scholarly journals Conservative discretization of multiphase flow with high density ratios

2014 ◽  
Author(s):  
L. Jofre ◽  
O. Lehmkuhl ◽  
N. Balcázar ◽  
J. Castro ◽  
J. Rigola ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
High Density ◽  
Conservative Discretization ◽  
Density Ratios

Three-Dimensional Lattice Pseudo-Potentials for Multiphase Flow Simulations at High Density Ratios

2015 ◽  
Vol 161 (6) ◽  
pp. 1404-1419 ◽  
Author(s):  
A. Montessori ◽  
G. Falcucci ◽  
M. La Rocca ◽  
S. Ansumali ◽  
S. Succi
Keyword(s):  
Multiphase Flow ◽  
Three Dimensional ◽  
High Density ◽  
Dimensional Lattice ◽  
Flow Simulations ◽  
Density Ratios

A Numerical Study of Flow and Heat Transfer in Rotating Rectangular Channels AR=4 With 45 deg Rib Turbulators by Reynolds Stress Turbulence Model

2003 ◽  
Vol 125 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Mohammad Al-Qahtani ◽  
Hamn-Ching Chen ◽  
Je-Chin Han
Keyword(s):  
Heat Transfer ◽  
Secondary Flow ◽  
Density Ratio ◽  
Convective Transport ◽  
High Density ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Rectangular Channels ◽  
Density Ratios

Computations were performed to study three-dimensional turbulent flow and heat transfer in stationary and rotating 45 deg ribbed rectangular channels for which experimental heat transfer data were available. The channel aspect ratio (AR) is 4:1, the rib height-to-hydraulic diameter ratio e/Dh is 0.078 and the rib-pitch-to-height ratio P/e is 10. The rotation number and inlet coolant-to-wall density ratios, Δρ/ρ, were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the Reynolds number was fixed at 10,000. Also, two channel orientations (β=90deg and 135 deg from the rotation direction) were investigated with focus on the high rotation and high density ratios effects on the heat transfer characteristics of the 135 deg orientation. These results show that, for high rotation and high density ratio, the rotation induced secondary flow overpowered the rib induced secondary flow and thus change significantly the heat transfer characteristics compared to the low rotation low density ratio case. A multi-block Reynolds-Averaged Navier-Stokes (RANS) method was employed in conjunction with a near-wall second-moment turbulence closure. In the present method, the convective transport equations for momentum, energy, and turbulence quantities are solved in curvilinear, body-fitted coordinates using the finite-analytic method.

Efficient GPGPU implementation of a lattice Boltzmann model for multiphase flows with high density ratios

2014 ◽  
Vol 93 ◽  
pp. 1-17 ◽  
Author(s):  
Amir Banari ◽  
Christian Janßen ◽  
Stephan T. Grilli ◽  
Manfred Krafczyk
Keyword(s):  
Lattice Boltzmann ◽  
Multiphase Flows ◽  
High Density ◽  
Lattice Boltzmann Model ◽  
Density Ratios ◽  
Boltzmann Model

A VoF-Based Consistent Mass-Momentum Transport for Two-Phase Flow Simulations

2017 ◽  
Author(s):  
Annagrazia Orazzo ◽  
Isabelle Lagrange ◽  
Jean-Luc Estivalézes ◽  
Davide Zuzio
Keyword(s):  
Density Ratio ◽  
Three Dimensional ◽  
Industrial Applications ◽  
High Density ◽  
Momentum Transport ◽  
Two Phase ◽  
Mass Fluxes ◽  
Numerical Instabilities ◽  
Density Ratios ◽  
Control Volumes

The most part of two-phase flows relevant to industrial applications is characterized by high density ratios that make numerical simulations of such kind of flows still challenging in particular when the interface assumes complex shape and is distorded by high shear. In this paper a new strategy, to overcome the numerical instabilities induced by the large densities/shears at the interface, is described for staggered cartesian grids. It consists in a consistent mass-momentum advection algorithm where mass and momentum transport equations are solved in the same control volumes. The mass fluxes are evaluated through the Volume-of-Fluid color function and directly used to calculate momentum convective term. Two and three-dimensional high-density test cases (the density ratio goes from 103 to 109) are presented. The new algorithm shows signifcantly improvements compared to standard advection methods therefore suggesting the applicability to the complete atomization process simulations.

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