Coanda effect in coastal flows

Lalli, F.; Bruschi, Antonello; Lama, Rodolfo; Liberti, Luca; Mandrone, Stefania; Pesarino, Valeria

doi:10.1016/j.coastaleng.2009.10.015

Cited by 19 publications

(7 citation statements)

References 17 publications

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“…The jet current is deflected toward the island where it spawns the strong eddy. The entire pattern of generation reminds of flow condition which is known as Coanda jet effect (Lalli et al, 2010), i.e. the tendency of a fluid jet to be attracted to a nearby surface.…”

Section: Discussionmentioning

confidence: 99%

Tidal currents in the western Svalbard Fjords

Kowalik

Marchenko²,

Brazhnikov

et al. 2015

Oceanologia

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The paper is focusing on the tides and on the strong tidal current generated in the western fjords of Svalbard. Numerical model is chosen as a tool to study the barotropic tides. Model results are compared against measured sea level and drifters. Numerical modeling and observation of tides point that the tidal amplitude does not change strongly in these fjords but the tidal currents are enhanced in several locations, namely at the entrance to the Dickson Fjord, in the narrow passages in proximity to Svea, and in the central part of Van Keulenfjorden. As the strongest currents have been found at the passages at Akseløya Island we have focused our research on this location. The narrow northern channel (Akselsundet) at Akseløya is the main waterway to Svea coal mines. Tidal currents computed and observed at the northern tip of Akseløya Island can reach amplitude from 2 to 3 m s À1 . Observation of the deployed drifters and calculation of the seeded particles in the passage at Akseløya depicted a complicated pattern of eddies. The jet-like currents and eddies are quite different at the ebb and flood tide phases. As the Akseløya Island orientation relative to the shore is different for the flood and ebb waters the flow through Akselsundet is differently constrained by this geometry. The observations show that the oscillating tidal motion causes large excursions of the water particle. The drifters released in the passage during flood ended up trapped in the eddy on the eastern side of the island. # 2015 Institute of Oceanology of the Polish Academy of Sciences. Production and hosting by Elsevier Sp. z o.o. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Discussionmentioning

confidence: 99%

Tidal currents in the western Svalbard Fjords

Kowalik

Marchenko²,

Brazhnikov

et al. 2015

Oceanologia

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“…The flow over curved surfaces has ample applications in engineering such as the ones described by Freund (1994), Chang et al (2009), Lee et al (2007), Lalli, et al (2010), Mabey et al (2011), and Kim et al (2006). In recent decades, the Coanda effect has been used in the design of the Rheolytic Thrombectomy devices, which proves its multidimensional applicability, which has been demonstrated by Chung et al (2009).…”

Section: Recent Applications Of Coanda Adhesionmentioning

confidence: 99%

Mathematical Model of a Constructal Coanda Effect Nozzle

Trancossi¹,

Stewart²,

Subhash³

et al. 2016

JAFM

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This paper analyses the ACHEON Coanda effect nozzle for aircraft propulsion, based on the dynamic equilibrium of two jet streams. The ACHEON concept, and, in particular, the HOMER nozzle, which is its main component, are presented, together with the literature milestones from which the idea originally stems. A subsystem analysis inspired by the principles of Constructal Theory is presented for the current architecture. A mathematical model of a 2D case of the system is developed, focusing on the combined effect of the mixing of the two streams and the Coanda adhesion over a convex surface. A validation of the model is also reported, based on 2D CFD analyses, under the hypothesis of incompressible flow. Results highlight that, in spite of its relative simplicity, the model produces accurate results.

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“…WAve Model (WAM) and Simulating WAves Nearshore model (SWAN). On the other hand, with regard to coastal currents, depth-averaged 2D equations are widely used in the hypothesis of hydrostatic pressure distribution (Lloyd & Stansby 1997;Lalli et al 2004Lalli et al , 2007Lalli et al , 2010. Wave-current interaction, in this framework, is tackled by means of the radiation stress approach (Longuet-Higgins & Stewart 1964) to take into account the mean flow induced by wave motion.…”

Section: Introductionmentioning

confidence: 99%

A numerical model for wave-current interaction at the scale of marine engineering

Lalli

Bruschi

Cassese

et al. 2016

Journal of Operational Oceanography

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In the present paper a numerical method for marine and coastal hydrodynamics is presented. It aims at developing a formulation for the complete wave-current coupling in the time domain. In this framework, both waves and currents are handled by complete Navier-Stokes equations. Indeed, waves are modified by currents and interaction with structures, the flow is forced by waves and structures as well. The numerical solution for fully 3D equations is outlined, showing that the proposed procedure is a revisited version of the fractional step method, i.e. the free surface fractional step method. Some numerical test cases in simple 2D geometries (vertical direction vs direction of wave propagation) are shown.

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Coanda effect in coastal flows

Cited by 19 publications

References 17 publications

Tidal currents in the western Svalbard Fjords

Tidal currents in the western Svalbard Fjords

Mathematical Model of a Constructal Coanda Effect Nozzle

A numerical model for wave-current interaction at the scale of marine engineering

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