發(fā)布時(shí)間：2018-07-05 01:57

  本文選題：四步CBS穩(wěn)定化有限元 + 任意拉格朗日-歐拉(ALE)　； 參考：《上海交通大學(xué)》2014年博士論文

【摘要】：自然界中流體流動(dòng)多以剪切來流的形式存在,而非均勻來流的形式出現(xiàn)。剪切來流作用下的鈍體結(jié)構(gòu)(群)繞流與流致振動(dòng)問題在自然界中廣泛存在,如高層建筑結(jié)構(gòu)、拉索結(jié)構(gòu)、橋梁結(jié)構(gòu)、海洋結(jié)構(gòu)物等鈍體結(jié)構(gòu)。本文以土木工程和海洋工程的相關(guān)問題為背景,發(fā)展新型穩(wěn)定化有限元計(jì)算方法,研究剪切來流作用下鈍體結(jié)構(gòu)(群)繞流和流致振動(dòng)的科學(xué)基礎(chǔ)問題,分析剪切來流作用下鈍體結(jié)構(gòu)(群)互擾效應(yīng)和尾流特性,單鈍體結(jié)構(gòu)的流致振動(dòng)和多鈍體結(jié)構(gòu)的流固耦合互擾效應(yīng),主要研究工作和創(chuàng)新點(diǎn)如下:1.提出了四步半隱式特征線分裂算子(Four-step Semi-implicit CharacteristicBased Split;4-SICBS)穩(wěn)定化有限元新型格式,為鈍體繞流研究提供了新的計(jì)算手段。該方法可求解層流范圍內(nèi)的不可壓縮黏性流體問題,同傳統(tǒng)顯式特征線分裂算子(CBS)有限元格式相比,允許更大的計(jì)算時(shí)間步和獲得更好的計(jì)算穩(wěn)定性。2.發(fā)展了求解渦激振動(dòng)問題的流體穩(wěn)定化有限元新型格式:4-SICBS-ALE,為求解鈍體結(jié)構(gòu)(群)渦激振動(dòng)問題提供有效的計(jì)算手段。將上述4-SICBS穩(wěn)定化有限元格式推廣到任意拉格朗日-歐拉(ALE)描述下,并結(jié)合一種引入光滑技術(shù)的動(dòng)網(wǎng)格方法,發(fā)展了適用于剪切來流作用下鈍體結(jié)構(gòu)(群)流致振動(dòng)問題的高效分區(qū)耦合算法。該算法可有效解決剛體大位移運(yùn)動(dòng)而導(dǎo)致網(wǎng)格失效的問題,為研究剪切來流作用下鈍體結(jié)構(gòu)(群)渦激振動(dòng)問題提供了更高效更穩(wěn)定的計(jì)算方法。3.以輸電線、拉索結(jié)構(gòu)與海洋管道結(jié)構(gòu)物等為應(yīng)用背景,研究了剪切來流作用下靜止順排雙圓柱系統(tǒng)的鈍體結(jié)構(gòu)群繞流問題,揭示了來流剪切率、雙圓柱間距比和雷諾數(shù)對(duì)靜止結(jié)構(gòu)群繞流特性與氣動(dòng)參數(shù)的影響,揭示鈍體結(jié)構(gòu)物周圍的流動(dòng)互擾機(jī)理。研究發(fā)現(xiàn):在剪切來流作用下,雙圓柱體結(jié)構(gòu)之間的互擾效應(yīng)十分復(fù)雜,其氣動(dòng)特性與尾流模態(tài)較均勻來流工況產(chǎn)生顯著變化。4.以多邊形高層建筑結(jié)構(gòu)物、戶外廣告支撐結(jié)構(gòu)體系與海洋結(jié)構(gòu)物等為應(yīng)用背景,研究了均勻來流時(shí)強(qiáng)迫轉(zhuǎn)動(dòng)下三角柱鈍體結(jié)構(gòu)的繞流問題。深入分析了三角柱鈍體結(jié)構(gòu)在不同來流攻角與雷諾數(shù)時(shí),轉(zhuǎn)動(dòng)幅度與轉(zhuǎn)動(dòng)頻率對(duì)繞流的影響,揭示了該系統(tǒng)下鎖定區(qū)間范圍、氣動(dòng)參數(shù)與尾流特性,闡明了強(qiáng)迫轉(zhuǎn)動(dòng)條件下三角柱鈍體結(jié)構(gòu)繞流機(jī)理。研究發(fā)現(xiàn):在不同的來流攻角下,該系統(tǒng)的雷諾數(shù)效應(yīng)顯著。5.以拉索結(jié)構(gòu)、海洋立管、海底輸油管道等為應(yīng)用背景,研究了剪切來流作用下單圓柱體鈍體結(jié)構(gòu)的單/雙自由度流致振動(dòng)問題。采用本文所發(fā)展的4-SICBS-ALE算法,研究了在Re=150時(shí),關(guān)鍵參數(shù)(來流剪切率、折減速度與頻率比)對(duì)單圓柱體鈍體結(jié)構(gòu)的振動(dòng)響應(yīng)特征與尾流泄渦模式的影響,揭示了該系統(tǒng)的動(dòng)力響應(yīng)、運(yùn)動(dòng)軌跡、尾流泄渦模式和氣動(dòng)力參數(shù)特性,闡明了流體-固體耦合作用的渦動(dòng)力機(jī)理。6.以拉索群、輸電線群與海洋立管群等為應(yīng)用背景,研究了剪切來流作用下順排布置雙圓柱體結(jié)構(gòu)的雙自由度渦激振動(dòng)問題。研究了在Re=160時(shí),關(guān)鍵參數(shù)(來流剪切率、間距比與折減速度)對(duì)雙圓柱體結(jié)構(gòu)體系的振動(dòng)響應(yīng)特性與尾流模態(tài)的影響,揭示了該系統(tǒng)的動(dòng)力響應(yīng)、軌跡特征和尾流特性,闡明了多鈍體流固耦合互擾機(jī)理。本文發(fā)展的新型穩(wěn)定化有限元算法,可準(zhǔn)確高效穩(wěn)定地求解剪切來流作用下鈍體結(jié)構(gòu)(群)繞流和渦激振動(dòng)問題;針對(duì)工程應(yīng)用背景,提煉出的關(guān)鍵性問題所獲得的研究成果,可為土木工程和海洋工程領(lǐng)域工程設(shè)計(jì)計(jì)算提供理論依據(jù)和設(shè)計(jì)參考,具有重要的應(yīng)用價(jià)值,對(duì)認(rèn)識(shí)該問題的力學(xué)機(jī)理具有重要的學(xué)術(shù)意義。
[Abstract]:Fluid flow in nature exists mostly in the form of shear flow and non uniform flow. The problem of blunt body structure (Group) around flow and flow induced vibration under shear flow is widely existed in nature, such as high-rise building structure, cable structure, bridge structure, ocean structure and other blunt body structures. This paper is based on civil engineering and ocean. A new stable finite element method is developed to study the scientific basic problems of the flow induced and flow induced vibration of the blunt body structure (Group) under shear flow. The interaction and wake characteristics of the blunt body structure (Group), the flow induced vibration of the single blunt body structure and the fluid solid coupling of the multi blunt body structure are analyzed. The main research work and innovation are as follows: 1. a new four step semi implicit characteristic line splitting operator (Four-step Semi-implicit CharacteristicBased Split; 4-SICBS) is proposed to stabilize the flow around the blunt body. This method can solve the incompressible viscous fluid problem in the laminar flow. Compared with the traditional explicit characteristic line splitting operator (CBS) finite element scheme, the new finite element method for solving the problem of vortex excited vibration is developed by allowing a larger calculation time step and obtaining a better computational stability.2.. 