Calculation of Regular Longitudinal Wave Force in MMG Model Based on CFD

2013 ◽  
Vol 423-426 ◽  
pp. 1727-1731
Author(s):  
Lin Jia Yang ◽  
Yi Han Tao
Keyword(s):  
Mathematical Model ◽  
Longitudinal Wave ◽  
3D Model ◽  
Wave Force ◽  
Ship Motion ◽  
Hexahedral Mesh ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Mmg Model ◽  
Cfd Method

Wave force is one of the most important environmental disturbing forces in ship motion mathematical model. Calculating the wave force in ship mathematical model is of a great importance about prediction of ships maneuverability. In order to calculate the longitudinal wave force in MMG ship motion mathematical model, the CFD method was used in this work to build numerical wave flume. The 3D model of M/V YUKUN and hexahedral mesh of the domain of the flow field were made. Software Fluent was used to simulate the motion of YUKUN in regular longitudinal waves, and the wave force acting on YUKUN was obtained. Finally, regression formula was built based on the simulation results.

Numerical Simulation on Wave Force Acting on the Hollow Blocks

2013 ◽  
Vol 702 ◽  
pp. 37-43
Author(s):  
Xue Feng Chen ◽  
Kang Yang ◽  
Yu Cheng Li
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mathematical Model ◽  
Wave Force ◽  
Regular Wave ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Pressure Fields ◽  
Hollow Block ◽  
Numerical Wave

In order to study the wave force acting on the hollow blocks structures locating at the permeable foundation under the regular wave flume, the wave tank is established basing on improved N-S Equations. And the moving boundary’s generating wave and wave absorption of momentum source are adopted in the numerical wave flume. It can also be simulated permeable foundation by porous media module. Then mathematical model can be constructed under the interaction between waves and hollow block when PISO is used to couple velocity and pressure fields. At the same time, the numerically calculated results of the wave force acting on the hollow blocks are compared with the experimental data in agreement. In conclusion, the variation of the wave force with incident wave height and period is obtained through the numerical calculation.

scholarly journals Estimation of Wave Force Acting on Bridge Superstructures due to the 2011 Tohoku Tsunami

2013 ◽  
Vol 8 (4) ◽  
pp. 605-611 ◽  
Author(s):  
Shojiro Kataoka ◽  
◽  
Masahiro Kaneko
Keyword(s):  
Highway Bridges ◽  
Wave Theory ◽  
Wave Force ◽  
Wave Forces ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
2011 Tohoku Tsunami ◽  
Time Histories ◽  
Numerical Wave ◽  
Tohoku Tsunami

Wave forces acting on the superstructures of two highway bridges affected by the 2011 Tohoku tsunami, the Shin-Aikawa Bridge and the Yanoura Bridge, are estimated combining 2-D FDM and a numerical wave flume (CADMAS-SURF) analysis. The superstructure of the Shin-Aikawa Bridge was washed out and swept 500 m away by the backwash. The Yanoura Bridge suffered no damage even though it was completely submerged in the tsunami. Time histories of the tsunami wave height and flow velocity are calculated using 2-D FDM, based on the nonlinear long wave theory. Lateral and uplift forces acting on the superstructures due to the simulated tsunami are then analyzed by the numerical wave flume. Comparisons between the analytical wave forces and corresponding loading capacities account for the differences in damage to the two bridges.

Mechanical Stress Analysis of Different Shapes Pillars with Cnoidal Internal Wave Action

2013 ◽  
Vol 732-733 ◽  
pp. 417-420
Author(s):  
Xiao Chao Fan ◽  
Rui Jing Shi ◽  
Feng Ting Li ◽  
Bo Wei ◽  
Yue Dang
Keyword(s):  
Internal Wave ◽  
Stress Analysis ◽  
Internal Waves ◽  
Three Dimensional ◽  
Wave Force ◽  
Viscous Force ◽  
Inertia Force ◽  
Converted Wave ◽  
Numerical Wave Flume ◽  
Wave Flume

The numerical simulations of the flow around different pillars acted by the cnoidal internal waves have been made by building numerical wave flume based on FLUENT software. The cnoidal internal wave was created by using the push-pedal method, and the free surface was tracked by using VOF (volume of fluid) method. The three-dimensional different amplitude and period cnoidal internal waves were simulated. The inertia force and viscous force trends were analyzed, and for different pillars the total wave force were compared. There were some significance for stress analysis of the offshore terminal pillars. The converted wave force could alternative and treatment problems about square columns.

