(3.238.186.43) 您好!臺灣時間:2021/02/26 13:02
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:陳昌業
研究生(外文):Chen, Chang-Yeh
論文名稱:應用雙互換邊界元素法解析波流場中大型圓柱之波壓
論文名稱(外文):DRBEM Analysis of Wave Pressure on a Large Cylinder in a Wave-Current Coexisting Field
指導教授:蕭松山蕭松山引用關係
指導教授(外文):Hsiao, Sung-Shan
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:75
中文關鍵詞:大型結構物波浪折-繞射水流雙互換邊界元素法波高分佈波壓
外文關鍵詞:large cylinderwave refraction-diffractioncurrentsDRBEM
相關次數:
  • 被引用被引用:0
  • 點閱點閱:128
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
本研究提供一有效之數值計算模式,來解析海底緩變區域內大型結構物,受入射波浪與均勻水流交互作用下結構物周邊受波流交互作用後之波高分佈及波壓變化情形。首先將解析領域依地形變化分為等深地形之外領域與緩變地形之內領域,其中外領域以緩變區與等深區之交界處為邊界,一直延伸至無窮遠處,考慮在無流之情況下則控制方程式為齊次之Helmholtz方程式;內領域包含大型結構物,控制方程式為含流效應之緩坡方程式,可重新整理為非齊次之Helmholtz方程式,應用Green第二定理改寫為積分方程式,再應用邊界元素法之新技巧—雙互換邊界元素法(Dual Reciprocity Boundary Element Method)將含未知數之非齊次項移項至等號左邊,即可經由矩陣求解得到圓柱周邊之速度勢。
在建立數值模式後,首先在無水流作用之情形下,將數值解與解析解作一比較,再加入水流效應,並與前人研究如蕭等(1998)之實驗結果比較均相當吻合,驗證數值模式之適用性;另亦計算不同之週期、水流速度、波流交會角度之情況下,作用於大型圓柱周邊之波壓分佈趨勢,以探討受水流影響下作用於大型圓柱周邊波壓之變化情形,其計算結果在定性上相當合理。
由以上結果顯示,本研究所提供一新的數值計算模式,可以有效地解析實際海洋工程上有關大型結構物周邊波浪折—繞射與水流共同效應之問題。

The purpose of this study is to analyze numerically the change of wave height and wave pressure caused by wave and uniform current interactions around a large cylinder on slowly varying water depth. In order to provide an effective numerical model, we employ the mild-slope equation with current effects as a basis, and apply dual-reciprocity boundary element method ( DRBEM ) to analyze the combined effects of wave refraction-diffraction and currents.
First ,we rearrange the mild-slope equation with current effects to a nonhomogeneous Helmholtz equation. Then, we transform it to an integral equation using Green’s theorem. Comparisons are made with the analytical solutions and numerical result with no current present. Good agreements are obtained. Using this numerical model, we calculate the change of wave pressure around a large cylinder located on slowly varying water depth with current effects. The numerical result show qualitative agreements.
From the results of this study, it shows that the numerical model propose here is efficient to solve practical ocean engineering problems which include the effects of wave refraction-diffraction and currents.

