【摘要】：海上油氣開采及輸送中,通常遇到旁靠多浮式結(jié)構(gòu)協(xié)同作業(yè)的問題。在某些海況下,多浮式結(jié)構(gòu)之間會出現(xiàn)嚴重影響海上作業(yè)安全性和穩(wěn)定性的強耦合作用情況。本文基于粘流理論以及計算流體力學(xué)(CFD)理論,自由液面捕捉采用VOF法,基于CFD商業(yè)軟件Flow3D,對兩浮式結(jié)構(gòu)窄縫間的流場問題進行了詳細分析,以研究窄縫水波振蕩現(xiàn)象的規(guī)律。論文的主要工作成果如下:(1)詳細介紹了常見的旁靠多浮體系統(tǒng),并對國內(nèi)外關(guān)于多浮體水動力干擾的研究現(xiàn)狀進行了較為全面的綜述,對各類研究方法和應(yīng)用進行了歸納和總結(jié)。(2)建立了旁靠浮式結(jié)構(gòu)相互耦合作用分析模型,通過二維和三維數(shù)值波浪水槽,對窄縫間的流場進行了數(shù)值計算。計算結(jié)果與有關(guān)文獻中的試驗結(jié)果較為一致,驗證了本文研究方法和數(shù)值計算的準(zhǔn)確性和可靠性。(3)首先對旁靠模型進行網(wǎng)格收斂性分析,選擇最優(yōu)網(wǎng)格劃分方案,計算分析了兩固定結(jié)構(gòu)物窄縫間的流場問題。通過對波面升高和窄縫間流體運動兩方面的分析,發(fā)現(xiàn):當(dāng)窄縫間距相同時,不同波浪周期下窄縫間的流體運動各不相同,當(dāng)入射規(guī)則波達到共振周期時,窄縫間流場會出現(xiàn)顯著的波浪升高現(xiàn)象;隨著窄縫間距的增大,窄縫間流場的共振周期也隨之增大。當(dāng)波長過大時,窄縫對內(nèi)外流場起到遮蔽效應(yīng),窄縫間不會出現(xiàn)明顯的波面升高。當(dāng)波長進一步減小,小于1倍船長時,波浪可以進入窄縫內(nèi)部并出現(xiàn)波面升高,此時窄縫間距越小,窄縫間流體的運動越劇烈。窄縫間可有一個或多個峰值點,其與長寬比L/B和波長比λ/L有關(guān)。(4)數(shù)值分析了波浪/多浮體運動/窄縫振蕩的全耦合問題。通過比較單浮體和多浮體在運動和受力上的差異發(fā)現(xiàn):由于窄縫間流體運動的影響,自由浮式結(jié)構(gòu)的運動和受力發(fā)生較大幅度的變化,說明窄縫間流體運動對結(jié)構(gòu)的影響是不可忽略的。(5)通過改變波浪的入射方向,對斜浪和橫浪作用下,兩浮式結(jié)構(gòu)窄縫間的流場問題進行了數(shù)值模擬,分析橫浪與斜浪作用下流場的波面升高,窄縫內(nèi)部的流體運動。并結(jié)合迎浪計算的結(jié)果,對比分析三種浪向下浮體的運動與受力情況,得出斜浪相較于其他工況更為危險的結(jié)論。
[Abstract]:In offshore oil and gas production and transportation, the problem of multi-floating structures is usually encountered. Under some sea conditions, there is a strong coupling between multi-floating structures which seriously affects the safety and stability of offshore operations. Based on viscous flow theory and (CFD) theory of computational fluid dynamics, VOF method is used to capture free liquid surface, and the flow field between two floating structures is analyzed in detail based on CFD commercial software Flow3D,. In order to study the law of narrow slit water wave oscillation. The main results of this paper are as follows: (1) the paper introduces the common side floating body system in detail, and summarizes the research status of multi-floating body hydrodynamic disturbance at home and abroad. All kinds of research methods and applications are summarized and summarized. (2) the coupling analysis model of side floating structures is established, and the flow field between narrow slits is numerically calculated by two and three dimensional numerical wave flume. The calculated results are consistent with the experimental results in related literatures, which verify the accuracy and reliability of the research method and numerical calculation in this paper. (3) the mesh convergence analysis of the side model is carried out first, and the optimal mesh generation scheme is selected. The flow field between the narrow slits of two fixed structures is calculated and analyzed. Through the analysis of wave surface rise and fluid motion between narrow slits, it is found that the fluid motion between narrow slits is different under different wave periods when the gap spacing is the same, and when the incident regular wave reaches the resonance period, The phenomenon of wave rising in the narrow gap flow field is obvious. With the increase of the gap spacing, the resonance period of the flow field between the narrow slits increases. When the wavelength is too large, the narrow gap has a shielding effect on the internal and external flow field, and there is no obvious wave surface rise between the narrow gaps. When the wavelength is further reduced to less than 1 times of the captain, the wave can enter the narrow slot and increase the wave surface. The smaller the gap is, the more violent the movement of the fluid between the narrow slits is. There can be one or more peaks between narrow slits, which are related to the aspect ratio L / B and the wavelength ratio 位 / L. (4) the fully coupled problem of wave / multi floating body motion / narrow slit oscillation is numerically analyzed. By comparing the movement and force of single floating body and multi floating body, it is found that the movement and force of free floating structure change greatly due to the effect of fluid movement between narrow slits. It shows that the influence of fluid motion between narrow slits on the structure can not be ignored. (5) by changing the incident direction of waves, the flow field between two floating structures under the action of oblique and transverse waves is numerically simulated. The wave surface rising and the fluid movement in the narrow slot are analyzed under the action of transverse wave and oblique wave. Combined with the results of wave welcome calculation, the movement and force of three kinds of wave downward floating body are compared and analyzed, and the conclusion that oblique wave is more dangerous than other working conditions is obtained.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE95

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