4-SICBS-ALE, which provides an effective calculation method for solving the problem of vortex induced vibration of the blunt body structure (Group). The ICBS stabilization finite element method is extended to the arbitrary Lagrange Euler (ALE) description, and a high efficient zoning coupling algorithm is developed to solve the vibration problem of the blunt body structure (Group) flow under the action of the shear flow, which can effectively solve the grid failure caused by the large displacement of the rigid body. In order to study the problem of vortex induced vibration of a bluff body structure (Group) under shear flow, a more efficient and stable method for calculating the vortex induced vibration of the blunt body structure (Group),.3. is used to study the flow around the blunt body structure group in the static row double cylindrical system under the action of shear flow. The influence of the ratio of the spacing of two cylinders and the Reynolds number on the flow behavior and aerodynamic parameters of the static structure group is revealed, and the interaction mechanism of flow around the structure of the blunt body is revealed. It is found that the interaction effect of the double cylinder structure is very complex under the action of the shear flow, and the aerodynamic characteristics and the wake mode have a significant change of.4 in the uniform flow condition. The flow around a triangular column blunt body structure under the forced rotation of a uniform flow is studied with a polygon tall building structure, an outdoor advertising support structure and a marine structure. The influence of the rotational amplitude and the rotational frequency on the flow around the triangle column blunt body structure at different attack angles and Reynolds numbers is deeply analyzed. The locking interval range, aerodynamic parameters and wake characteristics under the system are revealed, and the mechanism of flow around the blunt body of a triangular column under forced rotation is clarified. It is found that the Reynolds number effect of the system is significantly.5. under the different current angle of attack, with the application background of the cable structure, the marine riser and the bottom oil pipeline, and the shear flow is studied. Using the 4-SICBS-ALE algorithm developed in this paper, the effects of the key parameters (the shear rate of the flow, the reduction rate and the frequency ratio) on the vibration response characteristics of the single cylinder blunt body structure and the wake vortex mode are investigated by using the developed 4-SICBS-ALE algorithm, and the dynamic response of the system is revealed. The motion trajectory, the tail flow vortex mode and the aerodynamic parameter characteristics illustrate the vortex dynamic mechanism of the fluid solid coupling action.6., which is applied to the cable group, the transmission line group and the marine riser group, and studies the double degree of freedom vortex excited vibration of the double cylinder arrangement under the action of the shear flow. The key parameters are studied at the time of Re=160. The dynamic response, trajectory characteristics and wake characteristics of the system are revealed by the influence of the number of flow shear rate, spacing ratio and reduction velocity on the vibration response characteristics and wake modes of the system. The new stabilization finite element method developed in this paper can be accurately and efficiently solved. The research results obtained from the key problems of the engineering application background can provide theoretical basis and design reference for the engineering design and calculation in the field of civil engineering and marine engineering. The research results obtained from the key problems of the engineering application background can be provided for the engineering design and calculation in the field of Civil Engineering and marine engineering. It has important application value and the mechanical mechanism to understand the problem. There is an important academic significance.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU311.3

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