1Numerical simulation of compressible two phase flows
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58
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1Numerical simulation of compressible two-phase flows F. Petitpas SMASH Team - MARSEILLE
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- numerical simulation
- single velocity
- lagrangian eulerian
- multi-velocity flow
- front tracking
- evaporation front
- heavy numerical
F. Petitpas SMASH Team MARSEILLE
Flows zoology – Position of the topic
Compressibles
Single phase
Single velocity
• Interface problems resolution
• Twophase mixtures in mechanical equilibrium
Incompressibles
Multiphase
Multivelocity
• Non equilibrium twophase mixtures
• General models
• General models
2
Single velocity flows / Interface problems
Single contact interface
Media A
Media B
Μ
Evaporation front
Steam
Liquid
Detonation
Μ
3
Some words about discretisation scales
“Macro” scale : Multivelocity flow
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An averaged model with two velocities is needed
« Micro » scale : Single velocity flow
A reduced model for interface problems is enough
4
On the choice of the method
Sharp interface methods Lagrangian methods with moving meshes, ALE (Arbitrary Lagrangian Eulerian)Good for solid weak deformation
Front tracking, VOF, Level Set
Very impressive results
Generally non conservative regarding mass and energy
Heavy numerical treatment
Not adapted for fluids computation with extreme deformations
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