請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60169
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 周逸儒(Yi-Ju Chou) | |
dc.contributor.author | Ji-Ru Chiu | en |
dc.contributor.author | 邱繼儒 | zh_TW |
dc.date.accessioned | 2021-06-16T10:00:40Z | - |
dc.date.available | 2017-02-08 | |
dc.date.copyright | 2017-02-08 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-11-14 | |
dc.identifier.citation | 1 Richardson, L. F. (1920). “The Supply of Energy from and to Atmospheric Eddies.” Proc. Roy. SO 97(686): 354-373.
2 Taylor, G. I. (1931). “Effect of Variation in Density on the Stability of Superposed Streams of Fluid.” Proc. R. Soc. 132: 499-523. 3 MILES, J. W. (1961). “On the stability of heterogeneous shear flows.” J. Fluid Mech. 10: 496-508. 4 Abarbanel, H. D. I., et al. (1984). “Richardson Number Criterion for the Nonlinear Stability of Three-Dimensional Stratified Flow.” Physical Review Letters 52(26): 2352-2355. 5 Deardorff, J. W. (1973). “An Explanation of Anomalously Large Reynolds Stresses Within the Convective Planetary Boundary Layer.” Journal of the Atmospheric Sciences 30: 1071-1076. 6 Mellor, G. L. (1973). “Analytical prediction of the properties of stratified planetary surface layers.” Journal of the Atmospheric Sciences 30: 1061-1069. 7 W. S. L. a. M. (1973). “Prediction of the Monin-Obukhov similarity functions from an invariant model of turbulence.” Journal of the Atmospheric Sciences 30: 1340-1345. 8 Yamada, T. (1975). “The critical richardson number and the radio of the eddy tranport coefficients obtained from a turbulence closure model.” Journal of the Atmospheric Sciences 32: 926-933. 9 ELLISON, T. H. (1957). “Turbulent transport of heat and momentum from an infinite rough plane.” Journal of Fluid Mechanics 2(5): 456-466. 10 Townsend, A. A. (1958). “The effects of radiative transfer on turbulent flow of a stratified fluid.” Journal of Fluid Mechanics 4(4): 361-375. 11 Arya, S. P. S. (1972). “The critical condition for the maintenance of turbulence in stratified flows.” Quart. J. R. Met. SOC 98(416): 264-273. 12 Burchard, H. and H. Baumert (1995). “On the performance of a mixed-layer model based on the κ-ε turbulence closure.” Journal of Geophysical Research 100(C5): 8523-8540. 13 Turner, J, S. (1973), “Buoyancy effect in fluids.” Cambridge Univ. Press, New York. 14 J.Rohr, J. (1988). “Growth and decay of turbulence in a stably stratified shear flow.” J . Fluid Mech. 195: 77-111. 15 Vito A. Vanoni (1946). “Transportation of Suspended Sediment by Water.” Transactions of the American Society of Civil Engineers(111):67-102. 16 H. A. Einstein, Ning Qian (1955), “Effects of heavy sediment concentration near the bed on velocity and sediment distribution” M. R. D. sediment series 8 17 Tanga, P., et al. (1999). 'On the Size Distribution of Asteroid Families: The Role of Geometry.' Icarus 141(1): 65-78. 18 Lau, Y. and V. H. Chu (1987). “Suspended sediment effect on turbulent diffusion.” paper presented at 22nd LAHR Congress, Lausanne, France. 19 Garg, R. P., et al. (2000). “Stably stratified turbulent channel flows. I. Stratification regimes and turbulence suppression mechanism.” Physics of Fluids 12(10): 2569-2594. 20 Winterwerp, J. C. (2001). “Stratification effects by cohesive and noncohesive sediment.” JOURNAL OF GEOPHYSICAL RESEARCH, 106(C10): 22559-22574. 