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arXiv 2402.09252math.NAcs.NA
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非理想气体Euler方程的渐近保持IMEX格式

Asymptotic-preserving IMEX schemes for the Euler equations of non-ideal gases

Giuseppe Orlando, Luca Bonaventura

AI总结:

针对非理想气体可压缩Euler方程,提出并分析了通用IMEX时间离散格式,证明其低马赫数极限下的渐近保持特性,耦合DG空间离散后得到宽马赫数适用的数值方法,经基准测试验证有效。

摘要:

我们分析了基于通用隐式-显式(Implicit-Explicit, IMEX)时间离散的气体动力学可压缩Euler方程格式,证明其在低马赫数极限下具有渐近保持(asymptotic-preserving, AP)特性。该分析针对通用状态方程(equation of state, EOS)展开,同时考虑了单渐近长度尺度和双长度尺度两种情况。随后我们证明,将这些时间离散方法与采用合适通量的间断伽辽金(Discontinuous Galerkin, DG)空间离散耦合后,可得到适用于宽马赫数范围的数值方法。多个理想气体基准测试及其向非理想EOS的非平凡扩展验证了上述分析的正确性。

英文摘要:

We analyze schemes based on a general Implicit-Explicit (IMEX) time discretization for the compressible Euler equations of gas dynamics, showing that they are asymptotic-preserving (AP) in the low Mach number limit. The analysis is carried out for a general equation of state (EOS). We consider both a single asymptotic length scale and two length scales. We then show that, when coupling these time discretizations with a Discontinuous Galerkin (DG) space discretization with appropriate fluxes, a numerical method effective for a wide range of Mach numbers is obtained. A number of benchmarks for ideal gases and their non-trivial extension to non-ideal EOS validate the performed analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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