本文選題：三維數(shù)值模擬　切入點(diǎn)：結(jié)構(gòu)網(wǎng)格　出處：《大連理工大學(xué)》2014年碩士論文

【摘要】：近年來(lái),洪澇災(zāi)害的頻繁發(fā)生,增加了水利樞紐工程中泄洪的研究意義。不論高壩還是低壩,泄洪都是一個(gè)值得深入研究的復(fù)雜水氣兩相流難題,眾多學(xué)者投入大量精力開發(fā)可以研究泄洪的方法。21世紀(jì)前,對(duì)泄洪的研究方法主要集中在物理模型試驗(yàn)上,隨著近些年計(jì)算機(jī)科學(xué)技術(shù)的發(fā)展和計(jì)算流體力學(xué)理論的完善,對(duì)數(shù)值模擬方法的研究也逐漸展開。 本文首先對(duì)現(xiàn)階段水氣兩相流的研究成果進(jìn)行了概述,并探討了模擬泄水建筑物消能的意義。在此基礎(chǔ)上敘述了廣大學(xué)者對(duì)數(shù)值模擬研究的理論和方法,通過(guò)結(jié)合物理模型試驗(yàn),對(duì)比兩者的優(yōu)點(diǎn)和缺點(diǎn),分析其中的不足,并找出互補(bǔ)的方法。本文研究工作主要如下： 1.對(duì)流體動(dòng)力學(xué)的基本理論進(jìn)行歸總敘述,總結(jié)出三大基本控制方程的通用表達(dá)形式。列舉研究?jī)上嗔鞯膸追N常用方法,對(duì)比幾種紊流兩方程模型,總結(jié)其分別適用的場(chǎng)合。簡(jiǎn)要敘述紊流的邊界條件和模擬自由水面的方法。 2.介紹某水利樞紐工程的概況,模型試驗(yàn)的注意事項(xiàng),模型的設(shè)計(jì)、安裝以及試驗(yàn)方法。分析正堰和側(cè)堰聯(lián)合泄流時(shí)的水庫(kù)泄流能力、壓強(qiáng)分布、沿程水面線、水流流態(tài)等；對(duì)側(cè)堰單獨(dú)泄流時(shí)的流態(tài)進(jìn)行分析。對(duì)比兩種試驗(yàn)?zāi)Ｐ驮谕粠?kù)水位下時(shí)的泄流流態(tài),得出側(cè)堰泄流對(duì)正堰的影響。 3.介紹數(shù)值模擬過(guò)程中所用到的軟件,把求解CFD軟件的幾種核心算法進(jìn)行分類,總結(jié)這幾種算法各自適應(yīng)的場(chǎng)合。對(duì)物理模型進(jìn)、出口邊界的適用條件和對(duì)應(yīng)參數(shù)的計(jì)算公式進(jìn)行歸納。并由一個(gè)簡(jiǎn)單的算例來(lái)總結(jié)Fluent的求解流程。 4.適當(dāng)簡(jiǎn)化實(shí)際工程,建立其三維可視化模型,用ICEM對(duì)其進(jìn)行網(wǎng)格劃分,選擇合理的進(jìn)、出口邊界條件,采用三維κ-ε雙方程模型,利用幾何重建格式非恒定流迭代求解生成自由水面,復(fù)雜的幾何邊界采用非結(jié)構(gòu)化網(wǎng)格進(jìn)行處理,從庫(kù)區(qū)到河道下游進(jìn)行全程的水氣二相流數(shù)值模擬,對(duì)比結(jié)構(gòu)網(wǎng)格和非結(jié)構(gòu)網(wǎng)格的精確性和易用性。用后處理軟件對(duì)計(jì)算結(jié)果進(jìn)行可視化分析,把計(jì)算結(jié)果與實(shí)測(cè)數(shù)據(jù)進(jìn)行多方面對(duì)比,得出結(jié)論：數(shù)值模擬技術(shù)應(yīng)用在實(shí)際工程的泄洪消能方面研究是可行的。
[Abstract]:In recent years, the frequent occurrence of flood and waterlogging has increased the research significance of flood discharge in water conservancy project. Whether high dam or low dam, flood discharge is a complicated water and gas two-phase flow problem worthy of further study. Many scholars put a lot of energy into the development of flood discharge methods. Before the 21st century, the research methods of flood discharge mainly focused on physical model tests, with the development of computer science and technology and the improvement of computational fluid dynamics theory in recent years. The study of numerical simulation method is also gradually developed. In this paper, the research results of water and gas two-phase flow at present are summarized, and the significance of simulating the energy dissipation of drain structures is discussed. On this basis, the theories and methods of numerical simulation are described. By combining the physical model test, the advantages and disadvantages of the two are compared, the shortcomings are analyzed, and complementary methods are found. The main work of this paper is as follows:. 1. The basic theory of hydrodynamics is summarized, and the general expression of three basic governing equations is summarized. Several common methods for studying two-phase flow are listed, and several turbulent two-equation models are compared. The boundary conditions of turbulent flow and the method of simulating free water surface are briefly described. 2.Introduces the general situation of a water conservancy project, matters needing attention in model test, design, installation and test method of the model. The discharge capacity, pressure distribution, water surface line along the course and the flow pattern of the reservoir under the combined discharge of positive Weir and Side-Weir are analyzed. The flow pattern of the side Weir under the same water level is analyzed and the influence of the side Weir discharge on the positive Weir is obtained by comparing the two test models under the same reservoir water level. 3.Introduces the software used in numerical simulation, classifies several core algorithms for solving CFD software, sums up the situation of each of these algorithms, and advances the physical model. The applicable conditions of the exit boundary and the calculation formulas of the corresponding parameters are summed up, and a simple example is used to summarize the flow of the Fluent solution. 4. Simplify the actual engineering properly, establish its 3D visualization model, mesh it with ICEM, select reasonable entry and exit boundary conditions, and adopt the three-dimensional 魏-蔚 two-equation model. The free water surface is generated by iteratively solving the unsteady flow with geometric reconstruction scheme, the complex geometric boundary is processed by unstructured mesh, and the numerical simulation of water and gas two-phase flow is carried out from the reservoir area to the downstream of the river. The accuracy and ease of use of structural and unstructured meshes are compared. The calculation results are visually analyzed with post-processing software, and the calculated results are compared with the measured data in many aspects. It is concluded that it is feasible to apply numerical simulation technology to the study of flood discharge and energy dissipation in practical engineering.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV135.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃振宇,徐文燦;湍流射流的數(shù)值模擬[J];北京理工大學(xué)學(xué)報(bào);1999年06期

