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Số người truy cập: 106,996,831

 Finite volume method for prediction of wave impact loadings on vertical breakwaters and seawalls
Tác giả hoặc Nhóm tác giả: Hoang Nam Phan, Van Lac Le
Nơi đăng: The 2011 World Congress on Advances in Structural Engineering and Mechanics (ASEM11plus); Số: SM106_797;Từ->đến trang: 4574-4587;Năm: 2011
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Recently, theoretical and experimental studies show the necessity of dynamic analysis, including water impact loading of the free surface flows in design and safety assessment of structures. Therefore, development of reliable analysis tools which can precisely predict the wave impact pressure load acting on the vertical structures is crucial. The numerical models developed for prediction of water impact pressure are mainly based on Navier-Stokes equations, which describe the motion of fluid flows. Most solution methods for the unsteady incompressible Navier-Stokes equations use the fixed grid approach and they should be coupled with mathematical treatment of the free surface. In this paper, the wave impact pressure acting on a vertical wall resulting from a dam-breaking problem is simulated using Navier-Stokes (N-S) solver. The N-S solver uses an Eulerian Finite Volume Method (FVM) along with Volume Of Fluid (VOF) method for 2-D incompressible free surface flows. A Split Lagrangian Advection (SLA) scheme for VOF method is implemented in this paper to describe the propagation of interface by the flow in the context of the finite volume method. The SLA scheme is developed based on an algorithm of Piecewise Linear Interface Calculation (PLIC). The whole computational domain is subdivided into a finite number of non overlapping control volumes based on a staggered grid system. The coupling between the continuity and momentum equations is affected by using a well-known Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm. Several two-dimensional numerical simulations of the dam-breaking problem with and without obstacle are presented to validate the accuracy and demonstrate the capability of the present algorithm. The significance of the time step and the grid resolution are also discussed in this paper. The computational results are compared with experimental data and with computations by other numerical methods. The results showed a favorable agreement of wave impact pressure as well as the global fluid motion. It can be concluded that the present algorithm is robust and efficient to be used for computation of wave impact pressure acting on the vertical wall of breakwater and similar structures.
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