Non-Ideal and Multi-Phase Flows

Multiphase flows are ubiquitous in nature, and successfully modeling their physics is critical to a wide range of disciplines.  

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For studying problems in diverse fields such as marine hydrodynamics, combustion, weather science, as well as countless biological and industrial processes, computational methods capable of handling multiple phases and evolving interfaces are essential. The lattice-Boltzmann method is used as a framework for the development of broadly applicable multiphase methods that directly resolve the thermodynamics of the interface, in contrast to well known interface tracking methods such as volume of fluid (VOF).

By discarding the ideal-gas assumption of many computational fluid dynamics methods and incorporating more complex, non-ideal thermodynamics, multiple phases and their interfaces arise naturally from the prescribed thermodynamic conditions. This additional physical consistency offers benefits for modeling flows with dramatically varying thermodynamic regimes, such as those found inside internal combustion and rocket engines, or flows where the nature of the interface itself may be of interest, such as in problems of bubble nucleation or cavitation.

These methods are now well-established for the simulation of isothermal, low-speed flows with two phases and have been successfully used to investigate the behavior of bouncing droplets.

A major focus of the group is expanding these methods to incorporate the more diverse physics of multispecies, thermal, and compressible flows in order to fully realize their potential.

 

Related Publications

Entropic lattice Boltzmann method for multiphase flows
Mazloomi M A, Chikatamarla SS, Karlin IV.
Physical review letters. 2015 May;114(17):174502.
Research Collection 

Towards a consistent lattice Boltzmann model for two-phase fluids
Hosseini SA, Dorschner B, Karlin IV.
Journal of Fluid Mechanics. 2022 Dec;953:A4.
Research Collection  |  external page https://doi.org/10.1017/jfm.2022.867

Lattice Boltzmann for non-ideal fluids: Fundamentals and Practice

Hosseini SA, Karlin IV.
arXiv preprint arXiv:2301.02011. 2023 Jan 5.
external page arXiv   

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