21 Chou, Yi-Ju., & Fringer, O. B. (2008). “Modeling dilute sediment suspension using large-eddy simulation with a dynamic mixed model.” Physics of Fluids, 20(11), 115103. doi:10.1063/1.3005863. 22 Ozdemir, C. E., Hsu, T.-J., & Balachandar, S. (2010). “A numerical investigation of fine particle laden flow in an oscillatory channel: the role of particle-induced density stratification.” Journal of Fluid Mechanics, 665, 1-45. doi:10.1017/s0022112010003769. 23 Yu, X., Hsu, T.-J., & Balachandar, S. (2013). “A spectral-like turbulence-resolving scheme for fine sediment transport in the bottom boundary layer.” Computers & Geosciences, 61, 11-22. doi:10.1016/j.cageo.2013.07.021. 24 Cantero, M. I., Balachandar, S., Cantelli, A., Pirmez, C., & Parker, G. (2009). “Turbidity current with a roof: Direct numerical simulation of self-stratified turbulent channel flow driven by suspended sediment.” JOURNAL OF GEOPHYSICAL RESEARCH, 114(C3). doi:10.1029/2008jc004978. 25 Cantero, M. I., Balachandar, S., & Parker, G. (2009). “Direct numerical simulation of stratification effects in a sediment-laden turbulent channel flow.” Journal of Turbulence, 10, N27. doi:10.1080/14685240903159197. 26 Shringarpure, M., Cantero, M. I., & Balachandar, S. (2012). “Dynamics of complete turbulence suppression in turbidity currents driven by monodisperse suspensions of sediment.” Journal of Fluid Mechanics, 712, 384-417. doi:10.1017/jfm.2012.427. 27 Geyer, W. R. (1993). “The Importance of Suppression of Turbulence by Stratification on the Estuarine Turbidity Maximum.” Estuaries, 16(1), 113-125. 28 Trowbridge, J. H., & Kineke, G. C. (1994). “Structure and dynamics of fluid muds on the Amazon Continental Shelf.” Journal of Geophysical Research, 99(C1), 865. doi:10.1029/93jc02860. 29 Trowbridge, J. H. (1992). “A simple description of the deepening and structure of a stably stratified flow driven by a surface stress.” Journal of Geophysical Research, 97(C10), 15529. doi:10.1029/92jc01512. 30 Einstein, & Hans Albert. (1950). “Bed-load function for sediment transportation.” U. S. D. A. Tech. Bulletin, 1026. 31 Yalin, M. S. (1977). “Mechanics od sediment transport.” Pergamon Press, Oxford, England. 32 Fernandez-Luque, R. (1974). “Erosion and Transport of bed-load sediment.” Disertaion, KRIPS Repro BV, Meppel, The Netherlands. 33 Nakagawa, H. (1980). “Sand Bed Instability Due to Bed Load Motion.” Journal of the Hydraulics Division, 106(12), 2029-2051. 34 Ruiter, J. C. C. d. (1983). “Incipient Motion and Pick-UP of Sediment as Function of Local Bariables.” Delft Hydralics Laboratory, Report R 675-XI, Delft, The Netherlands. 35 Rijn, L. C. v. (1984). “Sediment Pick_Up Function.” Delft Hydralics Laboratory, Report R 675-XI, Delft, The Netherlands. 36 Parchure, T. M., Mehta, A. J., & ASCE, M. (1985). “Erosion of Soft Cohesive Sediment Deposits.” J. Hydraul. Eng., 110(10). 37 Zang, Y., Street, R. L., & Koseff, J. R. (1994). “A Non-staggered Grid, Fractional Step Method for Time-Dependent Incompressible Navier-Stokes Equations in Curvilinear Coordinates.” Journal of Computational Physics, 114(1), 18-33. 38 Cui, A., & Street, R. L. (2004). “Large-Eddy Simulation of Coastal Upwelling Flow.” Environmental Fluid Mechanics, 4(2), 197. 39 Leonard, B. P. (1979). “A stable and accurate convectine modelling procedure based on quadratic upstream interpolation” Comput. Methods Appl. Mech Eng., 19, 69. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60169 | - |
