基于拉格朗日體系的典型橋梁斷面風(fēng)-雨耦合作用數(shù)值模擬
發(fā)布時間：2018-08-27 06:03
【摘要】：對典型橋梁斷面風(fēng)-雨耦合作用下的靜三分力進(jìn)行了CFD(Computational Fluid Dynamics)數(shù)值模擬研究.對計算流體動力學(xué)軟件進(jìn)行二次開發(fā),采用DPM(Discrete Phase Model)模型結(jié)合UDF(User Defined Function)函數(shù)施加源項的方法來研究風(fēng)-雨耦合作用對橋梁斷面靜三分力系數(shù)的影響.將空氣作為連續(xù)相通過歐拉法求解,采用基于拉格朗日體系的離散相模型對雨滴運動軌跡進(jìn)行求解,引入離散隨機游走模型來考慮旋渦對雨滴運動的影響,并通過沖量定理得到風(fēng)-雨耦合下的雨滴對主梁斷面的沖擊載荷.通過與文獻(xiàn)結(jié)果比較來驗證方法的正確性,然后研究了風(fēng)-雨耦合作用對典型橋梁斷面三分力系數(shù)的影響,以及三維風(fēng)-雨耦合作用對典型橋梁斷面的作用機理,為研究橋梁風(fēng)-雨耦合荷載提供了基礎(chǔ)理論方法.
[Abstract]:The static three-point force of typical bridge section under the coupling of wind and rain is numerically simulated by CFD (Computational Fluid Dynamics). Based on the secondary development of computational fluid dynamics (CFD) software, the influence of wind-rain coupling on the static three-point force coefficient of bridge section is studied by using DPM (Discrete Phase Model) model and UDF (User Defined Function) function to apply source term. The air as a continuous phase is solved by Euler method. The discrete phase model based on Lagrange system is used to solve the track of raindrop motion. The discrete random walk model is introduced to consider the effect of vortex on the motion of raindrop. The impact load of raindrops on the cross section of the main beam is obtained by the impulse theorem under the coupling of wind and rain. The validity of the method is verified by comparing with the results of literature. Then the influence of the wind rain coupling on the three-point force coefficient of typical bridge section and the action mechanism of three dimensional wind rain coupling action on typical bridge section are studied. It provides a basic theoretical method for the study of wind-rain coupling loads of bridges.
【作者單位】： 長沙理工大學(xué)橋梁工程安全控制省部共建教育部重點實驗室;路易斯安娜州立大學(xué)土木與環(huán)境工程系;
【基金】：國家自然科學(xué)基金資助項目(51408061) 國家重點基礎(chǔ)研究計劃(973計劃)項目(2015CB057706)~~
【分類號】：U441.3
[Abstract]:The static three-point force of typical bridge section under the coupling of wind and rain is numerically simulated by CFD (Computational Fluid Dynamics). Based on the secondary development of computational fluid dynamics (CFD) software, the influence of wind-rain coupling on the static three-point force coefficient of bridge section is studied by using DPM (Discrete Phase Model) model and UDF (User Defined Function) function to apply source term. The air as a continuous phase is solved by Euler method. The discrete phase model based on Lagrange system is used to solve the track of raindrop motion. The discrete random walk model is introduced to consider the effect of vortex on the motion of raindrop. The impact load of raindrops on the cross section of the main beam is obtained by the impulse theorem under the coupling of wind and rain. The validity of the method is verified by comparing with the results of literature. Then the influence of the wind rain coupling on the three-point force coefficient of typical bridge section and the action mechanism of three dimensional wind rain coupling action on typical bridge section are studied. It provides a basic theoretical method for the study of wind-rain coupling loads of bridges.
【作者單位】： 長沙理工大學(xué)橋梁工程安全控制省部共建教育部重點實驗室;路易斯安娜州立大學(xué)土木與環(huán)境工程系;
【基金】：國家自然科學(xué)基金資助項目(51408061) 國家重點基礎(chǔ)研究計劃(973計劃)項目(2015CB057706)~~
【分類號】：U441.3
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