Abstract
Several kinds of explicit and implicit finite-difference schemes directly solving the discretized velocity distribution functions are designed with precision of different orders by analyzing the inner characteristics of the gas-kinetic numerical algorithm for Boltzmann model equation. The peculiar flow phenomena and mechanism from various flow regimes are revealed in the numerical simulations of the unsteady Sod shock-tube problems and the two-dimensional channel flows with different Knudsen numbers. The numerical remainder-effects of the difference schemes are investigated and analyzed based on the computed results. The ways of improving the computational efficiency of the gas-kinetic numerical method and the computing principles of difference discretization are discussed.
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Communicated by Zhe-wei ZHOU
Project supported by the National Natural Science Foundation of China (No. 10621062) and the Research Fund for Next Generation of General Armament Department (No. 9140A13050207KG29)
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Li, Zh., Bi, L. & Tang, Zg. Gas-kinetic numerical schemes for one- and two-dimensional inner flows. Appl. Math. Mech.-Engl. Ed. 30, 889–904 (2009). https://doi.org/10.1007/s10483-009-0708-x
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DOI: https://doi.org/10.1007/s10483-009-0708-x
Key words
- Boltzmann model equation
- gas-kinetic numerical schemes
- discrete velocity ordinate method
- shock-tube problems
- channel flows