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**Harvard**

van Wachem, B. och Gopala, V. (2006) *A coupled solver approach for multiphase flow calculations on collocated grids*.

** BibTeX **

@conference{

van Wachem2006,

author={van Wachem, Berend and Gopala, Vinay},

title={A coupled solver approach for multiphase flow calculations on collocated grids},

booktitle={European Conference on Computational Fluid Dynamics},

pages={1-16},

abstract={Because of increasing computer speed and memory, the numerical solution of the
incompressible Navier-Stokes equations by a fully coupled approach is an
attractive and emerging trend in computational fluid dynamics (CFD)
calculations. The main advantage of this approach is an increased robustness
due to the implicit treatment of the pressure velocity coupling
Although the equations describing multiphase
flows appear similar to single-phase flow equations, their nature is often much
more difficult due to the presence of volume fractions, large source terms, and
gradients of these as well as density. This makes the requirement for a robust
solving approach even more desirable.
Almost all multiphase CFD solvers
today are based upon standard decoupled approaches (SIMPLE, SIMPLER, PISO, fractional step, and other pressure projection methods)
and most often employ a staggered variable arrangement. In this paper, momentum
weighted interpolation is used to determine analytical expressions for the cell
face velocities which are employed in the multiphase continuity equation in a
collocated variable arrangement. A special approach is adopted for the momentum
weighted interpolation to handle large source terms, volume fractions, and
gradients of these. The resulting linearized equations are solved in a fully
coupled manner.
The fully coupled method is demonstrated on two practical
multiphase cases. Firstly, the method is demonstrated simulating
volume of fluid (VOF) computations of a gas-liquid flow case.
Secondly, the method is demonstrated on solving the
continuous part of an Euler-Lagrange gas-solid flow problem. The difficulties
in the first case are large source terms and gradients of density, and in the
second case the presence of volume fraction and gradients hereof, as well as
source terms.
The results are in accordance with results from the
staggered segregated approach. Moreover, due to the collocated variable
arrangement, complex geometries can be easily handeled. Both robustness and
computational efficiency of this fully coupled approach are shown.},

year={2006},

keywords={Multiphase flow, coupled solver, collocated grids},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 23046

A1 van Wachem, Berend

A1 Gopala, Vinay

T1 A coupled solver approach for multiphase flow calculations on collocated grids

YR 2006

T2 European Conference on Computational Fluid Dynamics

SP 1

OP 16

AB Because of increasing computer speed and memory, the numerical solution of the
incompressible Navier-Stokes equations by a fully coupled approach is an
attractive and emerging trend in computational fluid dynamics (CFD)
calculations. The main advantage of this approach is an increased robustness
due to the implicit treatment of the pressure velocity coupling
Although the equations describing multiphase
flows appear similar to single-phase flow equations, their nature is often much
more difficult due to the presence of volume fractions, large source terms, and
gradients of these as well as density. This makes the requirement for a robust
solving approach even more desirable.
Almost all multiphase CFD solvers
today are based upon standard decoupled approaches (SIMPLE, SIMPLER, PISO, fractional step, and other pressure projection methods)
and most often employ a staggered variable arrangement. In this paper, momentum
weighted interpolation is used to determine analytical expressions for the cell
face velocities which are employed in the multiphase continuity equation in a
collocated variable arrangement. A special approach is adopted for the momentum
weighted interpolation to handle large source terms, volume fractions, and
gradients of these. The resulting linearized equations are solved in a fully
coupled manner.
The fully coupled method is demonstrated on two practical
multiphase cases. Firstly, the method is demonstrated simulating
volume of fluid (VOF) computations of a gas-liquid flow case.
Secondly, the method is demonstrated on solving the
continuous part of an Euler-Lagrange gas-solid flow problem. The difficulties
in the first case are large source terms and gradients of density, and in the
second case the presence of volume fraction and gradients hereof, as well as
source terms.
The results are in accordance with results from the
staggered segregated approach. Moreover, due to the collocated variable
arrangement, complex geometries can be easily handeled. Both robustness and
computational efficiency of this fully coupled approach are shown.

LA eng

OL 30