dc.description.abstract | 本研究使用大渦流模擬(LES)結合動力混合模型(DMM)模擬次要網格,來探討一等壓力梯度驅動的水平剪力所造成之泥沙密度層化流體運動,我們於底床引入掏刷函數(pick-up function)來模擬掏刷的現象,藉由掏刷率與泥沙沉降速度的大小作為分層效應強弱的控制參數。
由模擬結果發現當掏刷率較大時,分層效應會較強烈,使紊流動能相較於無密度層化效應之流動具有某程度上的衰減,造成垂直底床方向的質量及動量的傳輸受到抑制,甚至在極大掏刷率的情況下,流場中的紊流動將會完全受到抑制,流動進而發展成層流(laminar flow);當沉降速度越大,泥沙在水域當中的影響時間較短,故紊流動能受分層效應的影響相對較弱,並且透過理想的數學模型加以分析沉降速度與濃度分布間的關係,並同時透過梯度及通量理查森數(Rig、Rif)來分析層流化與否的關鍵。 | zh_TW |
dc.description.abstract | In this study, we use large-eddy simulation (LES) with a dynamic mixed model (DMM) to investigate the stratified channel flow due to sediment resuspension. The flow is driven by a constant pressure gradient. We apply a pick-up function at the bottom to simulate the erosional phenomenon. The empirical erosion rate and settling velocity are chosen as parameters to control the strength of density stratification.
Based on our results, we found that if the erosion rate is greater, it enhances density stratification, suppressing the vertical transport of mass and momentum. In this case, turbulent kinetic energy decays to a certain degree. In the case of the greatest erosion rate, the turbulent kinetic energy is totally damped, and the flow eventually becomes the laminar flow. For the larger settling velocity, the time sediment is retained in water column is shorter, and the influence of density stratification is relatively weak. The analysis of Richardson number is presented. Moreover, we analyze the relation between settling velocity and sediment concentration profiles using the self-similarity analysis. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T10:00:40Z (GMT). No. of bitstreams: 1 ntu-105-R03543065-1.pdf: 24132009 bytes, checksum: a9f83589f5bb1250b7e670fbc4ff1a33 (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | Chapter 1 緒論 1
1.1 前言 1 1.2 研究動機 2 1.3 文獻回顧 3 1.3.1 理查森數 3 1.3.2 密度分層流動 6 1.3.3 解析解回顧 10 (i)勞斯分布 10 (ii)自我相似解 11 Chapter 2 研究方法 15 2.1 統御方程式 15 2.2 大渦流模擬 16 Chapter 3 模擬設置 18 3.1 模擬參數及邊界條件 18 3.2 泥沙之邊界條件 19 3.3 初始條件 21 3.3.1 速度場 21 3.3.2 濃度場 23 Chapter 4 結果與討論 24 4.1 平均量及擾動量 25 4.1.1 濃度分布 25 4.1.2 速度分布 27 4.1.3 渦流結構 33 4.2 紊流動能平衡 36 4.3 理查森數分析 41 4.4 濃度分布與沉降速度之關係 48 4.4.1 自我相似解析解 48 4.4.2 數值模擬解 51 Chapter 5 總結與討論 55 附錄 57 參考文獻 63 | |
dc.language.iso | zh-TW | |
dc.title | 底泥再懸浮引起密度層化現象的大渦流模擬 | zh_TW |
dc.title | Large-eddy simulation of suspension-induced density stratification in turbulent flow | en |
dc.type | Thesis | |
dc.date.schoolyear | 105-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳世楠(Shih-Nan Chen),戴璽恆(Hsi-Heng Dai),蔡武廷(Wu-Ting Tsai) | |
dc.subject.keyword | 大渦流模擬,密度分層效應,理查森數,剪力分層流,層流化流, | zh_TW |
dc.subject.keyword | large-eddy simulation,density stratification,Richardson number,stratified shear flow,turbulence suppression., | en |
dc.relation.page | 68 | |
dc.identifier.doi | 10.6342/NTU201603741 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-11-15 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
顯示於系所單位: | 應用力學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-105-1.pdf 目前未授權公開取用 | 23.57 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。