Wave flume

About: Wave flume is a research topic. Over the lifetime, 1627 publications have been published within this topic receiving 23335 citations.

Measurement of dissolved carbon dioxide concentration in a surf zone

Abstract: In this study, we measured dissolved carbon dioxide (D-CO2) concentration in a surf zone in a laboratory wave flume filled with freshwater and seawater using a glass electrode CO2 meter, and also observed the air-water turbulent flow field using Particle Image Velocimetry (PIV). D-CO2 concentration increased with time and the bore region reached a saturated state earlier than the transition region. The gas transfer velocity in the transition region was much higher than that in the bore region since the numerous entrained bubbles trapped within three-dimensional vortices significantly contribute to the gas dissolution into water in the transition region. The gas transfer velocity in a surf zone in freshwater were found to be higher than those in seawater. We estimated the gas transfer velocity in a surf zone from the turbulent energy in breaking waves and the Schmidt number. It was found that the gas transfer velocity could be roughly estimated from the turbulent energy in breaking waves.

Correlation between Wave Pressures and Water Surface Elevations for Irregular Waves

Abstract: This study aims to develop efficient methods for an estimation of wave pressures under irregular waves by using time series of water surface elevations. Two methods are presented in this study. One is a linear filter approximation method which is extended from an original way to calculate water particle velocities from the water surface elevations. The other one is a local approximation method which is also extended from an original way to obtain non linear water surface elevations by using time series of subsurface pressures. The validity of each method is verified comparing with experimental results for simultaneous measurements of water surface elevations and subsurface pressures under progressive and standing irregular waves in 2-D wave flume.

Numerical Simulation of Solitary Waves Using Smoothed Particle Hydrodynamics Method

Abstract: Understanding shallow water wave propagation is of major concern in any coastal mitigation effort. Many times, a solitary wave replicates a shallow water wave in its extreme sense which includes a tsunami wave. It is mainly due to known physical characteristics of such waves. Therefore, the study of propagation of solitary waves in the near shore waters is of equal importance in the context of non linear water waves. Owing to the significant growth in computational technologies in the last few decades, a significant number of numerical methods have emerged and applied to simulate nonlinear solitary wave propagation. In this study, one such method, the Smoothed Particle Hydrodynamics (SPH) method has been described to simulate the solitary waves. The split-up of a single solitary wave while it crosses a continental kind of shelf has been simulated by the present model. Then SPH model is coupled with the Boussinesq model to predict the time interval between two successive solitary waves on landfall. It has ...

The research of platform vibration characteristics based on numerical wave simulation

Abstract: Fluent and ANSYS Workbench platfrom are applicated to make a research on the time course of jack-up drilling platform under extreme wave load. Track free surface with UDF macro and VOF method. Establish numerical wave flume with the function of wave generation and wave absorbing to simulate limit value linear wave and third order Stokes wave. Flow field physical model of jackup drilling platfrom and trussed legs are established to study the time course of wave load under wave impact. Analyze wave pressure and speed distribution of the field around trussed legs and platform and calculate the stress distribution of platform structure under wave load. The calculating results of wave load will provide a basis for evaluating the influence of wave load to drilling platfrom and designing drilling platfrom rationally.

Breaking Solitary Wave Impact on a Vertical Seawall

Abstract: Wave interactions with vertical and sloping seawalls are indeed complicated, especially for the impacts due to breaking waves, which are unsteady, turbulent and multi-phase. Available studies successfully measured the impact pressure due to waves acting on seawalls, whereas the associated flow velocity and turbulence characteristic received limited attention, indicating that the momentum of such violent free-surface flows cannot be determined. In this study, new experiments were carried out in a laboratory-scale wave flume using a non-intrusive image-based measuring technique (bubble image velocimetry, BIV) to measure the flow velocities due to a shoaling solitary wave impinging on and overtopping a vertical seawall. By varying the wave height of solitary waves, the breaking point of a shoaling wave can be changed. As such, the impact point of a breaking wave in relation to the seawall can be thereby adjusted. Considering the same still-water depth, two wave height conditions are studied so as to produce different levels of aerated flows. Effects of high- and low-aerated cases on free surface elevations, flow velocities and turbulence characteristics are presented so as to develop a better understanding of wave-structure interactions. More specifically, the maximum velocities and turbulence intensities at different evolutionary phases are identified for these two cases.