Unsteady Reynolds Averaged Navier–Stokes Method for Free-Surface Wave Flows around Surface-Piercing Cylindrical Structures

2009 ◽  
Vol 135 (4) ◽  
pp. 135-143 ◽  
Author(s):  
Shin Hyung Rhee
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Navier Stokes ◽  
Cylindrical Structures ◽  
Free Surface Wave ◽  
Reynolds Averaged Navier Stokes ◽  
Wave Flows

Validation Study for Free-Surface Wave Flows Around Surface-Piercing Cylindrical Structures

2005 ◽  
Author(s):  
Shin Hyung Rhee ◽  
Boris Makarov
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Breaking Waves ◽  
Navier Stokes ◽  
Test Cases ◽  
Ship Waves ◽  
Cylindrical Structures ◽  
Free Surface Waves ◽  
Free Surface Wave ◽  
Wave Flows

The present study is concerned with the free-surface wave flows around surface-piercing cylindrical structures. The volume of fluid method implemented in a Navier-Stokes computational fluid dynamics code is employed for test cases that involve general ship waves, spilling breaking waves, bubbly free-surface in separated regions, and interaction between free-surface waves and underlying viscous flow. The computational results are validated against existing experimental data, showing good agreement. The validation results suggest that the present computational approach provides a tool that is flexible and accurate enough to capture the outstanding flow physics associated with the free-surface wave flows around surface-piercing cylindrical structures.

Free-Surface Wave-Induced Separation

1996 ◽  
Vol 118 (3) ◽  
pp. 546-554 ◽  
Author(s):  
Z. J. Zhang ◽  
F. Stern
Keyword(s):  
Fluid Dynamics ◽  
Free Surface ◽  
Surface Wave ◽  
Navier Stokes ◽  
Surface Boundary ◽  
Flow Conditions ◽  
Continuity Equations ◽  
Surface Boundary Conditions ◽  
Free Surface Wave ◽  
Wave Induced

Free-surface wave-induced separation is studied for a surface-piercing NACA 0024 foil over a range of Froude numbers (0, .2, .37, .55) through computational fluid dynamics of the unsteady Reynolds-averaged Navier-Stokes and the continuity equations with the Baldwin-Lomax turbulence model, exact nonlinear kinematic and approximate dynamic free-surface boundary conditions, and a body/free-surface conforming grid. The flow conditions and uncertainty analysis are discussed. A topological rule for a surface-piercing body is derived and verified. Steady-flow results are presented and analyzed with regard to the wave and viscous flow and the nature of the separation.

Unsteady Reynolds-averaged Navier–Stokes investigation of free surface wave impact on tidal turbine wake

2021 ◽  
Vol 477 (2246) ◽  
pp. 20200703
Author(s):  
Zhisong Li ◽  
Kirti Ghia ◽  
Ye Li ◽  
Zhun Fan ◽  
Lian Shen
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Surface Waves ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Wave Impact ◽  
Power Extraction ◽  
Tidal Turbine ◽  
Turbine Wake

Tidal current is a promising renewable energy source. Previous studies have investigated the influence of surface waves on tidal turbines in many aspects. However, the turbine wake development in a surface wave environment, which is crucial for power extraction in a turbine array, remains elusive. In this study, we focus on the wake evolution behind a single turbine and its interaction with surface waves. A numerical solver is developed to study the effects of surface waves on an industrial-size turbine. A case without surface wave and two cases with waves and different rotor depths are investigated. We obtain three-dimensional flow field descriptions near the free surface, around the rotor, and in the near- and far-wake. In a comparative analysis, the time-averaged and instantaneous flow fields are examined for various flow characteristics, including momentum restoration, power output, free surface elevation and vorticity dynamics. A model reduction technique is employed to identify the coherent flow structures and investigate the spatial and temporal characteristics of the wave–wake interactions. The results indicate the effect of surface waves in augmenting wake restoration and reveal the interactions between the surface waves and the wake structure, through a series of dynamic processes and the Kelvin–Helmholtz instability.

Characteristics of free-surface wave on high-speed liquid lithium jet for IFMIF

2011 ◽  
Vol 417 (1-3) ◽  
pp. 1303-1306 ◽  
Author(s):  
Takuji Kanemura ◽  
Sachiko Yoshihashi-Suzuki ◽  
Hiroo Kondo ◽  
Hirokazu Sugiura ◽  
Nobuo Yamaoka ◽  
...  
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
High Speed ◽  
Liquid Lithium ◽  
Free Surface Wave

Experimental and numerical study of free-surface wave resonance in the gap between two elongated parallel boxes with square corners

2020 ◽  
Vol 104 ◽  
pp. 102376
Author(s):  
Hongchao Wang ◽  
Wenhua Zhao ◽  
S. Draper ◽  
H.A. Wolgamot ◽  
P.H. Taylor
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Numerical Study ◽  
Wave Resonance ◽  
Free Surface Wave
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