Numerical Study on the Tandem Submerged Hydrofoils Using RANS Solver

This paper is presented on the tandem two-dimensional hydrofoils with profiles NACA4412 in single-phase and two-phase flow domains for different submergence depths and different distances in a various angle of attack (AoA). Also, supercavitation is studied at σ=0.34 by the Zwart cavitation model. Re...

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Bibliographic Details
Published in:Mathematical problems in engineering 2021-02, Vol.2021, p.1-17
Main Authors: Maram, Moloud Arian, Ghafari, Hamid Reza, Ghassemi, Hassan, Ghiasi, Mahmoud
Format: Article
Language:English
Subjects:
Aerodynamic coefficients
Angle of attack
Cavitation
Computational fluid dynamics
Domains
Drag coefficients
Finite volume method
Flow separation
Free surfaces
Hydrodynamic coefficients
Hydrofoils
Investigations
Mathematical problems
Reynolds number
Shear stress
Simulation
Supercavitating flow
Transient analysis
Turbulence models
Two phase flow
Velocity
Viscosity
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Summary:This paper is presented on the tandem two-dimensional hydrofoils with profiles NACA4412 in single-phase and two-phase flow domains for different submergence depths and different distances in a various angle of attack (AoA). Also, supercavitation is studied at σ=0.34 by the Zwart cavitation model. Reynolds-averaged Navier–Stokes (RANS) with the shear stress transport (SST) K-ω is employed as a turbulence model in transient analysis of Ansys FLUENT software. The numerical results show that, by increasing depth, the drag coefficient increases for both hydrofoils 1 and 2 as well as the lift coefficient. The drag coefficient of hydrofoil 2 is bigger than hydrofoil 1 for all depths; moreover, it was found that the flow pressure behind the hydrofoil 1 had affected the upper and the lower surface of the hydrofoil 2 at each distance or AoA. These effects are observed in the hydrofoil 2 lift coefficient as well as the flow separation. However, the maximum lift-to-drag ratio is observed at AoA = 8° and 3.5c distance. Also, single-phase results reveal that the value of pressure and the hydrodynamic coefficient are very different from the two-phase flow results, due to the elimination of the free surface. So, a two-phase flow domain is recommended for increasing the accuracy of results. In addition, the investigation of supercavitation shows a growth in cavity occurrence on the surface by raising AoA.
ISSN:1024-123X
1563-5147
DOI:10.1155/2021/8364980