2 王興雙,劉莉;長(zhǎng)側(cè)堰分流渠槽的水力計(jì)算[J];東北水利水電;2002年08期

3 謝佩珍;明渠側(cè)堰段涌波高與泄流量的試驗(yàn)研究[J];福州大學(xué)學(xué)報(bào)(自然科學(xué)版);1996年06期

4 姚征,陳康民;CFD通用軟件綜述[J];上海理工大學(xué)學(xué)報(bào);2002年02期

5 史峰,徐忠;k-ε兩方程模型的改進(jìn)及其應(yīng)用[J];空氣動(dòng)力學(xué)學(xué)報(bào);1991年02期

6 邢景棠,周盛,崔爾杰;流固耦合力學(xué)概述[J];力學(xué)進(jìn)展;1997年01期

7 魯婧;王向東;關(guān)見朝;王昭艷;;基于Fluent的明渠水流三維數(shù)值模型驗(yàn)證[J];科學(xué)技術(shù)與工程;2012年32期

8 張開發(fā);朱吉賢;;側(cè)堰溢洪道上建閘設(shè)計(jì)及側(cè)槽水力計(jì)算的一般步驟[J];內(nèi)蒙古水利;2008年05期

9 陳黎,刁明軍;表孔泄洪的水氣二相流數(shù)值模擬[J];四川水力發(fā)電;2002年01期

10 錢煒祺,蔡金獅;不可壓湍流流動(dòng)K-ε兩方程模型參數(shù)辨識(shí)[J];水動(dòng)力學(xué)研究與進(jìn)展(A輯);2000年04期

，

本文編號(hào)：1689778