Search results for "Secondary air injection"

showing 3 items of 3 documents

Viscous fingering in magnetic fluids: numerical simulation of radial Hele–Shaw flow

1999

Abstract In this paper, the viscous fingering phenomena of the magnetic liquids in the case when the magnetic field is applied normally to the Hele–Shaw cell is investigated by the numerical simulation technique. It is shown that the magnetic field causes additional destabilization of the free interface arising at the air injection in the magnetic liquid. Here the peculiarities of the interface dynamics – inward motion of the tips of the fjords, the gyration radius dependence on the perimeter found by the numerical simulations are in good accordance with the experiments.

Materials scienceComputer simulationDynamics (mechanics)MechanicsRadiusCondensed Matter PhysicsGyrationElectronic Optical and Magnetic MaterialsMagnetic fieldCondensed Matter::Soft Condensed MatterPhysics::Fluid DynamicsViscous fingeringHele-Shaw flowClassical mechanicsSecondary air injectionJournal of Magnetism and Magnetic Materials
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Numerical prediction of ventilated planing flat plates for the design of Air Cavity Ships

2017

In recent years, a great world issue is the respect for the environment. Each researcher, in his competence field, proposes new technologies and new approaches in order to reduce the environmental impact of a product or of an industrial process. In the naval field, the main way in order to reduce the environmental impact of the ship during the navigation is the reduction of the drag resistance and so the reduction of requested power. There are many ways in order to obtain a reduction of drag. This paper investigates, with a preliminary numerical study by means of Computational Fluid Dynamics (CFD), the Air Cavity Ships technology (ACS). A first part of the paper concerns the study of the ri…

Lift coefficientEngineeringDrag coefficientBubbleMechanical engineering020101 civil engineering02 engineering and technologyComputational fluid dynamics01 natural sciencesIndustrial and Manufacturing Engineering010305 fluids & plasmas0201 civil engineeringArtificial ventilationPlaning hull design0103 physical sciencesSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeAir Cavity Shipbusiness.industrySolverDragModeling and SimulationEngineering design processbusinessCFDSecondary air injectionGreen design
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A preliminary method for the numerical prediction of the behavior of air bubbles in the design of Air Cavity Ships

2016

Air-cavity ships (ACS) are advanced marine vehicles that use air injection under hull to improve the vessel’s hydrodynamic characteristics. Although the concept of drag reduction by supplying gas under the ship’s bottom was proposed in the 19th century by Froude and Laval, at this time there are not many systematic studies on this subject. This paper is a preliminary work with the purpose of being a basic tool for the design of the ACS with computational fluid dynamic methods. The study aims to conduct a series of computational tests to compare the numerical models of bubble with experimental data. The first step of this study was to investigate the behavior of free bubble in water, conside…

EngineeringBubbleAerospace Engineering020101 civil engineering02 engineering and technologyComputational fluid dynamics01 natural sciencesCritical mass (software engineering)010305 fluids & plasmas0201 civil engineeringPhysics::Fluid Dynamicssymbols.namesakeHull0103 physical sciencesFroude numberNautical designSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeAir Cavity ShipFluid Flow and Transfer Processesbusiness.industryMechanical EngineeringDragAutomotive EngineeringsymbolsHull ventilationbusinessReduction (mathematics)CFDHigh-speed craft designSecondary air injectionMarine engineering
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