內 容 頁次
中文摘要 ------------------------------------------- Ⅰ
英文摘要 ------------------------------------------- Ⅱ
目錄 ----------------------------------------------- Ⅲ
圖目錄 --------------------------------------------- Ⅴ
符號表 --------------------------------------------- Ⅷ
第一章 導論 ---------------------------------------- 1
1-1 研究目的 --------------------------------------- 1
1-2 文獻回顧 --------------------------------------- 2
1-3 研究方法與內容 --------------------------------- 6
第二章 理論基礎 ----------------------------------- 9
2-1 領域劃分及控制方程式 --------------------------- 9
2-1-1 半無限領域 -------------------------------- 13
2-1-2 有限領域 ---------------------------------- 13
2-1-3 領域邊界面之邊界條件 ---------------------- 14
2-2 水流速度勢 ------------------------------------- 15
2-3 波浪速度勢 ------------------------------------- 17
2-4 波高與波壓 ------------------------------------- 19
第三章 數值方法 ------------------------------------ 22
3-1 邊界元素法 ------------------------------------- 22
3-2 雙互換邊界元素法之應用 ------------------------- 24
3-3 波壓之計算 ------------------------------------- 28
第四章 計算結果與討論 ------------------------------ 30
4-1 數值計算例 ------------------------------------- 30
4-2 數值模式驗證 ----------------------------------- 31
4-2-1 數值計算值與解析解之比對 ------------------ 31
4-2-2 數值計算值與實驗結果之比對 ---------------- 31
4-3 結果與討論 ------------------------------------- 35
第五章 結論 ---------------------------------------- 67
參考文獻 ------------------------------------------- 69
謝 誌 ------------------------------------------- 74
作者簡歷 ------------------------------------------- 75

1.Baddour, R.E. & S. Song, “On the Interaction Between Waves and Currents”, Ocean Engng., Vol. 17, No. 1/2, pp. 1~21 (1990, a).
2.Baddour, R.E. & S. Song, “Interaction of Higher-Order Waves with Uniform Currents”, Ocean Engng., Vol. 17, No. 6, pp. 551~558 (1990, b).
3.Berkhoff, J.C.W., “Computation of Combined Refraction-Diffraction”, Proc. of 13th Int. Conf. on Coastal Eng., Van D.C., Canada, pp. 471~490 (1972).
4.Booij, N., “Gravity Waves on Water with Non-uniform Depth and Current”, Communication on Hydraulics, Report No. 81-1, Dept. of Civil Eng., Delft Univ. of Technology, The Netherlands (1981).
5.Isaacson, M. & K.F. Cheung, “Time-Domain Solution for Wave-Current Interactions with a Two-Dimensional Body”, Appl. Ocean Res., Vol. 15, No. 1, pp. 39~52 (1993).
6.Isaacson, M., “Wave Effects on Offshore Structure-Some Recent Advances”, Proc. of the Special Offshore Symposium China, Beijing, China, pp. 10~15 (1994).
7.Iwagaki, Y. & T. Asano, “Hydrodynamic Forces on a Circular Cylinder Combined Wave and Current Loadiag”, Proc. of 19th Int. Conf. on Coastal Eng., pp. 2857~2874 (1984).
8.Karadeniz, H., “Wave-Current and Fluid-Structure Interaction Effects on the Stoachastic Analysis of Offshore Structures”, Int. J. Offshore and Polar Engineering, Vol. 3, No. 2, pp. 107~114 (1993).
9.Kirby, J.T., “A Note on Linear Surface Wave-Current Interaction over Slowly Varying Topography”, J. Geophys. Res., Vol. 89, No. C1, pp. 745~747 (1984).
10.Lewis, R.I., Vortex Element Methods for Fluid Dynamic Analysis of Engineering Systems, Cambridge University Press, Cambridge, 566 pp. (1991).
11.Li, Y.C., F.L. Wang & H.G. Kang, “Wave-Current Forces on Slender Circular Cylinders”, China Ocean Eng., Vol. 5, No. 5, pp. 287~310 (1991).
12.Lin, M.C. & Y.C. Hsu, “Finite/Boundary Element Analysis of Combined Wave Refraction-Diffraction and Currents”, 10th Ocean Engineering Symposium, The Society of Naval Architects of Japan, pp. 125~131 (1991).
13.Longuet-Higgins, M.S. & R.W. Stewart, “Changes in the Form of Short Gravity Waves on Long Waves and Tidal Currents”, J. Fluid Mech., Vol. 8, pp. 565~583 (1960).
14.Longuet-Higgins, M.S. & R.W. Stewart, “The Changes in Amplitude of Short Gravity Waves on Steady Non-uniform Currents”, J. Fluid Mech., Vol. 10, pp. 529~549 (1961).
15.Nardini, D. & C.A. Brebbia, “A new Approach to Free Vibration Analysis using Boundary Elements”, Boundary Element Methods in Eng., ed. C.A. Brebbia, Springer-Verlag, Berlin, New York (1982).
