Shock-Capturing Characteristics Models for Transient Vaporous Cavitation in Pipe Flow

Pezzinga, Giuseppe; Santoro, Vincenza Cinzia

doi:10.1061/(asce)hy.1943-7900.0001811

Cited by 4 publications

(10 citation statements)

References 15 publications

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“…The momentum equation of the quasi-2D model is expressed in cylindrical coordinates in the form [22,23]:…”

Section: Mathematical Model 21 Continuity and Momentum Equationsmentioning

confidence: 99%

“…where τ is the shear stress. Information on the turbulence model can be found in a paper by Pezzinga and Santoro [23].…”

Section: Mathematical Model 21 Continuity and Momentum Equationsmentioning

confidence: 99%

“…The Z-mirror numerical scheme adopted here (Figure 1) was initially proposed for vaporous cavitation transient pipe flow [23] and already successfully applied to transient flow in viscoelastic pipe [22]. Details on the Z-mirror scheme can be found in the cited references.…”

Section: Numerical Schemementioning

confidence: 99%

“…Based on these latter results, this paper compares the KV model and GKV models with a different number of elements in tests with cavitation. An implementation is used of the MOC, called MOC-Z, positively tested for transient cavitating pipe flow [23] and for transient flows in viscoelastic pipes [22]. A unified treatment of both viscoelasticity and cavitation in transient pipe flow is proposed.…”

Section: Introductionmentioning

confidence: 99%

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MOC-Z Model of Transient Cavitating Flow in Viscoelastic Pipe

Pezzinga

2024

Water

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In this paper, a unitary method for the solution of transient cavitating flow in viscoelastic pipes is proposed in the framework of the method of characteristics (MOC) and a Z-mirror numerical scheme (MOC-Z model). Assuming a standard form of the continuity equation allows the unified treatment of both viscoelasticity and cavitation. An extension of the MOC-Z is used for Courant numbers less than 1 to overcome a few cases with numerical instabilities. Four viscoelastic models were considered: a Kelvin–Voigt (KV) model without the instantaneous strain, and three generalised Kelvin–Voigt models with one, two, and three KV elements (GKV1, GKV2, and GKV3, respectively). The use of viscoelastic parameters of KV and GKV models calibrated for transient flow tests without cavitation allows good comparisons between experimental and numerical pressure versus time for transient tests with cavitation. Whereas for tests without cavitation, the mean absolute error (MAE) always decreases when the complexity of the model increases (from KV to GKV1, GKV2, and GKV3) for all the considered tests, this does not happen for tests with cavitation, probably because the decreasing capacity of parameter generalization for the increasing complexity of the model. In particular, in the examined cases, the KV model performs better than the GKV1 and the GKV3 models in three cases out of five, and the GKV2 model performs better than the GKV3 model in three cases out of five. Furthermore, the GKV2 model performs better than the KV model only in three cases out of five.

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“…The momentum equation of the quasi-2D model is expressed in cylindrical coordinates in the form [22,23]:…”

Section: Mathematical Model 21 Continuity and Momentum Equationsmentioning

confidence: 99%

“…where τ is the shear stress. Information on the turbulence model can be found in a paper by Pezzinga and Santoro [23].…”

Section: Mathematical Model 21 Continuity and Momentum Equationsmentioning

confidence: 99%

Section: Numerical Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MOC-Z Model of Transient Cavitating Flow in Viscoelastic Pipe

Pezzinga

2024

Water

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“…Also, it was found that cone angle of spray is noticeably affected by cavitating flow inside the nozzle. There was a study in which a two-dimensional approach was used on a nozzle that had material of acrylic resin [20]. Cavitation occurs when the local pressure falls below the fluid's vapor pressure, resulting in the development of bubbles in a liquid flow, resulting in a two-phase combination of liquid and vapor/gas.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cavitation Formation on Velocity and Vorticity

Ferdowsian¹

2022

IJSEA

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In this study, flow in a rectangular shape nozzle has been simulated. Fully hexahedral mesh elements are utilized with having boundary layer mesh in order to avoid excessive mesh destiny in the orifice area. It was found that velocity magnitude, axial velocity and vorticity magnitude increases intensely at the beginning of the orifice area which makes it possible for the cavitation phenomena to occur rapidly. The cavitation that occurs inside diesel fuel injector nozzles has a significant impact on atomization, and modelling this phenomenon will be useful in future injector development. The Schnerr cavitation model was chosen among three distinct cavitation models available in Ansys Fluent v21 because it is capable of properly forecasting choke conditions in cavitating flow. The two-phase flow inside a nozzle is assumed to be a homogenous combination of vapor, liquid, and noncondensable gas in this model. The pressure and velocity profiles derived from the simulations were compared to planar throttle flow experimental findings.

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Comparative assessment of the inline and branching design strategies based on the compound technique

Triki

2020

Journal of Water Supply: Research and Technology-Aqua

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The inline or branching water hammer control strategies, which are based on the insertion of compound plastic short-penstock or -inline section at the transient-induced region of main pipes, illustrated a promising ability to upgrade steel pipe-based hydraulic systems concerning the extension of admissible pressure level. In this respect, prior results suggested that the specific layout utilizing an (HDPE–LDPE) compound short-penstock (where the (HDPE) sub-short-penstock is attached to the main steel pipe and the (LDPE) sub-short-penstock corresponds to the short-penstock dead-end side) provided significant attenuation of pressure magnitude. Concurrently, recent studies concluded that the (HDPE–LDPE) compound short-section-based inline strategy provided substantial attenuation of pressure magnitude. However, these strategies illustrated a drawback relying on the expansion of the period of pressure wave oscillations. Accordingly, this study assessed and compared the capacities of the compound technique concerning the trade-off between the magnitude-attenuation and the period-expansion of pressure wave oscillations. The findings of these analyses evidenced that (HDPE–LDPE) compound short-penstock particular setup of the branching strategy allowed the best trade-off between the attenuation of magnitude and the period expansion of pressure wave oscillations. Furthermore, results showed the competitiveness of the latter upgrading strategy as compared to the (HDPE) or (LDPE) main pipe-based renewed hydraulic systems.

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Shock-Capturing Characteristics Models for Transient Vaporous Cavitation in Pipe Flow

Cited by 4 publications

References 15 publications

MOC-Z Model of Transient Cavitating Flow in Viscoelastic Pipe

MOC-Z Model of Transient Cavitating Flow in Viscoelastic Pipe

Effect of Cavitation Formation on Velocity and Vorticity

Comparative assessment of the inline and branching design strategies based on the compound technique

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