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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v23.i2-4.60
pages 253-342

CFD MODELING OF FREE SURFACE FLOW WITH AND WITHOUT CONDENSATION

Dirk Lucas
Helmholtz-Zentrum Dresden-Rossendorf
Pierre Coste
CEA
T. Hohne
Helmholtz-Zentrum Dresden-Rossendorf (HZDR) - Institute of Fluid Dynamics P.O.Box 510119, D-01314 Dresden, Germanyy
D. Lakehal
ASCOMP GmbH, Technoparkstrasse 1, CH-8005 Zurich, Switzerland
Yann Bartosiewicz
Institute of Mechanics, Materials and Civil Engineering (iMMC), Universite Catholique de Louvain (UCL), 1348 Louvain-la-Neuve, Belgium

RESUMO

This paper presents some recent developments on CFD models suitable to simulate free surface flows, which so far have represented an unresolved matter for industrial nuclear reactors issues. While the general dynamics of such a large interface should be simulated in a CFD approach, all subgrid scale effects have to be modeled. Depending on choice of the general approach, i.e., one-fluid or multifluid models, different closures are required. The momentum transfer between the phases is usually reflected by a drag model in a two-fluid approach. The drag force depends on the local morphology (free surface or dispersed bubbles/drops) and has to be anisotropic at the free surface. Surface tension has to be considered at wavy surfaces. The situation becomes even more complex if mass transfer occurs at the interface. Three approaches with different detailedness are presented. Examples for CFD simulations for free surface flow using different CFD codes and approaches are discussed.

Palavras-chave: separated flow, free surface, CFD

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