16.Partridge, P.W. & Brebbia, C.A. & Wrobel, L.C. “The Dual Reciprocity Boundary Element Method”, Computational Mechanics Publication, Southampton Boston, UK (1992).
17.Peregrine, D.H. & I.G. Jonsson, “Interaction of Waves and Currents”, Miscellaneous Report No. 83-6, U.S. Army Corps of Engineers, Coastal Engineering Research Center (1983)
18.Poulin, S., “A Perturbation-BEM for Diffraction of Water Waves on Varying Water Depth”, Boundary Element Technology XI, Computational Mechanics Publications, Springer-Verlag, Berlin, pp. 31~40 (1996).
19.Putnam, Johnson, “The Dissipation of Wave Energy by Bottom Friction”, Transactions, A.G.U. Vol. 30, No. 3 (1949).
20.Rangogni, R., “A Simple Procedure to Solve the Mild-Slope Equation using BEM and Perturbation Technique-Part-I”, Boundary Elements X, Vol. 1 ed. C.A. Brebbia, Computational Mechanics Publications, Springer-Verlag, Berlin (1988).
21.Sarpkaya, T. & M. Isaacson, Mechanics of Wave Forces on Offshore Structures, Van Nostrand Reinhold, New York, 651 pp. (1981).
22.Teng. B. & Y.C. Li, “Estimation of Wave-Current Force Coefficient on Inclined Cylindet in Random Waves”, Proc. Instn Civ. Engrs. Wat., Marit. & Energy, Vol. 96, pp. 1~7 (1992).
23.Thomas, G.P., “Wave-Current Interactions: An Experimental and Numerical Study. Part 1. Linear Waves”, J. Fluid Mech., Vol. 110, pp. 457~474 (1981).
24.Watanabe, R.K., “The Effect of Wave-Current Interactions on the Hydrodynamic Loading of Large Offshore Structures”, Ph.D. Thesis, Texas A&M University (1982).
25.Zhao, R. and O.M. Faltinsen, “Interaction Between Waves and Current on a Two-Dimensional Body in the Free Surface”, Appl. Ocean Res., Vol. 10, No. 2, pp. 87~99 (1988).
26.Zhu, S., “A New DRBEM Model for Wave Refraction and Diffraction”, Eng. Analysis with Boundary Element, Vol. 12, pp. 261~274 (1993).
27.Zhu, S., & Y. Zhang, “Combined Refraction and Diffraction of Short Waves using the Dual-Reciprocity Boundary Element Method”, Applied Ocean Res., Vol. 17, pp. 315~322 (1995).
28.黃煌煇、林呈、林西川,「波浪在均勻水流流場中之特性變化」,港灣技術,第一期,pp. 51~75 (1985)。
29.林銘崇、許永誠,「波浪折射-繞射與水流共同效應之有限-邊界元素解析」,國立臺灣大學造船工程學研究所研究報告第227號,臺北 (1986)。
30.陳陽益、莊文傑,「波流交互作用理論之初步探討」,第十二屆海洋工程研討會論文集,pp. 248~265 (1990)。
31.林銘崇、蕭松山,「波浪折射-繞射與水流之共同效應」,第十二屆海洋工程研討會論文集,臺中,pp. 221~235 (1990)。
32.尤學一、陶建華,「流影響下非線性波對大尺度物體的載荷」,天津大學學報,第二期,pp. 32~37 (1992)。
33.林銘崇、胡念嘉、蕭松山,「應用雙互換邊界元素法解析波浪折-繞射與水流共同效應」,第十九屆海洋工程研討會論文集,pp. 67~72 (1997)。
34.蕭松山、何松璟,「波流場中大型圓柱之流體力」,第十九屆海洋工程研討會論文集,pp. 263~270 (1997)。
35. 蕭松山、黃澄富、陳昌業,「波流場中大型圓柱波壓之研究」,第二十屆海洋工程研討會論文集,pp. 313~320 (1998)。

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