Title:
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Numerical simulation of incompressible two phase flows by conservative level set method
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Author:
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Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Castro González, Jesús
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics; Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor |
Abstract:
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A numerical formulation for the Conservative
Level-Set Method of Olsson and Kreiss is
implemented using the finite volume approach. Both
convective term of the interface advection equation
and compression term of the reinitialization equation
are discretized by the first order upwind plus flux
limiter scheme. Time integration is solved by the
TVD Third Order Runge Kutta method, whereas
gradients are computed by the linear Least-Squares
approach. The method is tested computing moving
interfaces with external velocity fields on unstructured
meshes.
Additionally, Level-Set method was coupled
to a variable density Navier-Stokes solver for
incompressible flow TERMOFLUIDS. Physical
properties are assumed to vary smoothly in a
narrow band around the interface to avoid numerical
instabilities. Pressure velocity coupling is solved using
a two step projection method where in the first step the
convection, diffusion and source terms are computed
explicitily using the Adams-Bashforth time integration.
In the second step the velocity is corrected by adding
the gradient of the pressure variable. Numerical
solution of pressure Poisson equation is calculated with
an efficient preconditioned conjugate gradient solver.
Mass conservation and convergence properties of the
model are investigated for cases with large density
and viscosity ratios. For the purpose of validation,
numerical results are compared with numerical and
experimental data for standard benchmark problems. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria mecànica -Level set methods -Two-phase flow -Finite element method -Conservative level set method -Least square method -Unstructured meshes -Upwind plus flux limiter scheme -TVD Runge Kutta time
integration -Corbes de nivell, Mètodes de -Elements finits, Mètode dels -Flux bifàsic -- Simulació per ordinador |
Rights:
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Document type:
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Article - Published version Conference Object |
Published by:
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Budapest University of Technology and Economics
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