A scalable compressible volume of fluid solver using a stratified flow model

Sementilli, Mae L.; McGurn, Matthew T.; Chen, James M.

doi:10.1002/fld.5169

Cited by 3 publications

(2 citation statements)

References 34 publications

(72 reference statements)

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“…It uses explicit solvers and a stratified flow model to improve scalability, as this allows for a multiphase solution without the reconstruction of the interface. The code is validated in multiple research papers [29,30].…”

Section: Methodology and Simulation Domainmentioning

confidence: 99%

Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability

Sementilli,

Zangeneh,

Chen

2024

Fluids

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Kelvin–Helmholtz instability has been studied extensively in 2D. This study attempts to address the influence of turbulent flow and cross perturbation on the growth rate of the instability and the development of mixing layers in 3D by means of direct numerical simulation. Two perfect gases are considered to be working fluids moving as opposite streams, inducing shear instability at the interface between the fluids and resulting in Kelvin–Helmholtz instability. The results show that cross perturbation affects the instability by increasing the amplitude growth while adding turbulence has almost no effect on the amplitude growth. Furthermore, by increasing the turbulence intensity, a more distinct presence of the inner flow can be seen in the mixing layer of the two phases, and the presence of turbulence expands the range of high-frequency motion significantly due to turbulence structures. The results give a basis for which 3D Kelvin–Helmholtz phenomena should be further investigated using numerical simulation for predictive modeling, beyond the use of simplified 2D theoretical models.

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Section: Methodology and Simulation Domainmentioning

confidence: 99%

Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability

Sementilli,

Zangeneh,

Chen

2024

Fluids

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“…Feng et al [5] demonstrated the two phase stratified flow in three dimensions along with thermal mixing and direct contact condensation by utilizing the CFD approach. To explore the aspects of compressible multiphase flow using a technique that has high parallel efficiency, Sementilli et al [6] considered a stratified flow model. Investigation about the MHD stratified fluid flow over a cylindrical surface incorporating Brownian motion and thermophoresis effects was made by Majeed et al [7].…”

Section: Introductionmentioning

confidence: 99%

Volumetric thermo-convective and stratified prandtl fluid magnetized flow over an extended convectively inclined surface with chemically reactive species

Bilal,

Asadullah,

Pan

et al. 2024

Phys. Scr.

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Substantive applications of stratified flows have been observed in various industrial operating systems. Stratified flows driven by gravity differences possesses pervasive significance in performance of nuclear reactor along with management of safety problems due to pressurized thermal shock and induced water condensation. In addition, thermogravitational stratified regimes also play exclusive role in multiphase processes in diversified engineering disciplines. Therefore, this artifact investigates the thermal and solutally stratified Prandtl fluid flow over an inclined extendable surface with magnetic field aspects. Convective boundary constraints are prescribed at the surface of sheet and chemical reaction of first-order is also accounted. Firstly, problem formulation is conceded in the form of PDEs which are later transformed into ODEs by employing a similar set of variables. Then these ODEs are solved by employing shooting method in collaboration with Runge-Kutta scheme. A comparison of results in restrictive sense with outcomes attained from analytical approach to analyze robustness and accuracy of currently employed schemes is also executed. The results expressing the behavior of the involved parameters on flow distributions are revealed in graphical and tabular formats. It is revealed that the heat and mass flux coefficients increase by up to 41% and 22%, respectively, in the presence of stratification in comparison to the situation when it is absent. The velocity of the fluid is accelerated by uplifting the angle of inclination and buoyancy ratio parameters. By increasing the magnitude of the model flow parameters, the fluid velocity increased. The Prandtl number tends to reduce the temperature and elevate the heat-flux coefficient. The velocity distribution showed a positive trend with the change in the angle of inclination.

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New scaling law for turbulent boundary layers with high surface mass transfer

Zangeneh,

DesJardin,

Chen

2023

Physics of Fluids

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A fundamental understanding of the phenomena occurring in the turbulent boundary layer in the presence of surface blowing is limited, and considerable disagreements persist even in describing primary quantities, such as the boundary layer profile. The theories based on the linear boundary layer equations show that the thickness of the sublayer increases in the presence of surface blowing; therefore, the viscous sublayer and law of the wall modify. In this study, direct numerical simulations (DNS) of turbulent boundary layers with uniform surface mass transfers are carried out in order to scale the velocity profile. Emphasis is placed on moderate to high mass transfer rates, which are relevant to the most common hybrid rockets configuration. DNS data are used to establish a functional law of the wall and a law of wake by means of the relation between the wall shear stress and surface mass transfer. Analysis of the mean kinetic energy budget shows that the magnitude of turbulent kinetic energy increases by surface mass transfer, and the production rate extends significantly in the inner layer as the injection rate increases. DNS data of various surface blowing are used to complete the closure of turbulence kinetic energy equation and develop an eddy viscosity model. The predicted turbulent kinetic energy and eddy viscosity agree with DNS data for moderate to high blowing rates.

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A scalable compressible volume of fluid solver using a stratified flow model

Cited by 3 publications

References 34 publications

Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability

Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability

Volumetric thermo-convective and stratified prandtl fluid magnetized flow over an extended convectively inclined surface with chemically reactive species

New scaling law for turbulent boundary layers with high surface mass transfer

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