Numerical Investigation of the Influences of Fishing Net on Waves

2015 ◽  
Author(s):  
Yunpeng Zhao ◽  
Chunwei Bi ◽  
Guohai Dong ◽  
Changping Chen ◽  
Yucheng Li
Keyword(s):  
Porous Media ◽  
Wave Propagation ◽  
Numerical Model ◽  
Least Squares Method ◽  
Numerical Results ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Physical Model Tests ◽  
Porous Media Model ◽  
Volume Method

A two-dimensional numerical wave flume is established based on the finite-volume method. The movement border method is adopted as a wave generator at one end of the flume. The volume of fluid (VOF) method is used to track the wave surface. In the numerical simulation, the plane net is simplified as porous-media model. The coefficients of the porous media are determined by the least squares method. In this way, the porous-media model will has the same pressure drop with the fishing net. To validate the numerical model, the numerical results are compared with the data obtained from corresponding physical model tests. It is found that the numerical results are in good agreement with the corresponding experimental data. Using the proposed numerical model, wave propagation through a plane net with different net solidities, different attack angles as well as two nets with different spacing distances are investigated. The impacts of the wave height and wavelength on the wave propagation through the plane net are also discussed.

Study on the Effect of Porosity on the Reflection Coefficient and Wave Pressure on the Partially Perforated Plates

2013 ◽  
Vol 680 ◽  
pp. 177-182
Author(s):  
Xue Feng Chen ◽  
Mei Zhang
Keyword(s):  
Reflection Coefficient ◽  
Pressure Difference ◽  
Mutual Influence ◽  
Perforated Plate ◽  
Numerical Results ◽  
Internal Source ◽  
Perforated Plates ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Sponge Layer

2D numerical wave flume is established based on the VOF method and k- model to numerically simulate the interaction of wave with perforated plates. The internal source generation of wave is applied in making wave area whose end is placed the sponge layer to absorb the reflection of wave. The numerical results of reflection coefficient before perforated plate are compared with the experimental results of reference (Liu, 2008) to verify the numerical method. By changing porosity, the effect of porosity on reflection coefficient can be analyzed. Moreover, the pressure difference between the outer and inner of perforated plate was studied, and then the mutual influence of porosity on the pressure difference is obtained according to the substantive numerical results.

Porous Media Modeling with Integrated Approach and Application in Water Flow Simulation

2010 ◽  
Vol 34-35 ◽  
pp. 717-721 ◽  
Author(s):  
Yue Liang ◽  
Liang Chen ◽  
Xiao Lu Yan
Keyword(s):  
Porous Media ◽  
Contaminant Transport ◽  
Flow Simulation ◽  
Integrated Approach ◽  
Mechanical Analysis ◽  
Porous Media Model ◽  
Model Size ◽  
Volume Method ◽  
Machinery Manufacturing ◽  
Computing Simulation

The porous media for liquid transporting and mechanical analysis, which are the hotspot studies in contaminant transport and machinery manufacturing, is hard to model in the computing simulation for the complexity of the media’s porosity. In the paper, an integrated approach is proposed to model the porous media with the framework of but not limited to sphere particles. Firstly, a series of particles are generated according to the grading curve in a closed box with the PFC3D, and then let the particles deposit freely for the gravity. After that the position and radium of each particle are exported to a file for import of AUTOCAD, where the particles are re-generated by the VBA script and the model for particles is constructed. The needed model is the porosity among the particles, so the model size is determined by a block and the model is gotten with the Boolean Operation which subtracts the particles from the block. And then with the different boundaries, the water transporting simulation in the porous media model is carried out with the Finite Volume Method (FVM). The results are proved reasonable by the previous studies.

A Two-Dimensional Numerical Wave Flume—Part 1: Nonlinear Wave Generation, Propagation, and Absorption

2001 ◽  
Vol 123 (2) ◽  
pp. 70-75 ◽  
Author(s):  
S. F. Baudic ◽  
A. N. Williams ◽  
A. Kareem
Keyword(s):  
Numerical Model ◽  
Fluid Motion ◽  
Radiation Condition ◽  
Wave Theory ◽  
Published Data ◽  
Computational Domain ◽  
Two Dimensional ◽  
Time Step ◽  
Numerical Wave Flume ◽  
Wave Flume

A numerical model is developed to simulate fully nonlinear transient waves in a semi-infinite, two-dimensional wave tank. A mixed Eulerian-Lagrangian formulation is adopted and a high-order boundary element method is used to solve for the fluid motion at each time step. Input wave characteristics are specified at the upstream boundary of the computational domain using an appropriate wave theory. At the downstream boundary, a damping region is used in conjunction with a radiation condition to prevent wave reflections back into the computational domain. The convergence characteristics of the numerical model are studied and the numerical results are validated through a comparison with previous published data.

Numerical Model of Wave Flume

2011 ◽  
Vol 138-139 ◽  
pp. 79-84
Author(s):  
Ya Mei Lan ◽  
Yong Guo Li ◽  
Wen Hua Guo
Keyword(s):  
Stokes Equations ◽  
Navier Stokes ◽  
Volume Of Fluid Method ◽  
Governing Equations ◽  
Navier Stokes Equations ◽  
Reflected Waves ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Computation Efficiency ◽  
Volume Method

Based on the finite volume method, the Navier-Stokes equations was used as the governing equations to develop a new module of the wave generating and absorbing function. The wave generating was introduced as the man-made source terms into the momentum equations, which was suitable for the volume of fluid method (VOF). Within the numerical wave flume, the reflected waves from the construction could be absorbed effectively. The absorbing section arranged at the end of the wave flume was for absorbing the incident wave, which allows for random and effective working time within the reletively smaller computation domain. Consequently, the computation efficiency was greatly improved. Finally, the validity of the absorbing section arranged at the front and end of the wave flume was investigated individually.

Tests and Applications of a Numerical Model for Nonlinear Wave Propagation on Non-Uniform Current

2010 ◽  
Author(s):  
Hong-sheng Zhang ◽  
Wei-yuan Wang ◽  
Wen-jing Feng ◽  
Jian-min Yang ◽  
Shi-qiang Lu
Keyword(s):  
Wave Propagation ◽  
Numerical Model ◽  
Laboratory Data ◽  
Wave Model ◽  
Nonlinear Wave Propagation ◽  
Wave Flume ◽  
Breaking Mechanism ◽  
Uniform Current ◽  
Fourth Order Model ◽  
Boussinesq Models

A Boussinesq-type wave model is used to investigate the interaction of waves with a non-uniform current field. The numerical model is first tested for wave propagation in a wave flume of uniform depth without current. It is then tested in a wave flume for a submerged bar. The validated numerical model is of higher accuracy than the fully-nonlinear fourth-order model, which is one of the best forms among the existing conventional Boussinesq models that do not incorporate breaking mechanism in one dimension. Comparison of model results with laboratory data shows the model is capable of representing wave-current interactions. The effect of current on wave is studied for different incident wave conditions, and the wave blocking is simulated successfully.

Development of a projection-based SPH method for numerical wave flume with porous media of variable porosity

2018 ◽  
Vol 140 ◽  
pp. 1-22 ◽  
Author(s):  
Abbas Khayyer ◽  
Hitoshi Gotoh ◽  
Yuma Shimizu ◽  
Kohji Gotoh ◽  
Hosein Falahaty ◽  
...  
Keyword(s):  
Porous Media ◽  
Sph Method ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Variable Porosity ◽  
Numerical Wave
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