指数(slacks based measure of global Malmquist-Luenberger index,SBM-GML)法来测算我国中部区域2008—2019年期间的绿色生产率(green total factor productivity,GTFP),采用空间引力模型衡量中部地区旅游业绿色生产率空间联系强度,并对其驱动因素进行考察研究。研究发现:2008—2019年中部地区旅游业绿色生产率波动幅度较大,整体呈现出上升的趋势;各省的旅游业绿色生产率差异不大,山西省的旅游业绿色生产率位于中部六省之首;中部六省的旅游业绿色生产率间空间联结格局变化较为稳定,相邻省市间旅游业绿色生产率空间联系强度较高;区位熵、交通便利程度、GDP(国内生产总值)、对中部地区旅游业绿色生产率产生正向的影响。