Evaluation of the physical forces exerted on a spherical bubble inside the nozzle in a cavitating flow with an Eulerian/Lagrangian approach

Zeidi, Seyed Mohammad Javad; Mahdi, Miralam

doi:10.1088/0143-0807/36/6/065041

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…Continuity and momentum equations for an incompressible fluid flow can be written as following [1,4]:…”

Section: Numerical Schemementioning

confidence: 99%

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Formation of Cavitation and Supercavitation in a Rectangular Shape Nozzle

Ferdowsian¹

2021

IJSEA

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Flow inside a rectangular shape nozzle is simulated in this study. Finite volume scheme is utilized as the main solver for the current study. Second order scheme is utilized to discretize pressure. Second order upwind scheme is utilized for solving momentum equation. Then the momentum equation is coupled with the continuity equation to obtain the pressure and velocity at each cell. Cavitation inception and super cavitation is also found and discussed in this study and the results were also verified with previous Winklhofer et al. experiments.

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“…Continuity and momentum equations for an incompressible fluid flow can be written as following [1,4]:…”

Section: Numerical Schemementioning

confidence: 99%

“…Spray atomization is affected enormously by turbulence and cavitation in a diesel injector nozzle and then combustion performance is affected as well [1][2][3][4][5]. Cavitation has been investigated widely in real-size diesel injector nozzle even though there are many ambiguous questions remained unanswered.…”

Section: Introductionmentioning

confidence: 99%

Formation of Cavitation and Supercavitation in a Rectangular Shape Nozzle

Ferdowsian¹

2021

IJSEA

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“…6 shows the considered boundry conditions of cumputional grid. Zeidi et al defined a robust way of assigning boundary condition, including assigning wall bounday condition, pressure difference boundary condition and velocity inlet boundary condition which is used in the current study [26].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Numerical Study of Sediment Flow Over Bottom Intake Racks With Flow-3D

Shahri

Khoshnevis

Bina

et al. 2019

int.jour.sci.res.mana.

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Bottom intakes are the most useful structure for diverting the flow of steep rivers and providing specific amount of water for hydropower usage. It is crucial to obtain optimum of physical parameters in order to divert desired discharge with minimum possibility of occlusion. Numerical models can simulate flow and turbulence transport equations at any complex geometries. Numerical methods based on Computational Fluid Dynamics (CFD), are one of the most common methods of numerical simulation that is used in water structures. According to the capabilities of numerical methods, complex modes of flow field over bottom intakes can be analyzed. In the present study, Flow-3D software is used to investigate the experimental results of the previous researcher for sediment and clean water flow over bottom intake with circular bars numerically. This study is carried out in a total of 27 models for clean water and 9 models of sediment flow (Bed-Load) at different approaching flow conditions. Parameters of roughness, size of computational cell, turbulence transport equation, Bed Load Transport equation and bed load coefficient has been calibrated. Validation procedure proved that the accuracy and performance of numerical models appear to be acceptable for designing intake systems. For each test, the discharge coefficient is computed, then by using dimensional analysis, a dimensionless relation derived from the dependent and independent variables and compared with the measured discharge coefficient. Estimating the discharge coefficient by the proposed equation in clean water flow performed a mean error of 6.4 percent and for sediment flow led to a mean error of 4.3 percent.

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“…All Realizable K-ε is being utilized to consider the effect of turbulence. Each term of K and ε is being illustrate separately by Zeidi et al [32][33][34]. In the mentioned study the appropriate conditions in which realizable K-ε turbulence model is needed to used is clarified comprehensively by utilization of finite volume scheme.…”

Section: Transport Equations In Turbulence Modelmentioning

confidence: 99%

Numerical Study of the Gap at the Base of the Bridge on the River Flow Parameters

Oyarhossein¹,

Khiali²,

Hosseinmostofi³

et al. 2019

IJSEA

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In this study, substrate surface channel and bridge piers is modeled by utilization of Ansys Fluent. Continuity and Momentum equations is solved and for the pressure-velocity linkage SIMPLE algorithm is utilized. In order to model turbulence due to relatively high Reynolds value, K-ε is being used. Effect of wall shear stress, velocity magnitude and static pressure is being investigated at different heights thorough substrate longitudinal lines. It was found that different heights of longitudinal lines won't affect static pressure, while it affects velocity magnitude and wall shear stress significantly.

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Evaluation of the physical forces exerted on a spherical bubble inside the nozzle in a cavitating flow with an Eulerian/Lagrangian approach

Cited by 9 publications

References 18 publications

Formation of Cavitation and Supercavitation in a Rectangular Shape Nozzle

Formation of Cavitation and Supercavitation in a Rectangular Shape Nozzle

Numerical Study of Sediment Flow Over Bottom Intake Racks With Flow-3D

Numerical Study of the Gap at the Base of the Bridge on the River Flow Parameters

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