Numerical Analysis of Free-Surface Flows under Various Conditions in Acceleration : Improvement of CIP-LSM : CIP-Based Level Set &amp; MARS(&lt;Special Issue&gt;The Forefront of Multi-Physics CFD/EFD)

Himeno, Takehiro; Negishi, Hideyo; Nonaka, Satoshi; Inoue, Chihiro; Watanabe, Toshinori; Uzawa, Seiji

doi:10.1299/kikaib.76.765_778

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…This model can be considered as a type of immersed boundary method by the classification of the calculation method. Details about CIP-LSM are described in a reference [7][8][9] . Modification to add the phase change model is described below.…”

Section: Numerical Methods With Consideration Of a Phase Changementioning

confidence: 99%

“…Although development requires a considerable amount of data to be available, even conducting one space experiment is extremely expensive [3][4][5][6] . To improve the above situation, in this research, the use of a numerical approach was attempted to predict the thermal behavior of two-phase flows by developing a numerical model to consider the phase change at the liquid surface and implementing it in CIP-LSM [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Umemura

Himeno

Watanabe

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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In present space exploration, cryogenic fluids are used as rocket propellant. In order to extend the flight hours of such rockets, the amount of unusable propellant must be reduced by optimizing thermal management for cooling and storage of cryogenic fluids under microgravity conditions. However, in space exploration and development, where the safety and effectiveness of missions are critical, the application of boiling heat transport is not sufficiently reliable with present technology due to the lack of knowledge and experiments. This study aims to analyze boiling with a numerical method for two-phase flow considering phase change. CIP-LSM (CIP-based Level Set & MARS) is a numerical method for free surface flows that uses an interface tracking method to resolve an interface sharply. This enables more accurate estimation of the mass and energy transfer through the interface than by conventional methods. It is also stable and robust for calculations with large density and viscosity ratios of up to 1000. In the present study, a new model was implemented to the original CIP-LSM, which considers the volume change and latent heat to clarify the velocity and heat flux jump between liquid-gas interfaces. This paper presents the analysis of single bubble behavior during nucleate boiling on or near a heated surface in order to validate the reliability of this model. The phase change was predicted with sufficient accuracy, and the numerical results showed good agreement with the experimental results. Nomenclature= Time [s] = Density [kg/m 3 ] = Velocity [m/s] = Internal energy [J/kg] = Static temperature [K] = Static pressure [Pa] = Distance function from interface (level set function) [m] q = Heat flux [W/m 2 ] = Specific heat at constant p [J/kg/K] = Sound velocity [m/s] = First viscosity coefficient [Pa•s] = Second viscosity coefficient [Pa•s] = Thermal conductivity [W/m/K] 2 = Surface tension [N/m] = Acceleration of gravity [m/s 2 ] = Normal vector at the interface [-] = Dirac's delta function [1/m] = Latent heat [J/kg] = Jacobin [1/m 3 ] = Nabla operator [1/m] Subscripts: = Gas phase . = Liquid phase

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Section: Numerical Methods With Consideration Of a Phase Changementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Umemura

Himeno

Watanabe

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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“…Here, the iterations in the SOR method are stopped when numerical variation of pressure during two iteration timings, which is divided by the initial pressure value at the inlet, become less than 3.0×10 -6 , i.e., the criterion that we have employed for various problems [11,16]. An interpolation check is also added during this calculation to control nonphysical oscillation and to maintain monotonicity [17].…”

Section: The Deterministic Compressible Navier-stokes Equation and Bamentioning

confidence: 99%

Deterministic and stochastic computations of mysterious internal flows: based on a nonlinear local correction method with global conservativity

Konagaya

Naitoh

Kijima

2020

JASSE

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The present paper shows a new approach for solving two types of fluid problems, which has recently emerged and has been an unsolved mysteriously for over 100 years. The first problem emerged recently is a very small amount of numerical errors comparable to pollutant emissions such as unburned hydrocarbon fuel (HC) and NOx at order of ppm or less. A new nonlinear numerical method of global and local corrections for the deterministic compressible Navier-Stokes equation for multi-components of gases is proposed and tested to overcome this first problem, while accurately evaluating fluid-dynamic instability related to turbulence and thermal efficiency as result of spatially-integrated thermodynamic quantities, related to total amount of CO2 exhausted, in power systems including combustion engines. It is stressed that the present nonlinear correction method applied for the stochastic Navier-Stokes equation is also effective for the second mysterious problem which has been unsolved for over 100 years, which is the spatial transition point from laminar to turbulent flows in pipes.

