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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Diffuse-interface model for smoothed particle hydrodynamics.

Zhijie Xu1, Paul Meakin, Alexandre M Tartakovsky

  • 1Center for Advanced Modeling and Simulation, Idaho National Laboratory, Idaho Falls, Idaho 83415, USA. zhijie.xu@inl.gov

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel smoothed particle hydrodynamics (SPH) model for simulating two-phase fluids using diffuse-interface theory. The model simplifies interface tracking by allowing a finite interface thickness, enhancing simulations of complex fluid dynamics.

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Area of Science:

  • Computational physics
  • Materials science
  • Fluid dynamics

Background:

  • Diffuse-interface theory is crucial for modeling microstructure evolution and dynamic interfaces in materials.
  • Smoothed particle hydrodynamics (SPH) is effective for simulating large deformations and complex boundaries in fluids and solids without explicit interface tracking.

Purpose of the Study:

  • To develop a smoothed particle hydrodynamics (SPH) model for single-component two-phase fluids grounded in diffuse-interface theory.
  • To eliminate the need for explicit interface location and curvature computation in fluid simulations.

Main Methods:

  • Developed an SPH model incorporating diffuse-interface theory for two-phase fluids.
  • The model defines interfaces with finite thickness and surface tension dependent on free energy functional coefficients.
  • Validated the model using one- and two-dimensional SPH simulations.

Main Results:

  • The SPH model successfully simulates two-phase fluids based on diffuse-interface theory.
  • Interface properties like thickness and surface tension are determined by the gradient and homogeneous free energy contributions.
  • The model avoids explicit surface localization and curvature calculations.

Conclusions:

  • The developed SPH model offers a robust and simplified approach for simulating two-phase fluid dynamics with diffuse interfaces.
  • This method enhances the simulation of materials undergoing dynamic interface evolution, fragmentation, and coalescence.