本文選題：顫振　切入點：流固耦合　出處：《四川大學學報(工程科學版)》2014年05期 　論文類型：期刊論文

【摘要】：為有效分析風-橋梁的相互作用和研究橋梁的顫振穩(wěn)定性問題,發(fā)展了一種顯式求解流固耦合問題的LBM數值模擬方法。將傳統大渦模擬的亞格子渦黏性模型——動態(tài)Smagorinsky模型(dynamic Smagorinsky model,DSM)引入多松弛時間格式的格子玻爾茲曼方法(multiple relaxation time-lattice Boltzmann method,MRT-LBM)中,構造了一種顯式運算的大渦模擬方法——MRT-LBM-DSM。采用MRT-LBM-DSM作為流場求解器;將結構視為彈性支撐于流場中的剛體,其運動方程采用Runge-Kutta法求解;利用格子玻爾茲曼方法(lattice Boltzmann method,LBM)的移動邊界技術更新流固耦合面的位置,實現了流固耦合問題的松耦合分區(qū)顯式求解。基于提出的LBM流固耦合算法,編制計算程序對Great Belt東橋的顫振穩(wěn)定性進行分析。研究表明,由LBM流固耦合算法計算得到的Great Belt東橋顫振臨界風速與試驗和其他數值結論吻合良好,初步說明LBM流固耦合算法可以較為準確地預測顫振現象的發(fā)生。
[Abstract]:In order to effectively analyze the wind-bridge interaction and study the flutter stability of the bridge, In this paper, an explicit LBM numerical simulation method for fluid-solid coupling problems is developed. The sublattice vorticity viscosity model-dynamic Smagorinsky model is introduced into multiple relaxation time-lattice Boltzmann method MRT-LBMs with multiple relaxation time schemes. A large eddy simulation method for explicit computation, MRT-LBM-DSM, is constructed. MRT-LBM-DSM is used as the flow field solver, the structure is regarded as a rigid body supported by elasticity in the flow field, and the equation of motion is solved by Runge-Kutta method. The lattice Boltzmann method is used to update the position of fluid-solid coupling surface by using the moving boundary technique of lattice Boltzmann method. The loose-coupling partition explicit solution of fluid-structure coupling problem is realized. Based on the proposed LBM fluid-structure coupling algorithm, The flutter stability of Great Belt East Bridge is analyzed by computer program. The results show that the critical flutter velocity of Great Belt East Bridge calculated by LBM fluid-solid coupling algorithm is in good agreement with the experimental and other numerical results. It is shown that LBM fluid-solid coupling algorithm can accurately predict flutter phenomenon.
【作者單位】： 哈爾濱工業(yè)大學土木工程學院;Faculty
【基金】：國家國際科技合作資助項目(2011DFA21460) 國家高技術研究發(fā)展計劃(“863計劃”)資助項目(2008AA11Z104)
【分類號】：U441.3

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