大地工程與科學計算研究室 主持教授

 國立臺灣海洋大學 顧承宇 特聘教授/總務長

Distinguished Professor Cheng-Yu Ku

主要經歷 (ACADEMIC POSITIONS)

國立台灣海洋大學 總務長 (2020/08~)

Vice President for General Affairs, , National Taiwan Ocean University

經濟部標準檢驗局離岸風力發電場技術審查委員(2020/06~)

Technical committee of offshore wind power, Bureau of Standards, Metrology & Inspection, Ministry of Economic Affairs, R.O.C.  (2020/06~)

國立台灣海洋大學 河海工程學系(所) 特聘教授 (2019/08~)

Distinguished Professor, Department of Harbor and River Engineering, National Taiwan Ocean University

科技部自然司防災學門專題研究計畫複審委員 (2018/01~)

Review Board, Department of Natural Sciences and Sustainable Development, Ministry of Science and Technology, R.O.C.

考試院考選部國家考試命題與閱卷委員 (2018年)

National committee, Ministry of Examination, R.O.C. (2018)

國立台灣海洋大學 河海工程學系(所) 教授 (2014/8~)

Professor, Department of Harbor and River Engineering, National Taiwan Ocean University

國立台灣海洋大學  應用地球科學研究所 合聘教授

Professor,  Institute of Applied Geosciences, National Taiwan Ocean University

國立臺灣海洋大學職業安全衛生中心 主任 (2018/8~)

Director, Center for Occupational Safety and Health, National Taiwan Ocean University (2018/8~)

國立臺灣海洋大學校工學院教師評審委員會委員(2018/8~2019/7)

The Faculty Promotion and Evaluation Committee, Engineering School, National Taiwan Ocean University (2015/8~2016/7)

國立臺灣海洋大學校教師評審委員會委員(2015/8~2016/7)

The Faculty Promotion and Evaluation Committee, National Taiwan Ocean University (2015/8~2016/7)

國立臺灣海洋大學河海工程系 副系主任(2013/3~2015/7)

Associate chairperson, Department of Harbor and River Engineering, National Taiwan Ocean University (2013/3~2015/7)

國立臺灣海洋大學 工學院 計算與模擬中心 主任(2011/1~2016/12)

Director, Computation and Simulation Center, National Taiwan Ocean University

國立臺灣海洋大學河海工程系 副教授(2011/7~2014/8)

Associate professor, Department of Harbor and River Engineering, National Taiwan Ocean University (2011/7~2014/8)

國立臺灣海洋大學河海工程系 助理教授(2008/8~2011/7)

Assistant professor, Department of Harbor and River Engineering, National Taiwan Ocean University (2008/8~2011/7)

專業經歷 (PROFESSIONAL AFFILIATIONS)

甲種職業安全衛生業務主管 (證書, 2018 10~)

Occupational safety and health affair managers (2018 10~)

國際岩石力學學會(ISRM)不連續變形分析法技術委員(2011~2015)

International Society for Rock Mechanics(ISRM) Commission on Discontinuous Deformation Analysis (2011~2015)

中華民國國家教育研究院 土木工程名詞審譯委員會大地領域審譯委員

National committee of geotechnical terms in civil engineering, National Academy for Educational Research, R.O.C. (2015~)

中華民國經濟部標準檢驗局 環境保護國家標準技術委員會委員(2013~2015)

Technical committee of environmental protection, Bureau of Standards, Metrology & Inspection, Ministry of Economic Affairs, R.O.C. (2013~2015)

中華民國經濟部標準檢驗局 土木工程及建築國家標準技術委員會委員(2012~2013)

Technical committee of civil engineering, Bureau of Standards, Metrology & Inspection, Ministry of Economic Affairs, R.O.C.  (2012~2013)

中華民國大地工程學會第十屆技術委員會副主任委員(2015/5~2017/3)

中華民國大地工程學會第十屆會務規劃及會員委員會委員(2015/5~2017/3)

中華民國大地工程學會 第九屆理事

中華民國大地工程學會第八屆會務規劃及會員委員會主任委員

2011 年國際計算與實驗工程科學研討會(ICCES MM)科技委員

中華民國大地工程學會第七屆教育委員會委員

第十四屆大地工程學術研討會執行委員會委員

財團法人中興工程顧問社 工程師, 研究員, 高級研究員兼組長(1993/6~2008/7)

獲獎紀錄 (HONORS AND AWARDS)

2019年國立臺灣海洋大學研究績優獎

2019, NTOU Research Excellence Award

2018年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2018, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2017年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2017, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2017年榮獲國立臺灣海洋大學 「傑出教學教師」(2017/7, 全校僅一位獲獎)

2017, DISTINGUISHED TEACHING AWARD, NTOU (only one position in NTOU)

2016年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2016, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2016年交通部運輸研究所合作研究計畫佳作研究獎 (2016/6)

2016, Project Award for Excellent Research Investigators, Institute of Transportation, MOTC, R.O.C.

