非等直徑并列四圓柱繞流特性數(shù)值研究
發(fā)布時(shí)間：2023-10-02 01:20
實(shí)際工程應(yīng)用中許多現(xiàn)象都與鈍體繞流息息相關(guān),例如電廠的化學(xué)反應(yīng)塔、橋墩、近海石油勘探平臺(tái)、人在游泳時(shí)的手指等。我們都知道單元柱和兩圓柱繞流作為鈍體繞流的典型案例已經(jīng)被較全面的研究過(guò)了,而多圓柱的繞流相關(guān)研究還不完善。因此本研究著重研究直徑比D/d(D是中間兩圓柱的直徑,d是外側(cè)兩圓柱的直徑)和間隙比g*(=g/Dm,g 是圓柱和圓柱之間的垂直間隙,Dm=(D+d)/2是特征長(zhǎng)度)的不同對(duì)于四圓柱繞流流場(chǎng)中的流動(dòng)結(jié)構(gòu)、渦脫頻率以及圓柱上受力的影響。在目前的數(shù)值研究中,通過(guò)測(cè)量作用在每個(gè)圓柱、四圓柱系統(tǒng)上的作用力((?))和渦脫頻率(f),研究分析了 D/d=0.4-1.6和g*=0.25-5對(duì)四圓柱系統(tǒng)周圍流場(chǎng)的影響。本次數(shù)值研究的雷諾數(shù)為100。隨著D/d和g*的變化,整個(gè)流場(chǎng)的流動(dòng)結(jié)構(gòu)可以被劃分為:單鈍體流動(dòng),混雜流動(dòng),近似周期流動(dòng),周期流動(dòng)以及連鎖流動(dòng)。完整的直徑比-間隙比(D/d-g*)圖可以被總結(jié)出來(lái)。最后觀察分析作用在各圓柱和四圓柱系統(tǒng)上的力((...
【文章頁(yè)數(shù)】：63 頁(yè)
【學(xué)位級(jí)別】：碩士
【文章目錄】：
摘要
Abstract
Acknowledgements
Nomenclature
Chapter1 Introduction
1.1 Backgrounds
1.2 Objectives
1.3 Thesis outline
Chapter2 Domestic and international reasearch status
2.1 Research status of flow around multiple cylinders
2.1.1 Flow around two cylinders in a side-by-side arrangement
2.1.2 Flow around two cylinders of different diameters
2.1.3 Flow around multiple cylinders in various arrangement
2.2 Summary
Chapter3 Computation details and validation
3.1 Governing equations
3.2 Computational domain
3.3 Mesh resolution and validation
3.4 Summary
Chapter4 Results and discussion
4.1 Classification of flow patterns
4.1.1 Single-bluff body flow
4.1.2 Chaotic flow
4.1.3 Quasi-periodic flow
4.1.4 Periodic flow
4.1.5 Interlocked flow
4.2 Strouhal number
4.2.1 Power spectral density of the fluctuating lift force
4.2.2 Vortex shedding frequency
4.3 Force coefficients
4.3.1 Time-averaged drag coefficients and lift coefficients on cylinder1 and cylinder 2
4.3.2 Root-mean-square drag coefficients and lift coefficients on cylinder1 and cylinder 2
4.3.3 Total mean drag coefficients on the four-cylinder system
4.3.4 Total root-mean-square drag and lift coefficients on the four-cylinder system
4.4 The largest and smallest drag coefficients
4.5 Summary
Conclusions
References
非等直徑并列四圓柱繞流特性數(shù)值研究摘要
本文編號(hào)：3849817
【文章頁(yè)數(shù)】：63 頁(yè)
【學(xué)位級(jí)別】：碩士
【文章目錄】：
摘要
Abstract
Acknowledgements
Nomenclature
Chapter1 Introduction
1.1 Backgrounds
1.2 Objectives
1.3 Thesis outline
Chapter2 Domestic and international reasearch status
2.1 Research status of flow around multiple cylinders
2.1.1 Flow around two cylinders in a side-by-side arrangement
2.1.2 Flow around two cylinders of different diameters
2.1.3 Flow around multiple cylinders in various arrangement
2.2 Summary
Chapter3 Computation details and validation
3.1 Governing equations
3.2 Computational domain
3.3 Mesh resolution and validation
3.4 Summary
Chapter4 Results and discussion
4.1 Classification of flow patterns
4.1.1 Single-bluff body flow
4.1.2 Chaotic flow
4.1.3 Quasi-periodic flow
4.1.4 Periodic flow
4.1.5 Interlocked flow
4.2 Strouhal number
4.2.1 Power spectral density of the fluctuating lift force
4.2.2 Vortex shedding frequency
4.3 Force coefficients
4.3.1 Time-averaged drag coefficients and lift coefficients on cylinder1 and cylinder 2
4.3.2 Root-mean-square drag coefficients and lift coefficients on cylinder1 and cylinder 2
4.3.3 Total mean drag coefficients on the four-cylinder system
4.3.4 Total root-mean-square drag and lift coefficients on the four-cylinder system
4.4 The largest and smallest drag coefficients
4.5 Summary
Conclusions
References
非等直徑并列四圓柱繞流特性數(shù)值研究摘要
本文編號(hào)：3849817
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