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“…(3) is also computed as a correction for a low Mach number regime (Naitoh and Kuwahara, 1992;Takewaki et al, 1985;Yabe and Wang, 1991), which can be done by an inverse matrix calculation such as the successive over-relaxation (SOR) method (Roache, 1976). An interpolation check is also added during this calculation to control nonphysical oscillation and to maintain monotonicity (Himeno et al, 2007).…”

Section: Advection Phasementioning

confidence: 99%

Unsteady three-dimensional computations and experiments of compression flow formed by collision of supermulti-jets

Tsuru

Konagaya

Kawaguchi

et al. 2018

JTST

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The single-point compression principle, based on the collision of pulsed supermulti-jets, which is proposed in our previous reports, has the potential of obtaining both a high compression ratio and relatively low combustion noise, leading to a lower exhaust gas temperature, i.e., high thermal efficiency for the next generation of engines. The supermulti-jets also enclose high-temperature combustion gas around the chamber center, which means less heat loss to the chamber wall, i.e., higher thermal efficiency due to the air-insulation effect. Here, experimental and computational visualizations around the compression point should be examined in order to confirm the occurrence of single-point compression. Thus, in the present paper, we present experimental Schlieren photographs of flows formed by the collision of supermulti-jets without combustion and the results of unsteady three-dimensional computations conducted with the compressible Navier-Stokes equations, while the Cubic Interpolated pseudo-Particle (CIP) and Combined Unified Procedure (CUP) method is employed as numerical algorithm. Comparison of the experimental and computational results show fairly good agreement in time and space. Schlieren photographs and computational visualizations obtained for various conditions of four-, eight-, and sixteen-nozzles of jets are axial symmetrical, which will indicate the single-point compression based on the collision of supermulti-jets. Computations for asymmetrical distribution of seven nozzles also bring results showing nearly symmetric flow.

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Numerical Analysis of Free-Surface Flows under Various Conditions in Acceleration : Improvement of CIP-LSM : CIP-Based Level Set & MARS(<Special Issue>The Forefront of Multi-Physics CFD/EFD)

Abstract: MARS ）， was developed 亡 o simulate three − dirnerlsional free − surface Hows under varieus gravity conditions ， which has been appl 弖 ed to cLarify the dyna 而 c behavior of 1 ｛ quid propellant in the tanks of launch vChicles ．

Cited by 9 publications

References 12 publications

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Deterministic and stochastic computations of mysterious internal flows: based on a nonlinear local correction method with global conservativity

Unsteady three-dimensional computations and experiments of compression flow formed by collision of supermulti-jets

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Numerical Analysis of Free-Surface Flows under Various Conditions in Acceleration : Improvement of CIP-LSM : CIP-Based Level Set & MARS(<Special Issue>The Forefront of Multi-Physics CFD/EFD)

Abstract: MARS ） ， was developed 亡 o simulate three − dirnerlsional free − surface Hows under varieus gravity conditions ， which has been appl 弖 ed to cLarify the dyna 而 c behavior of 1 ｛ quid propellant in the tanks of launch vChicles ．

Cited by 9 publications

References 12 publications

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Numerical Analysis on Boiling Flow in Surface Tension Dominant Environment

Deterministic and stochastic computations of mysterious internal flows: based on a nonlinear local correction method with global conservativity

Unsteady three-dimensional computations and experiments of compression flow formed by collision of supermulti-jets

Contact Info

Product

Resources

About

Abstract: MARS ）， was developed 亡 o simulate three − dirnerlsional free − surface Hows under varieus gravity conditions ， which has been appl 弖 ed to cLarify the dyna 而 c behavior of 1 ｛ quid propellant in the tanks of launch vChicles ．