Dissertation > Excellent graduate degree dissertation topics show

2D Numerical Wave Tank Research

Author: SunZhe
Tutor: PangYongJie
School: Harbin Engineering University
Course: Fluid Mechanics
Keywords: Numerical Wave Tank (NWT) Boundary Element Method (BEM) fullynonlinear free surface condition wave attenuation Active Reflection Compensating (ARC)
CLC: U661.7
Type: Master's thesis
Year: 2012
Downloads: 176
Quote: 0
Read: Download Dissertation

Abstract


The simulation of wave environment by experiment or numerical method is an essential topic in thefield of Naval Architecture and Ocean Engineering. The fast development of modern computer science hasempowered the researchers to, at least partly, substitute numerical simulation for experiment study, whichis called Numerical Wave Tanks (NWT) technique. Some fundamental research has been conducted in twodimensional situation:A two dimensional NWT was developed based in Boundary Element Method (BEM) and MixedEulerian-Lagrangian (MEL) method, using MATLAB software. The wave-maker is piston-type orflap-type. The free surface is updated by an explicit2ndorder truncated Taylor expansion formula, and itsshape is approached by fitting the x and y coordinates using3rdsipline separately. In order to manipulatethe integration singularity, two corresponding techniques were adopted. Specially, A Gauss type quadraturewas employed in the calculation of singular source distribution integration, and the normal derivative oflogarithmic function was changed into the derivative of an angle to remove the singularity of dipoledistribution integration. The so-called “corner problem” which occurred at the interaction point of the freesurface and rigid boundaries was manipulated by double node method. The artificial damping zone wasused to avoid wave reflecting.In order to test the performance of the NWT, a variety of waves were simulated, including2ndorderStokes waves, irregular wave (P-M spectrum), solitary wave, transient overtopping wave and transientfocus wave. The numerical results show that this NWT can work steadily for quite a long time even whenthe wave-maker moves rapidly, high-frequency or sharply. And the numerical results also mach thecorresponding analytical results well in all the simulated cases. The convergence rate is good according thecalculation with different node density and time intervals.With the CFD software FLUENT, a viscous NWT was established to investigate the attenuationfeature the wave propagation. This dimension of the viscous NWT was chosen according to the physicaldimension of the general deepwater basin. Structural and dynamic mesh technique was adopted to ensurethe fluent movement of the rocker. At the end of the basin, an artificial damping zone was distributed toabsorb the incident wave.After simulating a wide range of regular wave (ω=5.5rad/s～1.8rad/s, H=0.1m~0.4m), the waveattenuation character can be represented by logarithmic function. And the corresponding coefficients werealso obtained.The Active Reflection Compensating (ARC) Technique was investigated by this viscous NWT. Thesystem transformation function was obtained by using the so-called “frequency domain” method. Thenumerical simulation indicate that this function works well i.e. the re-reflecting wave was absorbedeffectively.

Related Dissertations

  1. The Structural-acoustic Radiation Analysis and Optimization of the Small Water Plane Area Twin Hull Ship,U674.951
  2. The Structural-acoustic Radiation Analysis and Optimization of the Small Water Plane Area Twin Hull Ship,TB533.2
  3. Design and Research on the Resisting Noise Analysis of the Urban Rail Noise Controller,TB535
  4. Research of Electric Field Analysis on Simplified Model Electric Equipment,TM501
  5. A High-pressure Pump Motor Noise Control Scheme,TB535
  6. Experimental Study on Pile-restrained Pontoon-plates Floating Breakwater,U656.2
  7. Research on Signal Transmission Method & Characteristics of Human Body Communication,R318.6
  8. Field Measurement and Simulation of Wave Attenuation Effects in Mangroves,S718.5
  9. A Study on the Numerical Simulation of High-Speed Vehicle’s External Aerodynamic Acoustic Field,U270.16
  10. The Optimization Design of Structural Acoustic Performance Based on Mode Shapes and Response Surface Method,TB532
  11. Research and performance of composite materials based on graphite by interference,TB33
  12. The Research on Properties and Motions of Mud in Estuary,TV148
  13. Wave Attenuation on Fluid Mud and Its Numerical Simulation,P731.22
  14. Dynamics Research on Strong Shock Gestation in Sichuan-Yunnan and Its Adjacent Areas,P315
  15. Dynamic Analysis and Noise Prediction of the Large-Scale Compressor,TH45
  16. Study on High-Resolution GPR Technique Through Reducing the Influences of Absorption and Attenuation,P631.3
  17. The Shock Wave Attenuation and Anti-detonation Property of Aluminum Foam,O383
  18. Tomography for The 3-D S -Wave Quality Factor Q_B Structure of Crust and Upper Mantle in China,P631.4
  19. Research on Calculating Method of Interior Aerodynamic Noise for High-speed Automobile,TB532
  20. Studies of Thin Films Coated on Microparticles Using Magnetron Sputtering Method,TB43
  21. Dynamic Interaction between Surface Water Waves and Muddy Seabed,TV142

CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship performance test equipment
© 2012 www.DissertationTopic.Net  Mobile