2015年交通部運輸研究所合作研究計畫佳作研究獎 (2015/6)

2015, Project Award for Excellent Research Investigators, Institute of Transportation, MOTC, R.O.C.

2015年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2015, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2014年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2014, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2013年國立臺灣海洋大學「增進社會服務」獎勵

2013, NTOU PROMOTION OF SOCIAL SERVICES AWARD

2013年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2013, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2012年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2012, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2011年國立臺灣海洋大學獎勵特殊優秀人才獎勵 (科技部補助)

2011, NTOU for Ministry of Science and Technology Talent Subsidy Incentives by Faculty Members

2011年國立臺灣海洋大學校級教學優良教師

2011, Excellence in Teaching Award, NTOU

2011年行政院國科會優秀青年學者研究計畫獎勵 (個別型)

2011, Project Award for Excellent Junior Research Investigators, Ministry of Science and Technology, R.O.C.

2011年度國立臺灣海洋大學獎勵學術獎

2010 度國立臺灣海洋大學ESI資料庫高被引用論文獎勵

2010, ESI Highly Cited Paper Award, NTOU

2010 年國立臺灣海洋大學獎勵學術獎

2010 年岩盤工程研討會工程論文獎第一名

2010, Taiwan Rock Engineering Symposium, Research Paper Award First Place

2009 年國立臺灣海洋大學獎勵學術獎

2006 年岩盤工程研討會優良論文獎

2006, Taiwan Rock Engineering Symposium, Excellent Research Paper Award

國際學術服務 (ACADEMIC SERVICE)

2018迄今擔任國際知名學術期刊“Applied Sciences”編輯 ,Applied Sciences 期刊現為Web of sciencen所編列全球排名Q2之優良期刊。

Editorial Board Member of Applied Sciences (2018~, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

Section Board for “Earth Sciences and Geography” of Applied Sciences (2018~, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

Section Board for ‘Energy’ of Applied Sciences (2018~, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

Guest Editor of Special Issue “Leading Edge Technology on Groundwater Flow” of Applied Sciences (2020, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

Guest Editor of Special Issue “Heat and Mass Transfer: Advances in Heat and Mass Transfer in Porous Materials (Volume II)” of Applied Sciences (2020, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

Guest Editor of Special Issue “Heat and Mass Transfer: Fundamentals and Applications in Thermal Energy” of Applied Sciences (2019,, SCIE, IF 2.217, Q2, 67/148 in PHYSICS, APPLIED, JCR 2018)

2014迄今擔任國際知名學術期刊“JOURNAL OF MARINE SCIENCE AND TECHNOLOGY (JMST)” 編輯 , JMST 期刊為SCI, EI 收錄之優良期刊。

Editorial Board Member of JOURNAL OF MARINE SCIENCE AND TECHNOLOGY (a SCI international journal) 2014/8~

The international examiner of Doctor of Philosophy thesis, Griffith University, Australia (2015)

International reviewer of research proposal, National Center of Science and Technology Evaluation, Ministry of Education and Science, Astana, Republic of Kazakhstan, 2014.

International reviewer of research proposal, National Center of Science and Technology Evaluation, Ministry of Education and Science, Astana, Republic of Kazakhstan, 2011.

SCIENTIFIC COMMITTEE, ICCES Special Symposium on Meshless & Other Novel Computational Methods, 2011.

Invited speaker, International Conference Computational and Experimental Engineering and Science, 2011.

Session co-chairman, the 45th U.S. Rock Mechanics / Geomechanics Symposium, American Rock Mechanics Association. 2011.

Keynote speaker, International Conference Computational and Experimental Engineering and Science, 2010.

Session chairman, 2010 Young Southeast Asian Geotechnical Conference, Tawan.

