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Computational Thermal Sciences: An International Journal

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ISSN Печать: 1940-2503

ISSN Онлайн: 1940-2554

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VALIDATION OF A MULTIFIELD APPROACH FOR THE SIMULATIONS OF TWO-PHASE FLOWS

Том 7, Выпуск 5-6, 2015, pp. 441-457
DOI: 10.1615/ComputThermalScien.2016015855
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Краткое описание

Safety issues in nuclear power plant involve complex bubbly flows. To predict the behavior of these flows, the two-fluid approach is often used. Nevertheless, this model induces a numerical diffusion of interfaces, which results in a poor accuracy in the calculation of the local parameters. Therefore, to simulate large interfaces such as slugs or free surfaces, interface tracking methods have been developed using the single-fluid model. In this paper, the two approaches have been coupled in the CMFD code NEPTUNE_CFD to simulate adiabatic separated flows. The averaged momentum balance equations are solved for each field and are followed by an artificial compression step, which fixes the interface thickness and ensures mass conservation. Moreover, since the two-fluid model defines a velocity per field in the whole computational domain, a drag force is used to couple the velocity of each field at the interface. This article proposes also a new formulation for this force, to take into account the physical properties of the flow. To validate this approach, an analytical test case with a static bubble has been simulated with a mesh refinement test. Then, the simulations of a rising bubble, an oscillating bubble, and the Kelvin-Helmholtz instability have been performed to highlight the effect of the modification of the drag force. Finally, model comparisons are proposed with the Kelvin-Helmholtz and the Rayleigh-Taylor instabilities.

ЦИТИРОВАНО В
  1. Duponcheel Matthieu, Mimouni Stéphane, Fleau Solène, Bartosiewicz Yann, Experimental and numerical investigations of a two-phase wavy flow, Nuclear Engineering and Design, 321, 2017. Crossref

  2. Fleau Solene, Vincent Stephane, Mimouni Stephane, LES Modeling with a Multifield Approach, in Turbulence and Interactions, 135, 2018. Crossref

  3. Tekavčič Matej, Končar Boštjan, Kljenak Ivo, The concept of liquid inlet model and its effect on the flooding wave frequency in vertical air-water churn flow, Chemical Engineering Science, 175, 2018. Crossref

  4. Mimouni Stephane, Benguigui William, Fleau Solène, Foissac Arnaud, Guingo Mathieu, Hassanaly Mickael, Lavieville Jérôme, Malet Jeanne, Méchitoua Namane, Mérigoux Nicolas, Vincent Stéphane, Dispersed Two-Phase Flow Modelling for Nuclear Safety in the NEPTUNE_CFD Code, Science and Technology of Nuclear Installations, 2017, 2017. Crossref

  5. Benguigui W., Doradoux A., Lavieville J., Mimouni S., Longatte E., A discrete forcing method dedicated to moving bodies in two-phase flow, International Journal for Numerical Methods in Fluids, 88, 7, 2018. Crossref

  6. Mer Samuel, Praud Olivier, Neau Herve, Merigoux Nicolas, Magnaudet Jacques, Roig Veronique, The emptying of a bottle as a test case for assessing interfacial momentum exchange models for Euler–Euler simulations of multi-scale gas-liquid flows, International Journal of Multiphase Flow, 106, 2018. Crossref

  7. Gouénard Solène, Vincent Stéphane, Mimouni Stéphane, Simulations of Turbulent Two‐Phase Flows with Phase Change Using a Multifield Approach Combined with LES, in Fluid Mechanics at Interfaces 1, 2022. Crossref

  8. Davy Germain, Reyssat Etienne, Vincent Stéphane, Mimouni Stéphane, Euler–Euler simulations of condensing two-phase flows in mini-channel: Combination of a sub-grid approach and an interface capturing approach, International Journal of Multiphase Flow, 149, 2022. Crossref

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