From h to p efficiently: optimal implementation strategies for explicit time-dependent problems using the spectral/hp element method.
From h to p efficiently: optimal implementation strategies for explicit time-dependent problems using the spectral/hp element method.
复制标题
从H到P有效:使用Spectral/HP元素方法明确的时间依赖性问题的最佳实现策略。
DOI:
10.1002/fld.3909
复制
发表时间:
2014-07-20
影响因子:
1.8
通讯作者:
Sherwin, S. J.
中科院分区:
文献类型:
--
作者:
Bolis, A.;Cantwell, C. D.;Kirby, R. M.;Sherwin, S. J.
关键词:
We investigate the relative performance of a second-order Adams–Bashforth scheme and second-order and fourth-order Runge–Kutta schemes when time stepping a 2D linear advection problem discretised using a spectral/hp element technique for a range of different mesh sizes and polynomial orders. Numerical experiments explore the effects of short (two wavelengths) and long (32 wavelengths) time integration for sets of uniform and non-uniform meshes. The choice of time-integration scheme and discretisation together fixes a CFL limit that imposes a restriction on the maximum time step, which can be taken to ensure numerical stability. The number of steps, together with the order of the scheme, affects not only the runtime but also the accuracy of the solution. Through numerical experiments, we systematically highlight the relative effects of spatial resolution and choice of time integration on performance and provide general guidelines on how best to achieve the minimal execution time in order to obtain a prescribed solution accuracy. The significant role played by higher polynomial orders in reducing CPU time while preserving accuracy becomes more evident, especially for uniform meshes, compared with what has been typically considered when studying this type of problem.© 2014. The Authors. International Journal for Numerical Methods in Fluids published by John Wiley & Sons, Ltd.
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发表时间:
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影响因子:
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作者:
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发表时间:
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期刊:
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影响因子:
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作者:
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通讯作者:
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影响因子:
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