A Numerical Investigation of Gap and Shape Effects on a 2D Plunger-Type Wave Maker

Wave maker is one of the most important experimental equipment in marine engineering. To meet the demands of simulation of higher wave amplitude and compare the effect of piston and flap type wave generation, a new wave generation device was proposed and a new piston and flap type wave maker with a rotary-valve-control vibrator was developed. A mathematical model of the new wave maker was established and analysed by Simulink, and a series of experiments were conducted on the wave maker to analyze wave generation characteristics. The results show that the wave maker can adjust the distance of wave paddle and generate different regular waves. The bigger the axial opening size of the valve port, the larger the wave paddle amplitude and the wave amplitude; the higher the pressure, the higher the wave paddle amplitude and the wave amplitude. High frequency wave making is more efficient than the lower one, and piston type wave making is more efficient than those wave makers that generate waves by flap type.

Download Full-text

Simulation of Harmonic Waves Generated by the Piston-type Wave-maker in the Wave Flume via the Exponential Basis Functions Mesh-free Method and MEL Formulation

Journal of Computational Methods In Engineering ◽

10.29252/jcme.37.1.1 ◽

2018 ◽

Vol 37 (1) ◽

pp. 1-9

Author(s):

S. M. Zandi ◽

◽

A. Rafizadeh ◽

Keyword(s):

Basis Functions ◽

Harmonic Waves ◽

Wave Flume ◽

Type Wave ◽

Exponential Basis ◽

Mesh Free ◽

Mesh Free Method ◽

Wave Maker

Download Full-text

CFD Modeling of Regular and Irregular Waves Generated by Flap Type Wave Maker

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences ◽

10.37934/arfmts.85.2.128144 ◽

2021 ◽

Vol 85 (2) ◽

pp. 128-144

Author(s):

Ali Shehab Shams Eldeen ◽

Ahmed M. R. El-Baz ◽

Abdalla Mostafa Elmarhomy

Keyword(s):

Numerical Simulation ◽

Simulation Method ◽

Irregular Waves ◽

Cfd Modeling ◽

Linear Wave ◽

Ocean Engineering ◽

Navier Stokes Equation ◽

Type Wave ◽

Wave Maker ◽

Numerical Beach

The improvement of wave generation in numerical tanks represents the key factor in ocean engineering development to save time and effort in research concerned with wave energy conversion. For this purpose, this paper introduces a numerical simulation method to generate both regular and irregular waves using Flap-Type wave maker. A 2D numerical wave tank model is constructed with a numerical beach technique, the independence of the numerical beach slope is tested to reduce the wave reflections. The different governing parameters of the Flap type wave maker were studied such as periodic time dependency and length of the flap stroke. The linear wave generated was validated against the wave maker theory WMT, the numerical results agreed with WMT. The Pierson-Moskowitz model is used to generate irregular waves with different frequencies and amplitudes. The numerical model succeeded to generate irregular waves which was validated against published experimental data and with Pierson-Moskowitz spectrum model using Fourier expansion theory in the frequency domain. Useful results are presented in this paper based on the numerical simulation to understand the characteristics of the waves. This paper produces a full guide to generate both regular and irregular waves numerically using ANSYS-CFX approach to solve the 2D Unsteady Reynolds Averaged Navier-Stokes Equation (URANS).

Download Full-text

Numerical investigation of a microwave discharge driven by the H 10-type wave

Plasma Physics Reports ◽

10.1134/1.952878 ◽

2000 ◽

Vol 26 (5) ◽

pp. 456-461

Author(s):

N. Zh. Kairyev ◽

É. B. Kulumbaev ◽

V. M. Lelevkin

Keyword(s):

Numerical Investigation ◽

Microwave Discharge ◽

Type Wave

Download Full-text

The Generation of Internal Gravity Waves in a Multilayered Moving Fluid by a Flap-Type Wave Maker

Journal of Applied Mechanics ◽

10.1115/1.3169035 ◽

1985 ◽

Vol 52 (2) ◽

pp. 247-252

Author(s):

M. R. Mu¨ller ◽

P. C. Shang

Keyword(s):

Gravity Waves ◽

Internal Gravity Waves ◽

Low Frequencies ◽

Type Wave ◽

Wave Maker ◽

Moving Fluid

Experiments have examined the waveforms generated by a flap-type wave maker in a moving, three-layer fluid. Results show that the observed modulating waveforms could be predicted accurately for low frequencies and that if the two interfaces are sufficiently close together, both mode-one waves (whose amplitude vary in the vertical such that there is only one maximum) and mode-two waves (with a vertical amplitude structure that contains two relative maxima) are generated of similar amplitude. This results in downstream shifts from sinuous to varicose modes of oscillation.

Download Full-text

A Three-Dimensional Numerical Model with an L-Type Wave-Maker System for Water Wave Simulations by the Moving Boundary Method

Water ◽

10.3390/w12010161 ◽

2020 ◽

Vol 12 (1) ◽

pp. 161 ◽

Cited By ~ 3

Author(s):

Wei Jia ◽

Shuxue Liu ◽

Jinxuan Li ◽

Yuping Fan

Keyword(s):

Numerical Model ◽

Water Waves ◽

Moving Boundary ◽

Stokes Equations ◽

Three Dimensional ◽

Irregular Waves ◽

Wave Tank ◽

Type Wave ◽

Boundary Method ◽

Wave Maker

A three-dimensional numerical wave tank was developed based on Reynolds averaged Navier–Stokes equations and the volume of fluid method. The moving boundary method is adopted in this model to generate water waves. Piston-type wave-makers are mimicked for the total replication of the physical wave tank conditions. Two-dimensional regular and irregular waves are simulated, with the capability to trigger the active wave absorption algorithm. The two-sided wave-maker system with L-type arrangement is adopted in this model to expand the effective wave areas for three-dimensional waves. Oblique regular waves and multidirectional random waves are simulated, yielding a good agreement with theoretical solutions. The results indicate that this numerical model is an effective tool to provide finer details or complement data unavailable due to the physical setting of a tank experiment.

Download Full-text