Investigation of three-dimensional effects on a cavitating Venturi flow

•An unsteady 3D cavitation sheet is computed with DES and SAS turbulence models.•2D and 3D computations are performed and compared with experimental results.•The 3D computations put in evidence a low frequency, which is absent from 2D computations.•The low frequency is in agreement with recent exper...

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Bibliographic Details
Published in:The International journal of heat and fluid flow 2013-12, Vol.44, p.576-595
Main Authors: Decaix, Jean, Goncalvès, Eric
Format: Article
Language:English
Subjects:
3D effects
Cavitation
Computational fluid dynamics
Computer simulation
Detached eddy simulation
Engineering Sciences
Exact sciences and technology
Fluid dynamics
Fluid flow
Fluid mechanics
Fluids mechanics
Fundamental areas of phenomenology (including applications)
Homogeneous model
Instabilities
Mechanics
Nonhomogeneous flows
Physics
Scale-adaptive model
Three dimensional
Turbulence
Turbulence simulation and modeling
Turbulent flow
Turbulent flows, convection, and heat transfer
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Summary:•An unsteady 3D cavitation sheet is computed with DES and SAS turbulence models.•2D and 3D computations are performed and compared with experimental results.•The 3D computations put in evidence a low frequency, which is absent from 2D computations.•The low frequency is in agreement with recent experimental analysis. A numerical investigation of the behaviour of a cavitation pocket developing along a Venturi geometry has been performed using a compressible one-fluid hybrid RANS/LES solver. The interplay between turbulence and cavitation regarding the unsteadiness and structure of the flow is complex and not well understood. This constitutes a determinant point to accurately simulate the dynamic of sheet cavities. Various turbulent approaches are tested: a new Scale-Adaptive model and the Detached Eddy Simulation. 2D and 3D simulations are compared with the experimental data. An oblique mode of the sheet is put in evidence.
ISSN:0142-727X
1879-2278
DOI:10.1016/j.ijheatfluidflow.2013.08.013