Numerical Study of Wave Slamming on a Rectangular Slab

2012 ◽  
Vol 204-208 ◽  
pp. 4971-4977
Author(s):  
Ya Mei Lan ◽  
Wen Hua Guo ◽  
Yong Guo Li
Keyword(s):  
Numerical Study ◽  
Navier Stokes ◽  
Governing Equations ◽  
Reflected Waves ◽  
Rans Equations ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Wave Slamming ◽  
Numerical Wave ◽  
Rectangular Slab

The CFD software FLUENT was used as the foundation to develop the numerical wave flume, in which the governing equations are the Reynolds-averaged Navier-Stokes (RANS) equations and the standard k~ε turbulence model. The wave generating and absorbing were introduced into the RANS equations as the source terms using the relaxation approach. A new module of the wave generating and absorbing function, which is suitable for FLUENT based on the volume of fluid method (VOF), was established. Within the numerical wave flume, the reflected waves from the model within the computation domain can be absorbed effectively before second reflection appears due to the wave generating boundary. The computational results of the wave pressures on the bottom of the rectangular slab were validated for the different relative clearance by the experimental data. Good agreements were found.

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.

scholarly journals Numerical Modeling and Simulation of Wave Impact of a Circular Cylinder during the Submergence Process

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Xiaozhou Hu ◽  
Yiyao Jiang ◽  
Daojun Cai
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Ocean Waves ◽  
Navier Stokes ◽  
Wave Load ◽  
Wave Impact ◽  
Rans Equations ◽  
Wave Slamming ◽  
Surface Profiles ◽  
Numerical Wave

Wave slamming loads on a circular cylinder during water entry and the subsequence submergence process are predicted based on a numerical wave load model. The wave impact problems are analyzed by solving Reynolds-Averaged Navier-Stokes (RANS) equations and VOF equations. A finite volume approach (FV) is employed to implement the discretization of the RANS equations. A two-dimensional numerical wave tank is established to simulate regular ocean waves. The wave slamming problems are investigated by deploying a circular cylinder into waves with a constant vertical velocity. The present numerical method is validated using other numerical or theoretical results in accordance with varying free surface profiles when a circular cylinder sinks in calm water. A numerical example is given to show the submergence process of the circular cylinder in waves, and both free surface profiles and the pressure distributions on the cylinder of different time instants are obtained. Time histories of hydrodynamic load on the cylinder during the submergence process for different wave impact angles, wave heights, and wave periods are obtained, and results are analyzed in detail.

The Deflection Angle Impact on the Oil Containment by Boom Based on the Numerical Wave Flume

2011 ◽  
Vol 183-185 ◽  
pp. 495-499
Author(s):  
Xing Feng ◽  
Wan Qing Wu ◽  
Feng Li Zhang
Keyword(s):  
Free Surface ◽  
Turbulent Flows ◽  
Deflection Angle ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
The Deflection Angle ◽  
Numerical Wave

The 2-D numerical wave flume, based on the Reynolds Averaged Navier-Stokes equations and the standard turbulence model, was developed to simulate the turbulent flows with the free surface, in which the volume of fluid (VOF) method was used to handle the large deformation of the free surface and the relaxation approach of combined wave generation and absorbing was implemented, utilizing the commercial CFD software-FLUENT. The relationship of the wave parameters, initial failure velocity and the deflection angle was investigated.

AN APPLICATION OF NUMERICAL WAVE FLUME TO TRANSFORMATION OF BORE

2001 ◽  
Vol 17 ◽  
pp. 281-286
Author(s):  
Toshihiko Takahashi ◽  
Koji Fujima ◽  
Ryosuke Asakura ◽  
Tsuyoshi Ikeya
Keyword(s):  
Numerical Wave Flume ◽  
Wave Flume ◽  
Numerical Wave

scholarly journals INTERIM DEVELOPMENT OF A NUMERICAL WAVE FLUME FOR MARITIME STRUCTURE DESIGN

1999 ◽  
Vol 15 ◽  
pp. 321-326 ◽  
Author(s):  
M. Isobe ◽  
S. Takahashi ◽  
S. P. Yu ◽  
T. Sakakiyama ◽  
K. Fujima ◽  
...  
Keyword(s):  
Structure Design ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Numerical Wave

scholarly journals STUDY ON FUNCTION OF A L-TYPE CURTAIN WALL WAVE BARRIER USING A NUMERICAL WAVE FLUME

2000 ◽  
Vol 16 ◽  
pp. 81-86
Author(s):  
Qin JLANG ◽  
Shigeo TAKAHASHI ◽  
Masanori SHUKU ◽  
Masahiko ISOBE
Keyword(s):  
Curtain Wall ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Numerical Wave

NUMERICAL WAVE FLUME SIMULATIONS OF SEAWALL OVERTOPPING

2005 ◽  
Author(s):  
D. M. INGRAM ◽  
F. GAO ◽  
D. M. CAUSON ◽  
C. G. MINGHAM ◽  
P. TROCH
Keyword(s):  
Numerical Wave Flume ◽  
Wave Flume ◽  
Numerical Wave

scholarly journals Numerical Study on Dynamic-Stall Characteristics of Finite Wing and Rotor

2019 ◽  
Vol 9 (3) ◽  
pp. 600 ◽  
Author(s):  
Qing Wang ◽  
Qijun Zhao
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Tip Vortex ◽  
Dynamic Stall ◽  
Navier Stokes ◽  
Governing Equations ◽  
Third Order ◽  
Finite Wing ◽  
Wing Tip ◽  
Spanwise Flow

To study the three-dimensional effects on the dynamic-stall characteristics of a rotor blade, the unsteady flowfields of the finite wing and rotor were simulated under dynamic-stall conditions, respectively. Unsteady Reynolds-averaged Navier–Stokes (URANS) equations coupled with a third-order Roe–MUSCL spatial discretization scheme were chosen as the governing equations to predict the three-dimensional flowfields. It is indicated from the simulated results of a finite wing that dynamic stall would be restricted near the wing tip due to the influence of the wing-tip vortex. By comparing the simulated results of the finite wing with the spanwise flow, it is indicated that the spanwise flow would arouse vortex accumulation. Consequently, the dynamic stall is restricted near the wing root and aggravated near the wing tip. By comparing the simulated results of a rotor in forward flight, it is indicated that the dynamic stall of the rotor would be inhibited due to the effects of the spanwise flow and Coriolis force. This work fills the gap regarding the insufficient three-dimensional dynamic stall of a helicopter rotor, and could be used to guide rotor airfoil shape design in the future.

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