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.

Modeling and Simulation of Ship Motion for Dynamic Positioning Vessel

2014 ◽  
Vol 919-921 ◽  
pp. 2127-2130
Author(s):  
Pei Wen Yu ◽  
Hui Chen
Keyword(s):  
Modeling And Simulation ◽  
Wind Wave ◽  
Ship Motion ◽  
Dynamic Positioning ◽  
Positioning System ◽  
Dynamic Positioning System ◽  
Oil Supply ◽  
Mmg Model ◽  
Simulation Results

The paper presents a method to build MMG model of ship motion for a oil supply vessel (OSV) with dynamic positioning system. It is assumed that the ship motion exposed to environment disturbances like wind, wave & currents, The simulation results show that the model of the vessel and environment disturbances are suitable, and the method is practicable .

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

Study Based on FLUENT of Broken Internal Waves in Different Slope Angles

2014 ◽  
Vol 638-640 ◽  
pp. 1769-1777
Author(s):  
Zi Tong Yan ◽  
Liang Qiu Cheng ◽  
Feng Yi ◽  
Tai Zhong Chen ◽  
Han Sun ◽  
...  
Keyword(s):  
Internal Waves ◽  
Solitary Waves ◽  
Wave Breaking ◽  
Slope Angle ◽  
Ecological Environment ◽  
Internal Solitary Waves ◽  
Propagation Process ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
New Methods

Internal waves will break in the process of communication, the broken will make water in upper and lower mixing, which has significant influence on the hydrodynamic and layered characteristics of density stratification of the water. In order to reveal the propagation of internal solitary waves, a 3d numerical wave flume was built. The research of the propagation of internal solitary waves in the regular topography and broken on slopes was based on FLUENT. Comparing the fragmentation degree of different slope angle and researching the energy dissipation of the wave propagation process , which are supposed to successfully match the results with the experiment results, can provide new methods and means for the further study of internal wave breaking characteristics and the improvement of ecological environment of water bodies.

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

Dynamic Instability Analysis of a Spring-Loaded Pressure Safety Valve Connected to a Pipe by Using CFD Method

2018 ◽  
Author(s):  
Feng Jie Zheng ◽  
Chao Yong Zong ◽  
Fu Zheng Qu ◽  
Wei Sun ◽  
Xue Guan Song
Keyword(s):  
Dynamic Instability ◽  
Safety Valve ◽  
Wave Force ◽  
Design Parameters ◽  
Instability Mechanism ◽  
Pressure Relief ◽  
Pressure System ◽  
System Pressure ◽  
And Performance ◽  
Cfd Method

As the ultimate protection of a pressure system, pressure safety valves (PSV) can respond in an instable manner such as flutter and chatter which will affect service life, reliability and performance. In order to study the dynamic instability caused by multi-source forces including the flow force, the spring compressing force and the pressure wave force, a more realistic CFD model containing a PSV and different connected pipes as well as the pressure vessel is developed, in which advanced techniques in Fluent such as User Defined Function (UDF) and Dynamic Layering method are combined to allow the PSV to operate. Based on this model, the process of the valve’s opening and reclosing is monitored to examine the influence of design parameters on the dynamic instability of the PSV. Specifically, the propagation of pressure waves along the connecting pipes is successfully captured, which is of great help to explain the instability mechanism and optimize the design and setup of pressure relief systems.

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