Numerical analysis of ventilated cavity flow over a 2-D wall mounted fence. (1st September 2017)

• Record Type: Journal Article
• Authors: Barbaca, Luka; Pearce, Bryce W.; Brandner, Paul A.
• Is Part Of: Ocean engineering. Volume 141(2017)
• Page Start: 143
• Page End: 153
• Publication Date: 2017-09-01
• Subjects: Ventilated cavity -- Wall mounted fence -- CFD; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2017.06.018
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Ventilated cavity flow over a 2-D wall mounted fence is numerically investigated using a viscous approach. An implicit unsteady compressible solver was used with a RANS k − ω SST turbulence model and VOF approach to capture the cavity interface. The simulations were carried out for a fixed fence height based Froude number and constant outlet pressure. Cavity topology, wall pressure distributions and the resulting hydrodynamic forces were determined as a function of ventilation rate, degree of fence immersion in the oncoming wall boundary layer and degree of confinement of the flow domain. It was found that with an increase in ventilation rate, lift increases and drag decreases resulting in a greater hydrodynamic efficiency (lift to drag ratio) of the fence-wall system. With increase in immersion of the fence in the boundary layer, both lift and drag decreased, while the lift to drag ratio increased. Variation in the degree of confinement had a large influence on the flow, with the reduction in lift and hydrodynamic efficiency observed for the more confined conditions. Abstract : Highlights: Ventilated cavity flow over a 2-D wall mounted fence is investigated using CFD. The cavity topology and cavity closure behaviour (re-entrant jet) are described. An increase in the ventilation rate leads to a greater hydrodynamic efficiency. The effect of the fence immersion in the oncoming boundary layer is determined. Variation in the degree of confinement had a large influence on the flow.