發(fā)布時間：2018-07-02 07:04

  本文選題：OpenFOAM + 數(shù)值波流水槽　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：海上風(fēng)力發(fā)電在我國屬于起步階段，海上風(fēng)電風(fēng)機(jī)支撐結(jié)構(gòu)建設(shè)有很多問題亟需進(jìn)一步研究。海上風(fēng)機(jī)支撐結(jié)構(gòu)除了受風(fēng)機(jī)傳遞的風(fēng)荷載外，還受到波浪和水流共同作用，準(zhǔn)確計算波流荷載對于海上風(fēng)機(jī)結(jié)構(gòu)的設(shè)計有著重要意義。因此，研究海上風(fēng)機(jī)支撐結(jié)構(gòu)在波流共同作用下的水動力荷載對于海上風(fēng)電場建設(shè)具有重要的應(yīng)用價值。本文基于開源程序OpenFOAM建立了三維數(shù)值波浪水槽與波流水槽，對波浪、水流、海上風(fēng)機(jī)基礎(chǔ)結(jié)構(gòu)的相互作用進(jìn)行了模擬研究，主要內(nèi)容和結(jié)論如下。 （1）將動量分布源造波法引入OpenFOAM，采用流體體積函數(shù)（VOF）方法捕捉自由水面運動，利用OpenFOAM中的兩相流模型求解不可壓縮的雷諾方程，建立了三維數(shù)值波浪水槽。 （2）數(shù)值波浪水槽變化時空步長的算例測試結(jié)果表明，以下取值能在有限計算量的條件下獲得較好的波浪模擬結(jié)果：水平方向步長取為1/100波長，波高范圍內(nèi)垂向空間網(wǎng)格數(shù)不低于10，，推薦網(wǎng)格長寬比為1.8左右，其余垂向網(wǎng)格上下均減疏；時間離散采用動態(tài)時間步，最大時間步長為1/100波浪周期，克朗數(shù)不超過0.2。 （3）應(yīng)用建立的模型模擬了波浪作用下直立圓柱周圍的波高、流速和壓強(qiáng)分布，模擬結(jié)果與實驗值吻合較好，證明建立的三維數(shù)值波浪水槽能夠較好模擬波浪與結(jié)構(gòu)物的相互作用。 （4）在數(shù)值波浪水槽的基礎(chǔ)上，利用在底部設(shè)置入流和出流邊界的方法建立了三維數(shù)值波流水槽，波流模擬結(jié)果與已有實驗結(jié)果有較好的一致性。 （5）將所建立的三維數(shù)值波流水槽模型應(yīng)用于江蘇響水海上風(fēng)電復(fù)合筒型基礎(chǔ)的波流荷載研究，分別分析了純波、純流、波流共同作用下筒型基礎(chǔ)周圍的流動特性和基礎(chǔ)結(jié)構(gòu)所受的荷載。
[Abstract]:Offshore wind power generation belongs to the initial stage in China. There are many problems in offshore wind turbine supporting structure construction that need further study. In addition to the wind load transmitted by the fan, the supporting structure of offshore fan is also subjected to the interaction of waves and currents. It is of great significance to accurately calculate the wave-current load for the design of offshore fan structure. Therefore, the study of hydrodynamic load of offshore fan supporting structure under the action of wave and current has important application value for offshore wind farm construction. Based on OpenFOAM, a three-dimensional numerical wave flume and a wave-current flume are established in this paper. The interaction of wave, current and offshore fan infrastructure is simulated and studied. The main contents and conclusions are as follows: (1) the momentum distribution source wave-making method is introduced into OpenFOAM, the fluid volume function (VOF) method is used to capture the free water surface motion, and the two-phase flow model in OpenFOAM is used to solve the incompressible Reynolds equation. Three-dimensional numerical wave flume is established. (2) numerical wave flume variation is measured by an example. Better wave simulation results can be obtained with the following values: the horizontal step length is 1 / 100 wavelength, the vertical spatial mesh number is not less than 10 in the wave height range, and the recommended grid aspect ratio is about 1.8. The other vertical meshes are thinned up and down, the time discretization is dynamic time step, the maximum time step is 1 / 100 wave period, and the number of kroner is not more than 0.2. (3) the wave height around the vertical cylinder under wave action is simulated by using the established model. The distribution of velocity and pressure is in good agreement with the experimental data. It is proved that the three-dimensional numerical wave flume can simulate the interaction between wave and structure. (4) on the basis of numerical wave flume, Using the method of setting inlet and outlet boundaries at the bottom, a three-dimensional numerical wave-current flume is established. The simulation results are in good agreement with the experimental results. (5) the established three-dimensional numerical wave-current flume model is applied to the study of wave-current loads on the composite cylinder foundation of Xiangshui offshore wind power plant in Jiangsu Province, and the pure wave and pure current are analyzed respectively. The characteristics of the flow around the cylindrical foundation and the load on the foundation structure under the interaction of waves and currents.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU476;TV139.2

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