Numerical Simulation of Jet Flow Issued Into Density-Stratified Fluid by Vortex in Cell Method

Shakouchi, Shogo; Shimada, Seiji; Uchiyama, Tomomi

doi:10.17654/15-aafm-01701-115

Cited by 5 publications

(7 citation statements)

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“…It also clarified the mixing phenomena caused by the jet. The authors [6] also conducted a numerical simulation under the same conditions as those in the previous experiment [5] and confirmed the validity of the simulation method.…”

Section: Introductionsupporting

confidence: 62%

“…The mask function χ on the right-hand side of Equation (2) Because χ, as given by Equation (5), is not continuous at the wall of the tank, this study uses a revised mask function χ 1 instead of χ to guarantee continuity: represented by the IB method using Equation (6). Non-slip conditions are imposed on the tank bottom and side wall, whereas slip conditions are applied at the upper boundary.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

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Numerical Simulation of Jet Issuing Diagonally Upward into Density-Stratified Fluid in Cylindrical Tank

Degawa¹,

Uchiyama²,

Aozasa³

et al. 2018

JPEE

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This study simulates the behavior of a jet issuing into a two-layer density-stratified fluid in a cylindrical tank and the resulting mixing phenomena. The upper and lower fluids are water and an aqueous solution of sodium chloride (NaCl), respectively, with the lower fluid issuing diagonally upward from a nozzle on the bottom of the tank. The angle between the centerline of the jet and the tank bottom is 60˚. The phenomena when the Reynolds number Re of the jet is 475, 1426, and 2614 are simulated. The mass concentration of the aqueous solution of NaCl is 0.02. The simulation successfully grasps the jet behavior and the resulting mixing, which agree with the authors' experimental results at the corresponding Re value. The secondary flows that appear in the horizontal cross-sections consist of a pair of vortices and flows along the tank wall. The secondary flow at the density interface represents the intrusion of an internal density current, which gives rise to mixing along the interface.

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Section: Introductionsupporting

confidence: 62%

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Numerical Simulation of Jet Issuing Diagonally Upward into Density-Stratified Fluid in Cylindrical Tank

Degawa¹,

Uchiyama²,

Aozasa³

et al. 2018

JPEE

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“…The method was based on a vortex in cell method, which discretizes the vorticity D DAVID PUBLISHING Tank 118 field into vortex elements and computes the time evolution of the flow by tracing the convection of each vortex element. Shakouchi et al [8] performed the jet simulation at the same conditions as their previous experiment [7] and confirmed the validity of the simulation method by comparing the simulated results with the experimental ones. The abovementioned authors' studies [7,8] successfully clarified the jet behavior and presented the simulation method.…”

mentioning

confidence: 59%

“…Shakouchi et al [8] performed the jet simulation at the same conditions as their previous experiment [7] and confirmed the validity of the simulation method by comparing the simulated results with the experimental ones. The abovementioned authors' studies [7,8] successfully clarified the jet behavior and presented the simulation method. But the mixing between the jet and the ambient fluid as well as the fluid velocity deeply interacting with the mixing is not fully elucidated.…”

mentioning

confidence: 59%

“…They also demonstrated that the maximum height of the jet can be predicted by the Froude number defined by the jet velocity and the density difference between the upper and lower fluids. The current authors [8] also proposed a simulation method for a jet issued into a two-layer density-stratified fluid. The method was based on a vortex in cell method, which discretizes the vorticity D DAVID PUBLISHING Tank 118 field into vortex elements and computes the time evolution of the flow by tracing the convection of each vortex element.…”

mentioning

confidence: 99%

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Study of the Jet-Induced Mixing of Two-Layer Density-Stratified Fluid in a Rectangular Tank

Shakouchi¹,

Fukue²,

Uchiyama³

2015

JEPE

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Abstract:The mixing phenomena of a two-layer density-stratified fluid induced by a jet in a tank are experimentally investigated. The upper and lower fluids are water and a NaCl-water solution, respectively, with the lower fluid issued vertically upward from a nozzle at the bottom of the tank. The jet Reynolds number Re, defined by the jet velocity and the water kinematic viscosity, ranges from 90 to 4,200. The mass concentration of the NaCl-water solution C 0 is less than 0.08. The flow visualization makes clear the jet behavior relative to the density interface between the upper and lower fluids. The measurement of the concentration distribution of the water paint issued with the jet highlights the effects of Re and C 0 on the mixing between the jet and the ambient fluid. The measurement of the fluid velocity distribution with a PIV (particle image velocimetry) system successfully elucidates the relationship between the velocity field and the resultant mixing.

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Mixing of Density-Stratified Fluid in a Cylindrical Tank by a Diagonal Jet

Degawa¹,

Uno²,

Uchiyama³

2018

JEPE

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This study experimentally investigates the mixing of two-layer density-stratified fluid in a cylindrical tank by a diagonal jet. The upper and lower fluids are water and an aqueous solution of sodium chloride (NaCl), respectively, and the lower fluid issues from a nozzle on the tank bottom. The angle between the jet centerline and the tank bottom is 60°, and the mass concentration of the NaCl solution is 0.02. The mixing in cases that the Reynolds numbers of the jets are 713, 2319, and 3565 is investigated. The velocity fields in the central vertical cross-section are measured with a PIV (particle imaging velocimetry) system by tracing nylon particles with the diameter of 80 μm. The concentration fields in the section are visualized using Rhodamine B as the fluorescent dye. They are also measured using PLIF (planer laser induced fluorescence) from visualized images and the progresses of the mixing are evaluated quantitatively. The investigation clarifies the relationship between the mixing phenomena and the Reynolds number of the jet.

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Numerical Simulation of Jet Flow Issued Into Density-Stratified Fluid by Vortex in Cell Method

Cited by 5 publications

References 0 publications

Numerical Simulation of Jet Issuing Diagonally Upward into Density-Stratified Fluid in Cylindrical Tank

Numerical Simulation of Jet Issuing Diagonally Upward into Density-Stratified Fluid in Cylindrical Tank

Study of the Jet-Induced Mixing of Two-Layer Density-Stratified Fluid in a Rectangular Tank

Mixing of Density-Stratified Fluid in a Cylindrical Tank by a Diagonal Jet

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