Effect of free surface perturbation on mean and turbulence characteristics in a smooth open channel flow

2020 ◽  
pp. 53-59
Author(s):  
S. Das ◽  
R. Balachandar ◽  
R. Barron ◽  
V. Roussinova
Keyword(s):  
Free Surface ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Turbulence Characteristics ◽  
Surface Perturbation

Interaction of surface waves with turbulence: direct numerical simulations of turbulent open-channel flow

1995 ◽  
Vol 286 ◽  
pp. 1-23 ◽  
Author(s):  
Vadim Borue ◽  
Steven A. Orszag ◽  
Ilya Staroselsky
Keyword(s):  
Free Surface ◽  
Numerical Simulations ◽  
Channel Flow ◽  
Gravity Waves ◽  
Open Channel ◽  
Open Channel Flow ◽  
Surface Region ◽  
Direct Numerical Simulations ◽  
Turbulence Production ◽  
Wind Sea

We report direct numerical simulations of incompressible unsteady open-channel flow. Two mechanisms of turbulence production are considered: shear at the bottom and externally imposed stress at the free surface. We concentrate upon the effects of mutual interaction of small-amplitude gravity waves with in-depth turbulence and statistical properties of the near-free-surface region. Extensions of our approach can be used to study turbulent mixing in the upper ocean and wind–sea interaction, and to provide diagnostics of bulk turbulence.

scholarly journals Turbulence characteristics of open channel flow over non-equilibrium 3-D mobile dunes

Sadhana ◽  
2016 ◽  
Vol 41 (9) ◽  
pp. 1019-1037
Author(s):  
Prashanth Reddy Hanmaiahgari ◽  
Ram Balachandar
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Turbulence Characteristics ◽  
Mobile Dunes ◽  
Non Equilibrium

scholarly journals LES OF OPEN-CHANNEL FLOW WITH FREE-SURFACE FLUCTUATION

2002 ◽  
Vol 46 ◽  
pp. 373-378 ◽  
Author(s):  
Akihiko NAKAYAMA ◽  
Satoshi YOKOJIMA
Keyword(s):  
Free Surface ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Surface Fluctuation

scholarly journals Free-surface flows with near-critical flow conditions

1996 ◽  
Vol 23 (6) ◽  
pp. 1272-1284 ◽  
Author(s):  
H. Chanson
Keyword(s):  
Free Surface ◽  
Channel Flow ◽  
Open Channel ◽  
Flow Instability ◽  
Open Channel Flow ◽  
Surface Characteristics ◽  
Free Surface Flows ◽  
Critical Flow ◽  
Flow Conditions ◽  
Weir Flow

Open channel flow situations with near-critical flow conditions are often characterized by the development of free-surface instabilities (i.e., undulations). The paper develops a review of several near-critical flow situations. Experimental results are compared with ideal-fluid flow calculations. The analysis is completed by a series of new experiments. The results indicate that, for Froude numbers slightly above unity, the free-surface characteristics are very similar. However, with increasing Froude numbers, distinctive flow patterns develop. Key words: open channel flow, critical flow conditions, free-surface undulations, flow instability, undular surge, undular broad-crested weir flow, culvert flow.

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