Journal ArticleDOI
Numerical simulation of the unsteady behaviour of cavitating flows
TLDR
In this paper, a 2D numerical model is proposed to simulate unsteady cavitating flows in 2D geometries, where the mixture of liquid and vapour is considered as a single fluid with variable density.Abstract:
A 2D numerical model is proposed to simulate unsteady cavitating flows The Reynolds-averaged Navier–Stokes equations are solved for the mixture of liquid and vapour, which is considered as a single fluid with variable density The vapourization and condensation processes are controlled by a barotropic state law that relates the fluid density to the pressure variations The numerical resolution is a pressure-correction method derived from the SIMPLE algorithm, with a finite volume discretization The standard scheme is slightly modified to take into account the cavitation phenomenon That numerical model is used to calculate unsteady cavitating flows in two Venturi type sections The choice of the turbulence model is discussed, and the standard RNG k–emodel is found to lead to non-physical stable cavities A modified k–emodel is proposed to improve the simulation The influence of numerical and physical parameters is presented, and the numerical results are compared to previous experimental observations and measurements The proposed model seems to describe the unsteady cavitation behaviour in 2D geometries well Copyright © 2003 John Wiley & Sons, Ltdread more
Citations
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Journal ArticleDOI
Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation
TL;DR: In this article, a simulation of turbulent cavitation in a Venturi-type section was performed by two-dimensional computations of viscous, compressible, and turbulent cavitating flows.
Journal ArticleDOI
Large Eddy Simulation and theoretical investigations of the transient cavitating vortical flow structure around a NACA66 hydrofoil
TL;DR: In this paper, the cavitating flow around a NACA66 hydrofoil is studied numerically with particular emphasis on understanding the cavitation structures and the shedding dynamics, including the cavity growth, break-off and collapse downstream.
Journal ArticleDOI
Numerical simulation of three dimensional cavitation shedding dynamics with special emphasis on cavitation–vortex interaction
TL;DR: In this article, the structure of the cavitating flow around a twisted hydrofoil was investigated numerically using the mass transfer cavitation model and the modified RNG k-e model with a local density correction for turbulent eddy viscosity.
Journal ArticleDOI
Numerical analysis of unsteady cavitating turbulent flow and shedding horse-shoe vortex structure around a twisted hydrofoil
TL;DR: In this paper, the Partially-Averaged Navier-Stokes (PANS) method and a mass transfer cavitation model with the maximum density ratio ( ρ l / ρ v,clip ) effect between the liquid and the vapor were used to simulate cavitating turbulent flow around hydrofoils.
Journal ArticleDOI
A joint experimental and numerical study of mechanisms associated to instability of partial cavitation on two-dimensional hydrofoil
TL;DR: In this paper, the authors investigated the mechanisms of instabilities in partial cavitating flow by multipoint wall-pressure measurements together with lift and drag measurements and numerical videos on a two-dimensional hydrofoil section.
References
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Numerical Study of the Turbulent Flow Past an Airfoil with Trailing Edge Separation
C. M. Rhie,W. L. Chow +1 more
TL;DR: In this paper, a methode numerique par volume fini pour the resolution des equations de Navier-Stokes bidimensionnelles, incompressible, and stationnaires, en coordonnees generales curvilignes, is presented.
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A stable and accurate convective modelling procedure based on quadratic upstream interpolation
TL;DR: In this paper, a convective modeling procedure is presented which avoids the stability problems of central differencing while remaining free of the inaccuracies of numerical diffusion associated with upstream differencings.
Journal ArticleDOI
Experimental and Theoretical Investigation of Backward-Facing Step Flow
TL;DR: In this paper, the velocity distribution and reattachment length of a single backward-facing step mounted in a two-dimensional channel were measured using laser-Doppler measurements.
Journal ArticleDOI
Near-wall turbulence models for complex flows including separation
Hamn-Ching Chen,V. C. Patel +1 more
TL;DR: In this paper, the complete fully elliptic, Reynoldsaveraged Navier-Stokes equations have been solved using a low-Reynoldsnumber model, a new two-layer model, and a two-point wall-function method, in the k-s turbulence model, for the boundary layer and wake of two axisymmetric bodies.
Journal ArticleDOI
A test problem for outflow boundary conditions—flow over a backward-facing step
TL;DR: In this paper, a numerical solution for steady incompressible flow over a two-dimensional backward-facing step using a Galerkin-based finite element method was developed, and the Reynolds number for the simulations is 800.