Efficient Time Integration of IMEX Type using Exponential Integrators for Compressible, Viscous Flow Simulation

Efficient Time Integration of IMEX Type using Exponential Integrators for Compressible, Viscous Flow Simulation
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使用指数积分器对 IMEX 类型进行高效时间积分,进行可压缩粘性流模拟

DOI:
10.1002/pamm.201610422
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发表时间:
2016
期刊:
PAMM
影响因子:
--
通讯作者:
Andreas Meister
Andreas Meister
中科院分区:
--
文献类型:
--
作者:
Veronika Straub;Sigrun Ortleb;Philipp Birken;Andreas Meister

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我们研究了最近开发的称为 EPIRK 的指数积分器在空间离散偏微分方程的所谓基于域的隐式显式 (IMEX) 设置中的适应性。 EPIRK 方案被证明可以有效解决足够刚性的问题,并在理论上提供高精度和良好的稳定性特性,例如 A 稳定性和 L 稳定性。然而,在实践中,我们可以证明这些稳定性属性取决于内部近似技术的参数。在这里,我们引入了 IMEX-EPIRK 方法,该方法包括将显式 Runge-Kutta 方案与 EPIRK 方案耦合。我们简要分析了它的线性稳定性,展示了它的守恒性质并建立了CFL条件。尽管该方法仅一阶收敛,但它很好地展示了这种新型方案对于刚性问题的优势。 (© 2016 Wiley‐VCH Verlag GmbH & Co. KGaA,魏因海姆)
We investigate the adaption of the recently developed exponential integrators called EPIRK in the so‐called domain‐based implicit‐explicit (IMEX) setting of spatially discretized PDE's. The EPIRK schemes were shown to be efficient for sufficiently stiff problems and offer high precision and good stability properties like A‐ and L‐stability in theory. In practice, however, we can show that these stability properties are dependent on the parameters of the interior approximation techniques.Here, we introduce the IMEX‐EPIRK method, which consists of coupling an explicit Runge‐Kutta scheme with an EPIRK scheme. We briefly analyze its linear stability, show its conservation property and set up a CFL condition. Though the method is convergent of only first order, it demonstrates the advantages of this novel type of schemes for stiff problems very well. (© 2016 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
一类新的 Runge-Kutta 型指数传播迭代方法 (EPIRK)
DOI: --
发表时间: 2011
影响因子: 4.1
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