學歷 (Education/Degrees)

美國賓州匹茲堡大學土木工程暨環境工程研究所 博士 (2002)

Ph.D., Civil and Environmental Engineering, University of Pittsburgh, U. S. A.

國立臺灣大學土木工程研究所 碩士 (1991)

Master in Civil Engineering, National Taiwan University,Taiwan

教師研究室

國立台灣海洋大學 河海工程二館   HRE2 508

研究生研究室

國立台灣海洋大學 河海工程二館   HRE2 514

20224 基隆市中正區北寧路2

E-mail: chkst26@mail.ntou.edu.tw

Tel: (02)2462-2192 ext. 6109 (研究室)

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本研究室獲國科會100年度優秀年輕學者計畫獎勵

本研究室顧承宇老師獲國科會100年度優秀年輕學者計畫獎勵, 為期三年.

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世界大學排名 海大擠進前400名

世界大學排名,國立台灣海洋大學首度擠進四○○大!英國《泰晤士報》高等教育特刊(Times Higher Education)日前公布二○一一至二○一二年世界大學排行榜調查報告,海洋大學排名在三五一到四○○名之間。

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Space–Time Radial Basis Function–Based Meshless Approach for Solving Convection–Diffusion Equations

Abstract:This article proposes a space–time meshless approach based on the transient radial polynomial series function (TRPSF) for solving convection–diffusion equations. We adopted the TRPSF as the basis function for the spatial and temporal discretization of the convection–diffusion equation. The TRPSF is constructed in the space–time domain, which is a combination of n–dimensional Euclidean space and time into an n + 1–dimensional manifold. Because the initial and boundary conditions were applied on the space–time domain boundaries, we converted the transient problem into an inverse boundary value problem. Additionally, all partial derivatives of the proposed TRPSF are a series of continuous functions, which are nonsingular and smooth. Solutions were approximated by solving the system of simultaneous equations formulated from the boundary, source, and internal collocation points. Numerical examples including stationary and nonstationary convection–diffusion problems were employed. The numerical solutions revealed that the proposed space–time meshless approach may achieve more accurate numerical solutions than those obtained by using the conventional radial basis function (RBF) with the time-marching scheme. Furthermore, the numerical examples indicated that the TRPSF is more stable and accurate than other RBFs for solving the convection–diffusion equation.

Keywords: space–time; transient radial basis function; convection–diffusion equation; meshless; radial polynomials

 

 

 

 

 

 

Abstract: https://www.mdpi.com/2227-7390/8/10/1735
PDF Version: https://www.mdpi.com/2227-7390/8/10/1735/pdf
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A Collocation Method Using Radial Polynomials for Solving Partial Differential Equations

Abstract: In this article, a collocation method using radial polynomials (RPs) based on the multiquadric (MQ) radial basis function (RBF) for solving partial differential equations (PDEs) is proposed. The new global RPs include only even order radial terms formulated from the binomial series using the Taylor series expansion of the MQ RBF. Similar to the MQ RBF, the RPs is infinitely smooth and differentiable. The proposed RPs may be regarded as the equivalent expression of the MQ RBF in series form in which no any extra shape parameter is required. Accordingly, the challenging task for finding the optimal shape parameter in the Kansa method is avoided. Several numerical implementations, including problems in two and three dimensions, are conducted to demonstrate the accuracy and robustness of the proposed method. The results depict that the method may find solutions with high accuracy, while the radial polynomial terms is greater than 6. Finally, our method may obtain more accurate results than the Kansa method.

Keywords: multiquadric; radial basis function; radial polynomials; the shape parameter; meshless; Kansa method

Abstract: https://www.mdpi.com/2073-8994/12/9/1419
HTML Version: https://www.mdpi.com/2073-8994/12/9/1419/htm
PDF Version: https://www.mdpi.com/2073-8994/12/9/1419/pdf
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第十二屆地下水資源及水質保護研討會

會議聯絡人資訊

召集人:    顧承宇    特聘教授     chkst26@mail.ntou.edu.tw
協同召集人:張良正    教授         lcchang@g2.nctu.edu.tw
許世孟    副教授       shihmeng@mail.ntou.edu.tw
邱永嘉    副教授       ycchiu@mail.ntou.edu.tw
執行秘書:  劉芷妤    博士         20452003@email.ntou.edu.tw
『第十二屆地下水資源及水質保護研討會』專用電郵:hre2514@email.ntou.edu.tw

