scholarly journals Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

2017 ◽  
Vol 158 ◽  
pp. 157-166 ◽  
Author(s):  
J. Yan ◽  
X. Deng ◽  
A. Korobenko ◽  
Y. Bazilevs
Keyword(s):  
Free Surface ◽  
Modeling And Simulation ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Horizontal Axis ◽  
Flow Modeling ◽  
Tidal Stream

Multiphase modeling of the free surface flow through a Darrieus horizontal axis shallow-water turbine

2019 ◽  
Vol 143 ◽  
pp. 1890-1901 ◽  
Author(s):  
Alla Eddine Benchikh Le Hocine ◽  
R.W. Jay Lacey ◽  
Sébastien Poncet
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Horizontal Axis ◽  
Multiphase Modeling ◽  
Water Turbine ◽  
Flow Through

Numerical Simulations of Two Back-To-Back Horizontal Axis Tidal Stream Turbines in Free-Surface Flows

2020 ◽  
Vol 87 (6) ◽  
Author(s):  
Jinhui Yan ◽  
Xiaowei Deng ◽  
Fei Xu ◽  
Songzhe Xu ◽  
Qiming Zhu
Keyword(s):  
Free Surface ◽  
Surface Effect ◽  
Mathematical Formulation ◽  
Time History ◽  
Free Surface Flow ◽  
Free Surface Flows ◽  
Surface Flow ◽  
Wake Effect ◽  
Tidal Turbine ◽  
Tidal Stream

Abstract We simulate two back-to-back full-scale tidal turbines using an in-house computational free-surface flow code. We briefly present the mathematical formulation of the computational framework. We first validate the proposed method on a single turbine configuration. A mesh refinement study is conducted to ensure the result is converged. We then quantify the wake effect and free-surface effect on tidal turbine performance by a case study. To investigate the free-surface effect, we perform both pure hydrodynamics and free-surface simulations. The time history of thrust and production coefficients is quantified. In both pure hydrodynamics and free-surface flow simulations, thrust and production coefficients of the downstream turbines drop significantly due to the velocity deficit in the wake. By comparing the result between free-surface flow and pure hydrodynamics simulations for the configuration considered here, we find that the free-surface does not affect the upstream turbine but significantly affects the downstream turbine.

scholarly journals Wetting and free surface flow modeling for potting and encapsulation.

2007 ◽  
Author(s):  
Carlton, F. Brooks ◽  
Michael J. Brooks ◽  
Alan Lyman Graham ◽  
David F. Noble ◽  
)) ◽  
...  
Keyword(s):  
Free Surface ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Flow Modeling

Antral recirculation in the stomach during gastric mixing

2013 ◽  
Vol 304 (5) ◽  
pp. G536-G542 ◽  
Author(s):  
Yohsuke Imai ◽  
Ikuma Kobayashi ◽  
Shunichi Ishida ◽  
Takuji Ishikawa ◽  
Martin Buist ◽  
...  
Keyword(s):  
Free Surface ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Flow Modeling ◽  
Distal Stomach ◽  
Initial Location ◽  
Greater Curvature ◽  
Twisted Shape ◽  
Peristaltic Contractions ◽  
Realistic Geometry

We investigate flow in the stomach during gastric mixing using a numerical simulation with an anatomically realistic geometry and free-surface flow modeling. Because of momentum differences between greater and lesser curvatures during peristaltic contractions, time-averaged recirculation is generated in the antrum, with retropulsive flow away from the pylorus and compensation flow along the greater curvature toward the pylorus. Gastric content in the distal stomach is continuously transported to the distal antrum by the forward flow of antral recirculation, and it is then mixed by the backward retropulsive flow. Hence, the content inside the antral recirculation is well mixed independently of initial location, whereas the content outside the recirculation is poorly mixed. Free-surface modeling enables us to analyze the effects of posture on gastric mixing. In the upright, prone, and right lateral positions, most of the antrum is filled with content, and the content is well mixed by antral recirculation. In contrast, in the supine and left lateral positions, most of the content is located outside antral recirculation, which results in poor mixing. The curved, twisted shape of the stomach substantially supports gastric mixing in fluid mechanical terms.

scholarly journals Laminar free-surface flow into a vertical cylinder

1975 ◽  
Vol 3 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Thomas G. Smith ◽  
J.O. Wilkes
Keyword(s):  
Free Surface ◽  
Vertical Cylinder ◽  
Free Surface Flow ◽  
Surface Flow

Free-Surface Flow Simulations With Interactively Moving Bodies

2017 ◽  
Author(s):  
Arthur E. P. Veldman ◽  
Henk Seubers ◽  
Peter van der Plas ◽  
Joop Helder
Keyword(s):  
Free Surface ◽  
Free Fall ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Numerical Solution Method ◽  
Flow Simulations ◽  
Floating Object ◽  
Offshore Industry ◽  
Floating Objects ◽  
Moving Bodies

The simulation of free-surface flow around moored or floating objects faces a series of challenges, concerning the flow modelling and the numerical solution method. One of the challenges is the simulation of objects whose dynamics is determined by a two-way interaction with the incoming waves. The ‘traditional’ way of numerically coupling the flow dynamics with the dynamics of a floating object becomes unstable (or requires severe underrelaxation) when the added mass is larger than the mass of the object. To deal with this two-way interaction, a more simultaneous type of numerical coupling is being developed. The paper will focus on this issue. To demonstrate the quasi-simultaneous method, a number of simulation results for engineering applications from the offshore industry will be presented, such as the motion of a moored TLP platform in extreme waves, and a free-fall life boat dropping into wavy water.

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