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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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Entropic lattice Boltzmann method for multiphase flows: Fluid-solid interfaces.

Ali Mazloomi M¹, Shyam S Chikatamarla¹, Iliya V Karlin¹

¹Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 19, 2015

Summary

This summary is machine-generated.

The entropic lattice Boltzmann model (ELBM) now simulates dynamic fluid-solid interfaces. This thermodynamically stable model accurately captures contact line dynamics in applications like capillary filling and drop impact.

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Area of Science:

Multiphase flow dynamics
Computational fluid dynamics
Thermodynamics

Background:

The entropic lattice Boltzmann model (ELBM) is a recent advancement for multiphase flows.
Simulating dynamic fluid-solid interfaces requires robust and thermodynamically consistent models.
Existing models may face limitations in capturing complex interface phenomena.

Purpose of the Study:

To extend the entropic lattice Boltzmann model (ELBM) for dynamic fluid-solid interface simulations.
To investigate the dynamics of the contact line in various applications.
To validate the model's accuracy against analytical solutions and experimental observations.

Main Methods:

Extension of the entropic lattice Boltzmann model (ELBM).
Incorporation of a polynomial equation of state for thermodynamic consistency.
Numerical simulations of capillary filling and liquid drop impact scenarios.

Main Results:

The ELBM accurately reproduces the Young-Laplace law for static interface behavior.
Numerical results for capillary filling with wettability gradients match analytical solutions.
Simulations of drop impact quantitatively reproduce experimentally observed behaviors on different surfaces.

Conclusions:

The extended ELBM is a thermodynamically consistent and nonlinearly stable model for fluid-solid interface dynamics.
The model demonstrates a promising capability for studying complex phenomena like contact line motion.
This work provides a robust computational tool for a wide range of multiphase flow applications involving fluid-solid interactions.