Direct Numerical Simulations of Flows with Phase Change

Tryggvason, Grétar; Lu, Jiacai

doi:10.1016/j.piutam.2015.04.002

Cited by 30 publications

(4 citation statements)

References 52 publications

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“…Phase change simulations present several numerical obstacles [8]. One of the most challenging aspects is notably the discontinuities in the physical properties, occurring at the interface between the two fluids [9].…”

Section: Computational Simulations Of Phase Changementioning

confidence: 99%

Evaluation of a diffuse interface treatment for pressure in phase change simulations using adaptive mesh refinement

Duarte

Villar

Serfaty³

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Phase change computational simulations using a diffuse interface treatment for pressure were investigated in order to quantify the spurious currents and its consequences on the interface transport in the present paper. In addition, benchmarks were conducted with a sharp interface treatment for pressure. Namely, a Delta function method (Delta) was employed for the diffuse interface treatment and a ghost fluid method (GFM) for the sharp approach. An additional force term in the nondivergent form of the momentum equation is proposed for the first time in the literature, and its impact on interface motion during simulations of bubble growth by intense phase change has been quantified. In addition, the influence of recoil force on interface position was evaluated in simulations of water bubble condensation at near critical pressure. Finally, simulations of a complex industrial application were performed using the diffuse interface treatment, namely a case of film boiling with the development of Rayleigh-Taylor instability. Both interface treatments presented excellent results for the interface evolution in time. Even with the presence of some relevant spurious currents in the Delta method, the bubble evolution in time was accurately predicted. The sharp interface treatment potential was especially evident using a mass density flux of 1.0 kg/(m 2 s) or higher. Therefore, a diffuse interface treatment for pressure has been presented as an appropriate strategy for most phase change simulations since the presence of the spurious currents did not disturb the interface position, and its magnitude was low for even moderate phase change intensities. The inclusion of the source term due to the additional force in the non-divergent form of the momentum equation and the recoil force term was irrelevant in the cases tested. Lastly, the film boiling simulation using the diffuse interface treatment revealed the possibility of treating complex 3D cases for industrial applications with this method.

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Section: Computational Simulations Of Phase Changementioning

confidence: 99%

Evaluation of a diffuse interface treatment for pressure in phase change simulations using adaptive mesh refinement

Duarte

Villar

Serfaty³

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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“…Tryggvason and Lu [36] used direct numerical simulation (DNS) for modeling nucleate boiling and bubble generation. The micro region was not considered and the heat release rate at the phase boundary was defined as:…”

Section: Boiling Heat Transfer Models In Cfdmentioning

confidence: 99%

Modelling of Passive Heat Removal Systems: A Review with Reference to the Framatome BWR Reactor KERENA: Part II

et al. 2019

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Passive safety systems are an important feature of currently designed and constructed nuclear power plants. They operate independent of external power supply and manual interventions and are solely driven by thermal gradients and gravitational force. This brings up new needs for performance and reliably assessment. This paper provides a review on fundamental approaches to model and analyze the performance of passive heat removal systems exemplified for the passive heat removal chain of the KERENA boiling water reactor concept developed by Framatome. We discuss modeling concepts for one-dimensional system codes such as ATHLET, RELAP and TRACE and furthermore for computational fluid dynamics codes. Part I dealt with numerical and experimental methods for modeling of condensation inside the emergency condenser and on the containment cooling condenser. This second part deals with boiling and two-phase flow instabilities.

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“…A classification of both can be found in [33]. When dealing with evaporation, a lot of numerical approaches in the literature provide deep insight into its mechanisms [14,18,19,46,47,68,73]. The most promising approaches, which are also able to deal with complex three-dimensional structures as well as extreme conditions, are conducted using the Volume-of-Fluid (VOF) method [49,58,78].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Behaviour of Supercooled Droplets Concerning Evaporation, Sublimation and Freezing Under Different Boundary Conditions

Reutzsch

Kunberger

Reitzle

et al. 2022

Fluid Mechanics and Its Applications

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Phase change processes of supercooled droplets at different boundary conditions are presented. This study is a summary of the current developments within subproject B1 of the SFB-TRR 75 with the focus on evaporation, sublimation, and freezing of supercooled droplets. To this end, new numerical methods to describe the phase transition were developed and novel strategies dealing with the challenges of droplets under extreme conditions are presented. The numerical solution procedure of all phase changes are summarized in a compact way within this work. In order to validate the numerical models, experiments were conducted. For this, new experimental setups and approaches were developed. These comprise a test chamber for optical levitation of supercooled droplets, which is able to trap a droplet by means of a laser beam at subzero temperatures and variable ambient humidity. Comparisons of the numerical simulations and the conducted experiments are presented for several phase change processes. The results are in very good agreement and proof the capability of the methods.

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Direct Numerical Simulations of Flows with Phase Change

Cited by 30 publications

References 52 publications

Evaluation of a diffuse interface treatment for pressure in phase change simulations using adaptive mesh refinement

Evaluation of a diffuse interface treatment for pressure in phase change simulations using adaptive mesh refinement

Modelling of Passive Heat Removal Systems: A Review with Reference to the Framatome BWR Reactor KERENA: Part II

Investigation of the Behaviour of Supercooled Droplets Concerning Evaporation, Sublimation and Freezing Under Different Boundary Conditions

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