What question did this study set out to answer?

To improve slip boundary modeling for nonequilibrium gas flows by developing a high-order half-flux method.

March 3, 2026AIAA Journal

High-Order Half-Flux Method for Slip Boundary Modeling

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This work proposes a high-order method to enhance slip boundary modeling in rarefied flows, suggesting improved accuracy in simulations.

To improve slip boundary modeling for nonequilibrium gas flows by developing a high-order half-flux method.
Revisiting the half-flux method for slip boundary conditions
Incorporating collision effects within the Knudsen layer
Distinguishing between velocity slip and temperature jump
Deriving conditions based on Maxwell and Cercignani–Lampis–Lord models
Applying the method within the Navier–Stokes–Fourier framework
Improved accuracy in slip boundary conditions
Enhanced agreement with molecular-level simulations
Successful modeling of a range of rarefied flows

Luan et al. (2026) studied this question.

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