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**Harvard**

Jareteg, K., Ström, H., Sasic, S. och Demazière, C. (2015) *Numerical investigation of instabilities in the two-fluid model for CFD simulations of LWRs*.

** BibTeX **

@conference{

Jareteg2015,

author={Jareteg, Klas and Ström, Henrik and Sasic, Srdjan and Demazière, Christophe},

title={Numerical investigation of instabilities in the two-fluid model for CFD simulations of LWRs},

booktitle={Proc. Joint Int. Conf. Mathematics and Computation (M&C), Supercomputing in Nuclear Applications (SNA) and the Monte Carlo (MC) Method (MC2015)},

isbn={978-0-89448-720-0},

abstract={We present a two-fluid framework for simulation of adiabatic gas-liquid flow. The aim of the
investigation is to confirm and analyze phase instabilities and meso-scale flow patterns for the vapor
phase arising due to instabilities in the two-fluid model. For this purpose, the solver is applied to a set
of two-dimensional, periodic problems with initially flat velocity and void fraction distributions. We
demonstrate the occurrence of such instabilities and we analyze the temporal development of the void
fraction field. The instabilities are shown to emerge from the initially uniform distribution of void, via
a numerically unstable but non-physical distribution leading to the appearance of meso-scale structures.
The importance of the equation discretization schemes is evaluated and it is shown that the lower order
schemes postpone the emergence of the instabilities. Furthermore, horizontally confined systems of
different widths are studied and it is shown that the instabilities do not occur below a certain system
width with the current model formulation and conditions. We also investigate different formulations of
the void fraction equation and we show that not all the proposed formulations are able to capture the
meso-scale structures. The presented results and analysis propose that the appearance of mesoscopic
structures and void instabilities in a typical two-fluid model can be pronounced and thus need to be
recovered in order to accurately model the liquid-vapor flow in nuclear reactors.},

year={2015},

keywords={CFD, Two-fluid model, bubbly flow, void instability},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 221827

A1 Jareteg, Klas

A1 Ström, Henrik

A1 Sasic, Srdjan

A1 Demazière, Christophe

T1 Numerical investigation of instabilities in the two-fluid model for CFD simulations of LWRs

YR 2015

T2 Proc. Joint Int. Conf. Mathematics and Computation (M&C), Supercomputing in Nuclear Applications (SNA) and the Monte Carlo (MC) Method (MC2015)

SN 978-0-89448-720-0

AB We present a two-fluid framework for simulation of adiabatic gas-liquid flow. The aim of the
investigation is to confirm and analyze phase instabilities and meso-scale flow patterns for the vapor
phase arising due to instabilities in the two-fluid model. For this purpose, the solver is applied to a set
of two-dimensional, periodic problems with initially flat velocity and void fraction distributions. We
demonstrate the occurrence of such instabilities and we analyze the temporal development of the void
fraction field. The instabilities are shown to emerge from the initially uniform distribution of void, via
a numerically unstable but non-physical distribution leading to the appearance of meso-scale structures.
The importance of the equation discretization schemes is evaluated and it is shown that the lower order
schemes postpone the emergence of the instabilities. Furthermore, horizontally confined systems of
different widths are studied and it is shown that the instabilities do not occur below a certain system
width with the current model formulation and conditions. We also investigate different formulations of
the void fraction equation and we show that not all the proposed formulations are able to capture the
meso-scale structures. The presented results and analysis propose that the appearance of mesoscopic
structures and void instabilities in a typical two-fluid model can be pronounced and thus need to be
recovered in order to accurately model the liquid-vapor flow in nuclear reactors.

LA eng

OL 30