Numerical study of breaking waves by a two-phase flow model

2011 ◽  
pp. n/a-n/a
Author(s):  
Zhihua Xie
Keyword(s):  
Flow Model ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Breaking Waves ◽  
Phase Flow ◽  
Two Phase

scholarly journals Numerical simulation of breaking waves using a two-phase flow model

2004 ◽  
Vol 28 (11) ◽  
pp. 983-1005 ◽  
Author(s):  
Phung Dang Hieu ◽  
Tanimoto Katsutoshi ◽  
Vu Thanh Ca
Keyword(s):  
Numerical Simulation ◽  
Flow Model ◽  
Two Phase Flow ◽  
Breaking Waves ◽  
Phase Flow ◽  
Two Phase

scholarly journals A Numerical Study on Oscillatory Flow-Induced Sediment Motion over Vortex Ripples

2015 ◽  
Vol 45 (1) ◽  
pp. 228-246 ◽  
Author(s):  
Xin Chen ◽  
Xiping Yu
Keyword(s):  
Turbulence Model ◽  
Oscillatory Flow ◽  
Flow Model ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Laboratory Data ◽  
Phase Flow ◽  
Mass Force ◽  
Two Phase ◽  
Reference Concentration

AbstractA two-dimensional, two-phase flow model is applied to the study of sediment motion over vortex ripples under oscillatory flow conditions. The Reynolds-averaged continuity equations and momentum equations for both the fluid and sediment phases, which include the drag force, the added mass force, the lift force for interphase coupling, and the standard k–ε turbulence model as well as the Henze–Tchen particle turbulence model for closure, are numerically solved with a finite-volume method. The model is effective over the whole depth from the undisturbed sandy bed to the low concentration region above the ripples. Neither a reference concentration nor a pickup function is required over the ripple bed as in a conventional advection–diffusion model. There is also no need to identify the bed load and the suspended load. The study focuses on the effects of erodible ripples on the intrawave flow and sediment motion over the ripples. The computational results show reasonable agreement with the available laboratory data. It is demonstrated that the formation–ejection process of vortices and the trapping–lifting process of sediment over vortex ripples can be well described by the two-phase flow model. The numerical model can also accurately predict the vertical distribution of the mean sediment concentration.

scholarly journals A two-phase flow model for three-dimensional breaking waves over complex topography

2015 ◽  
Vol 471 (2180) ◽  
pp. 20150101 ◽  
Author(s):  
Zhihua Xie
Keyword(s):  
Wave Breaking ◽  
Flow Model ◽  
Two Phase Flow ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Air Entrainment ◽  
Breaking Waves ◽  
Phase Flow ◽  
Complex Topography ◽  
Two Phase

A two-phase flow model has been developed to study three-dimensional breaking waves over complex topography, including the wave pre-breaking, overturning and post-breaking processes. The large-eddy simulation approach has been adopted in this study, where the model is based on the filtered Navier–Stokes equations with the Smagorinsky sub-grid model being used for the unresolved scales of turbulence. The governing equations have been discretized using the finite volume method, with the PISO algorithm being employed for the pressure–velocity coupling. The air–water interface has been captured using a volume of fluid method and the partial cell treatment has been implemented to deal with complex topography in the Cartesian grid. The model is first validated against available analytical solutions and experimental data for solitary wave propagation over constant water depth and three-dimensional breaking waves over a plane slope, respectively. Furthermore, the model is used to study three-dimensional overturning waves over three different bed topographies, with three-dimensional wave profiles and surface velocities being presented and discussed. The overturning jet, air entrainment and splash-up during wave breaking have been captured by the two-phase flow model, which demonstrates the capability of the model to simulate free surface flow and wave breaking problems over complex topography.

A ONE-DIMENSIONAL TWO-PHASE FLOW MODEL AND EXPERIMENTAL VALIDATION FOR A FLASHING VISCOUS LIQUID IN A SPLASH PLATE NOZZLE

2015 ◽  
Vol 25 (9) ◽  
pp. 795-817 ◽  
Author(s):  
Mika P. Jarvinen ◽  
A. E. P. Kankkunen ◽  
R. Virtanen ◽  
P. H. Miikkulainen ◽  
V. P. Heikkila
Keyword(s):  
Viscous Liquid ◽  
Experimental Validation ◽  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional
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