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Characterization of Thermal Transport in One-dimensional Solid Materials
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One-dimensional transient radiative transfer by lattice Boltzmann method.

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    The lattice Boltzmann method (LBM) effectively simulates transient radiative transfer in scattering media under laser irradiation. This advanced LBM approach accurately models complex scenarios, including inhomogeneous media and refractive index changes.

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    Area of Science:

    • Computational physics
    • Heat transfer
    • Optical engineering

    Background:

    • Accurate simulation of transient radiative transfer is crucial for understanding laser-matter interactions.
    • Existing methods may face challenges with scattering media, complex geometries, and time-dependent phenomena.
    • The lattice Boltzmann method (LBM) offers a promising alternative for solving complex transport equations.

    Purpose of the Study:

    • To extend the lattice Boltzmann method (LBM) for transient radiative transfer in scattering media.
    • To investigate the influence of medium properties and laser pulse characteristics on radiative signals.
    • To explore LBM's applicability to inhomogeneous media and refractive index discontinuities.

    Main Methods:

    • A fully implicit backward differencing scheme was employed to discretize the transient term in the radiative transfer equation.
    • A novel lattice structure was developed for the LBM implementation.
    • Validation was performed against literature data and Monte Carlo simulations for oblique incidence.

    Main Results:

    • The developed LBM algorithm demonstrates high accuracy and computational efficiency.
    • Medium properties (extinction coefficient, scattering albedo, anisotropy) and laser pulse shape significantly impact transmittance and reflectance.
    • The method successfully models transient radiative transfer in two-layer inhomogeneous media and at refractive index discontinuities.

    Conclusions:

    • The extended LBM is a robust and accurate tool for transient radiative transfer simulations in complex media.
    • The study provides valuable insights into the effects of various parameters on time-resolved radiative signals.
    • LBM shows significant potential for analyzing radiative transfer in diverse optical and thermal engineering applications.