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Modification of the DDA method for rigid block Problems

不連續變形分析法在落石問題之應用

https://doi.org/10.1016/S0148-9062(97)00319-7

Abstract

This paper presents the development of the rigid block version of discontinuous deformation analysis and its preliminary application in rockfall simulation. Modifications, including the reduction of the error due to large rigid body rotation by using post-correction at each time step of calculation and the incorporation of mass proportional damping to account for energy losses, are made to meet the requirement for large block translation as well as rotation. To improve the program efficiency, rigid body displacement function and preconditioned conjugate gradient solver are adopted. The results obtained show that the newly developed code, RIG-DDA, can appropriately and efficiently model various modes of rockfall movement and predict the trajectory of falling rock debris, which is helpful in the design of protection measures.



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彰濱外海離岸風機基礎設計分析

NUMERICAL ANALYSES OF PILE FOUNDATION FOR SUPPORT STRUCTURE OF OFFSHORE WIND TURBINE AT CHANGHUA COAST IN TAIWAN

This study investigates the bearing capacities of group pile foundation (jacket foundation) installed on the seabed of offshore wind farm (OWF) at the Changhua coast of Western Taiwan for the jacket support structure of offshore wind turbine (OWT) using three-dimensional (3-D) finite element method (FEM). The jacket foundations are subjected to a combined Vertical-Horizontal-Moment (V-H-M) loading for the operational period. The responses of installed group pile foundations are investigated under the combined loading in marine silty sand-low plasticity silt & clay (SM-ML-CL) layers determined by 19 offshore boring logs. The validity of numerical procedures was verified by a large-scale lateral loading test of steel tubular model pile in laboratory. A systematic parametric study was performed to investigate the effects of the pile length L, pile diameter D, and pile spacing S on the ultimate bearing (or load) capacity behavior of the foundation. The effect of pile length is significant on the vertical bearing capacity (Vult) whereas pile diameter and pile spacing on the ultimate horizontal and moment loads bearing capacities (Hult and Mult). The normalized V-H and V-H-M failure envelopes of bearing capacity for the jacket foundations subjected to combined loadings can be expressed as functions of L, D, and S and fitted by elliptical shape curves. The V-H-M failure envelopes and approximated expressions are proposed to evaluate the mechanical stability of the group pile foundations for the jacket support structure of OWT under the combined loading condition.

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https://jmst.ntou.edu.tw/marine/28-3/179-199.pdf
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Solving Backward Heat Conduction Problems Using a Novel Space–Time Radial Polynomial Basis Function Collocation Method 時空徑向多項式基底函數配點法求解反向熱傳導問題

Abstract: In this article, a novel meshless method using space–time radial polynomial basis function (SRPBF) for solving backward heat conduction problems is proposed. The SRPBF is constructed by incorporating time-dependent exponential function into the radial polynomial basis function. Di erent from the conventional radial basis function (RBF) collocation method that applies the RBF at each center point coinciding with the inner point, an innovative source collocation scheme using the sources instead of the centers is first developed for the proposed method. The randomly unstructured source, boundary, and inner points are collocated in the space–time domain, where both boundary as well as initial data may be regarded as space–time boundary conditions. The backward heat conduction problem is converted into an inverse boundary value problem such that the conventional time–marching scheme is not required. Because the SRPBF is infinitely di erentiable and the corresponding derivative is a nonsingular and smooth function, solutions can be approximated by applying the SRPBF without the shape parameter. Numerical examples including the direct and backward heat conduction problems are conducted. Results show that more accurate numerical solutions than those of the conventional methods are obtained. Additionally, it is found that the error does not propagate with time such that absent temperature on the inaccessible boundaries can be recovered with high accuracy.

 

Figure 1. Configuration of the collocation points for the direct heat conduction problem.

Figure 2. Illustration of the space–time collocation scheme: (a) The DHCP; (b) The BHCP.

