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arXiv · 2607.12218

A Log-Gaussian Scale-Space Limiter for Hybrid Continuum--Ballistic Gas Dynamics

Bjørn Wu
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Abstract

We propose a log-Gaussian scale-space limiter for hybrid continuum--ballistic gas dynamics. The method defines complementary continuum and ballistic weights as Gaussian cumulative probabilities in logarithmic Knudsen-number space and blends Navier--Stokes--Fourier and half-range Maxwellian kinetic fluxes. The method is formulated as a lightweight hybrid closure intended for future implementation in finite-volume, discrete Boltzmann, or gas-kinetic solvers. Reduced one-dimensional closure/profile comparisons against DVM/BGK Fourier and Couette data show that log-Gaussian weighting of NSF and jump/slip-corrected branches improves the tested macroscopic profiles relative to NSF. The same six DVM/BGK profiles are used both as reference profiles and to calibrate K0 and sigma; therefore, the approximately 40 percent reduction in combined mean profile error is an in-sample calibration result for the reduced profile model rather than independent validation or numerical validation of the proposed finite-volume face flux. Additional diagnostics assess non-equilibrium moments, internal parameter robustness, and shock-layer activation.

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Bjørn Wu. 2026-07-13. A Log-Gaussian Scale-Space Limiter for Hybrid Continuum--Ballistic Gas Dynamics. https://doi.org/10.1515/ot-2026-0023

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