scholarly journals Numerical Modeling Of Two-Phase Flow With Contact Discontinuities

2021 ◽  
Author(s):  
R. Remmerswaal ◽  
A. Veldman
Keyword(s):  
Numerical Modeling ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Contact Discontinuities

scholarly journals Numerical Modeling of Turbulent Swirling Two-Phase Flow in a Centrifugal Classifier

2016 ◽  
Vol 110 ◽  
pp. 01070
Author(s):  
Alexander Shvab ◽  
Pavel Zyatikov ◽  
Marina Goyko
Keyword(s):  
Numerical Modeling ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Numerical Modeling of Two Phase Flow under Centrifugation

2012 ◽  
Vol 326-328 ◽  
pp. 221-226
Author(s):  
Jozef Kačur ◽  
Benny Malengier ◽  
Pavol Kišon
Keyword(s):  
Inverse Problem ◽  
Numerical Modeling ◽  
Numerical Experiments ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Saturated Sample ◽  
Dae Systems ◽  
Capillary Pressure Curves ◽  
Wetting Liquid

Numerical modeling of two-phase flow under centrifugation is presented in 1D.A new method is analysed to determine capillary-pressure curves. This method is based onmodeling the interface between the zone containing only wetting liquid and the zone containingwetting and non wetting liquids. This interface appears when into a fully saturated sample withwetting liquid we inject a non-wetting liquid. By means of this interface an efficient and correctnumerical approximation is created based upon the solution of ODE and DAE systems. Bothliquids are assumed to be immiscible and incompressible. This method is a good candidate tobe used in solution of inverse problem. Some numerical experiments are presented.

scholarly journals NUMERICAL MODELING OF THE DISTRIBUTION OF SNOW LOAD ON A HYPERBOLIC PARABOLOID. THEORETICAL BASIS

2021 ◽  
pp. 43-51
Author(s):  
M.G. Surianinov ◽  
◽  
S. Jgalli ◽  
Al Echcheikh El Alaoui Douaa ◽  
◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Mixture Model ◽  
Two Phase Flow ◽  
Complex Geometry ◽  
Computational Cost ◽  
Phase Flow ◽  
Hyperbolic Paraboloid ◽  
Two Phase ◽  
Ansys Fluent ◽  
Euler Model

Abstract. The paper discusses the choice of a method for studying the distribution of snow loads on a biconcave roof of a hyperbolic paraboloid and its theoretical justification. It is noted that the numerical modeling of the aerodynamic characteristics of buildings and structures is a difficult and resource-intensive task due to the design features of building objects, which, as a rule, have a complex geometric shape, as well as due to a complex unsteady flow resulting from their flow around them. In addition, the task becomes more complicated due to the interference of vortex structures between different objects. Overcoming these objective difficulties became possible with the advent of modern specialized software systems, primarily ANSYS Fluent. Opportunities have appeared for accurate modeling with verification of the results obtained, which implies the use of an effective, well-tested mathematical apparatus. To implement the theory of two-phase flow, two methods based on numerical modeling are mainly used: the Euler-Lagrange method and the Euler-Euler method. The second method is used in the work. Comparative analysis, which investigates two-phase flow around different structures using different turbulence models (including RSM model, SST k-ω model, k-ε model and k-kl-ω model), shows that the k-kl-ω model is the best fit with experiment. ANSYS Fluent supports four multiphase models, i.e. VOF model, Mixture model, Wet Steam and Euler model. Compared to the other three models, the Mixture model provides better stability and lower computational costs, while the Euler model provides better accuracy, but at a higher computational cost . With a rather complex geometry and flow conditions, the use of the RANS approach does not lead to reliable simulation results. Moreover, unsteady turbulent flows cannot be reproduced. In real situations, landslides, saltations, and the suspended state of snow particles are closely related to the real effects of microbursts and bursts present at the surface of the boundary layer. Therefore, in further research, it is advisable to apply alternative approaches to RANS, which include Direct Numerical Simulation (DNS), Large Eddy Simulation (LES), and the hybrid RANS-LES approach to turbulence modeling, which combine efficiency LES techniques in tear-off free zones and the cost-effectiveness of RANS in near-wall areas.

scholarly journals Numerical modeling of local effects on the petroleum reservoir using fixed streamtubes for typical waterflooding schemes

Georesursy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 70-78
Author(s):  
Konstantin A. Potashev ◽  
Alexander B. Mazo
Keyword(s):  
Numerical Modeling ◽  
Two Phase Flow ◽  
Flow Problem ◽  
Constant Thickness ◽  
Oil Reservoir ◽  
Phase Flow ◽  
Two Dimensional ◽  
Petroleum Reservoir ◽  
Local Effects ◽  
Two Phase

The difficulty of numerical modeling of areal methods of flows redistribution in the oil reservoir is the need for detailed resolution of local hydrodynamic effects and the fine geological structure of the reservoir, which are centimeter-wide, at inter-well distances of the order of several hundred meters. The dimension of computational grids of traditional 3D models of such resolution, even for impact areas containing a small number of injection and production wells, turns out to be excessively large for design calculations. To overcome these limitations, it is proposed to perform a detailed simulation of the flow in two-dimensional cross sections of the reservoir along fixed streamtubes of variable width between each pair of interacting injector and producer wells. Reducing the dimension of the problem allows the use of high-resolution grids to simulate short-term local effects. In this paper, we present an algorithm for constructing a single fixed streamtube between injector and producer, which provides a minimum error in calculating of flow rate and water cut using a two-phase flow problem of reduced dimension along the streamtube. The algorithm is demonstrated by the example of the two-dimensional two-phase flow problem neglecting capillary and gravitational forces in a homogeneous reservoir of constant thickness for three waterflooding elements corresponding to seven vertical well flooding patterns – standard and inverted four-spot, five-spot and seven-spot, as well as staggered line drive. For these waterflooding elements, efficient streamtubes have been constructed, the relative width of which is approximated by piecewise linear functions. On the example of a staggered line drive or five-spot well patterns, the width of the effective streamtube was parameterized for an arbitrary ratio of the sides of the waterflood element. Presented streamtubes can be used as ready templates for subsequent modeling of geological and technical treatments in the relevant elements of the water flooding of the oil reservoir.

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