Keywords: collocation method; space–time; radial polynomial; basis function; heat conduction

doi:10.3390/app10093215

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Abstract: https://www.mdpi.com/2076-3417/10/9/3215

PDF Version: https://www.mdpi.com/2076-3417/10/9/3215/pdf

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A Novel Meshfree Approach with a Radial Polynomial for Solving Nonhomogeneous Partial Differential Equations 徑向多項式基底函數配點法

In this article, a novel radial–based meshfree approach for solving nonhomogeneous partial differential equations is proposed. Stemming from the radial basis function collocation method, the novel meshfree approach is formulated by incorporating the radial polynomial as the basis function. The solution of the nonhomogeneous partial differential equation is therefore approximated by the discretization of the governing equation using the radial polynomial basis function. To avoid the singularity, the minimum order of the radial polynomial basis function must be greater than two for the second order partial differential equations. Since the radial polynomial basis function is a non–singular series function, accurate numerical solutions may be obtained by increasing the terms of the radial polynomial. In addition, the shape parameter in the radial basis function collocation method is no longer required in the proposed method. Several numerical implementations, including homogeneous and nonhomogeneous Laplace and modified Helmholtz equations, are conducted. The results illustrate that the proposed approach may obtain highly accurate solutions with the use of higher order radial polynomial terms. Finally, compared with the radial basis function collocation method, the proposed approach may produce more accurate solutions than the other.

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配點型無網格法求解非均質非線性自由液面問題

On Solving Nonlinear Moving Boundary Problems with Heterogeneity Using the Collocation Meshless Method

Abstract: In this article, a solution to nonlinear moving boundary problems in heterogeneous geological media using the meshless method is proposed. The free surface flow is a moving boundary problem governed by Laplace equation but has nonlinear boundary conditions. We adopt the collocation Treff tz method (CTM) to approximate the solution using Treff tz base functions, satisfying the Laplace equation. An iterative scheme in conjunction with the CTM for finding the phreatic line with over–specified nonlinear moving boundary conditions is developed. To deal with flow in the layered heterogeneous soil, the domain decomposition method is used so that the hydraulic conductivity in each subdomain can be diff erent. The method proposed in this study is verified by several numerical examples. The results indicate the advantages of the collocation meshless method such as high accuracy and that only the surface of the problem domain needs to be discretized. Moreover, it is advantageous for solving nonlinear moving boundary problems with heterogeneity with extreme contrasts in the permeability coefficient.
Keywords: free surface; nonlinear; heterogeneity; the collocation Treff tz method; nonlinear boundary condition

doi:10.3390/w11040835

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基本解法結合疊代法求解三維自由液面非線性問題

The Method of Fundamental Solutions for Three-Dimensional Nonlinear Free Surface Flows Using the Iterative Scheme

Abstract: In this article, we present a meshless method based on the method of fundamental solutions (MFS) capable of solving free surface flow in three dimensions. Since the basis function of the MFS satisfies the governing equation, the advantage of the MFS is that only the problem boundary
needs to be placed in the collocation points. For solving the three-dimensional free surface with nonlinear boundary conditions, the relaxation method in conjunction with the MFS is used, in which
the three-dimensional free surface is iterated as a movable boundary until the nonlinear boundary conditions are satisfied. The proposed method is verified and application examples are conducted. Comparing results with those from other methods shows that the method is robust and provides high accuracy and reliability. The effectiveness and ease of use for solving nonlinear free surface flows in three dimensions are also revealed.

Keywords: three–dimensional; tree surface; nonlinear; the method of fundamental solutions (MFS); meshless method

檔案歡迎下載

doi:10.3390/app9081715


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混合邊界型無網格法求解層狀材料之熱傳導問題 (A Novel Hybrid Boundary-Type Meshless Method for Solving Heat Conduction Problems in Layered Materials)

Abstract

In this article, we propose a novel meshless method for solving two-dimensional stationary heat conduction problems in layered materials. The proposed method is a recently developed boundary-type meshless method which combines the collocation scheme from the method of fundamental solutions (MFS) with the collocation Trefftz method (CTM) to improve the applicability of the method for solving boundary value problems. Particular non-singular basis functions from cylindrical harmonics are adopted in which the numerical approximation is based on the superposition principle using the non-singular basis functions expressed in terms of many source
points. For the modeling of multi-layer composite materials, we adopted the domain decomposition method (DDM), which splits the domain into smaller subdomains. The continuity of the flux and the temperature has to be satisfied at the interface of subdomains for the problem. The validity of
the proposed method is investigated for several test problems. Numerical applications were also carried out. Comparison of the proposed method with other meshless methods showed that it is highly accurate and computationally efficient for modeling heat conduction problems, especially in heterogeneous multi-layer composite materials.
Keywords: heat conduction problems; the collocation scheme; the meshless method; the domain decomposition method; layered materials.

檔案歡迎下載

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