Fang Kezhao
Professor Supervisor of Doctorate Candidates Supervisor of Master's Candidates
Gender:Male
Alma Mater:Dalian University of Technology
Degree:Doctoral Degree
School/Department:Dalian University of Technology
Discipline:Port, Coastal and Offshore Engineering
Business Address:Room B304, Ocean Engineering Research Institute
E-Mail:kfang@dlut.edu.cn
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Indexed by:期刊论文
Date of Publication:2018-03-09
Journal:JOURNAL OF FLUID MECHANICS
Included Journals:SCIE、EI
Volume:842
Issue:842
Page Number:323-353
ISSN No.:0022-1120
Key Words:surface gravity waves; waves/free-surface flows; wave-structure interactions
Abstract:A new multi-layer irrotational Boussinesq-type model is proposed for both linear and nonlinear surface water waves over mildly sloping seabeds. The model is formulated in terms of computational horizontal and vertical velocity components within each layer and satisfies exact kinematic and dynamic free-surface conditions as well as kinematic seabed conditions. Using a Stokes-type expansion, a theoretical analysis of the new multi-layer model is carried out to examine both linear and nonlinear properties, including wave celerity, velocity profiles, shoaling amplitude, second- and third-order transfer functions and amplitude dispersion. The dispersive coefficients in the governing equations are determined by optimizing the linear celerity or linear velocity profiles. For example, the four-layer model shows extremely high accuracy and is applicable up to kh D 667-800 (where k is the wavenumber and h is a typical water depth) with a 1% error in wave phase celerity, and up to kh D 352-423 with a 1% error in the linear velocity components. The super- and subharmonic transfer functions are extremely accurate up to kh D 300 (1% error), the third-order harmonics and amplitude dispersion are accurate up to kh D 477 (1% error), and the shoaling property is optimized to cover the range of 0 < kh < 300, which presents a 0.06% tolerance error in shoaling amplitude. The high-accuracy nature of the model increases its suitability for simulating random wave propagation from extremely deep to shallow waters over mildly sloping topographies. The model is implemented numerically on a non-staggered grid via a composite fourth-order Adams-Bashforth-Moulton time integration. The numerical results show good agreement with both the analytical solutions and experimental data.
Dr. Kezhao Fang is an associated professor (Phd Supervisor) with the State Key Laboratory of Coastal and Offshore Engineering in Dalian University of Technology. His research interests include (but not limitted to) developing numerical models for ocean and coastal waves, coastal (reef) hydrodynamics, coastal morphology. He is a member of IAHR and an invited reviewer for Journal of Fluid Mechanics, Coastal Engineering, Ocean Engineering, Applied Ocean Research, and etc. He has got a total of more than 80 papers published, the details of the papers also could be found via researchgate:
https://www.researchgate.net/profile/Kezhao_Fang2
