scholarly journals Phase-field model for a weakly compressible soft layered material: morphological transitions on smectic-isotropic interfaces

Soft Matter ◽  
2021 ◽  
Author(s):  
Eduardo Vitral ◽  
Perry H. Leo ◽  
Jorge Viñals
Keyword(s):  
Phase Field ◽  
Hydrodynamic Model ◽  
Field Model ◽  
Phase Field Model ◽  
Layered Material ◽  
Two Phase ◽  
Weakly Compressible ◽  
Morphological Transitions ◽  
Isotropic Fluid

A coupled phase-field and hydrodynamic model is introduced to describe a two-phase, weakly compressible smectic (layered phase) in contact with an isotropic fluid of different density. A non-conserved smectic order...

scholarly journals A Numerical Study on Stratified Shear Layers With Relevance to Oil-Boom Failure

2014 ◽  
Author(s):  
David Kristiansen ◽  
Odd M. Faltinsen
Keyword(s):  
Numerical Model ◽  
Phase Field ◽  
Field Model ◽  
Numerical Study ◽  
Phase Field Model ◽  
Processing Unit ◽  
Stable Model ◽  
Interface Instability ◽  
Two Phase ◽  
Oil Boom

Interface dynamics of two-phase flow, with relevance for leakage of oil retained by mechanical oil barriers, is studied by means of a 2D lattice-Boltzmann method combined with a phase-field model for interface capturing. A Multi-Relaxation-Time (MRT) model of the collision process is used to obtain a numerically stable model at high Reynolds-number flow. In the phase-field model, the interface is given a finite but small thickness where the fluid properties vary continuosly across a thin interface layer. Surface tension is modelled as a volume force in the transition layer. The numerical model is implemented for simulations with the graphic processing unit (GPU) of a desktop PC. Verification tests of the model are presented. The model is then applied to simulate gravity currents (GC) obtained from a lock-exchange configuration, using fluid parameters relevant for those of oil and water. Interface instability phenomena are observed, and obtained numerical results are in good agreement with theory. This work demonstrates that the numerical model presented can be used as a numerical tool for studies of stratified shear flows with relevance to oil-boom failure.

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