Numerical simulation of incompressible two phase flows by conservative level set method
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hdl:2117/109210
Tipus de documentText en actes de congrés
Data publicació2012
EditorBudapest University of Technology and Economics
Condicions d'accésAccés restringit per política de l'editorial
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Abstract
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.
CitacióBalcazar, N., Jofre, L., Lehmkuhl, O., Rigola, J., Castro, J. Numerical simulation of incompressible two phase flows by conservative level set method. A: Conference on Modelling Fluid Flow. "Conference proceedings: Conference on Modelling Fluid Flow: CMFF'12: the 15th event of international conference series on fluid flow technologies held in Budapest". Budapest: Budapest University of Technology and Economics, 2012, p. 665-673.
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NUMERICAL SIMUL ... ATIVE LEVEL SET METHOD.pdf | 628,4Kb | Accés restringit |