Resolution Effects and Local Averaging in Turbulence Simulations up to 4 Trillion...
Автор: NCSAatIllinois
Загружено: 2018-07-02
Просмотров: 172
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"Resolution Effects and Local Averaging in Turbulence Simulations up to 4 Trillion Grid Points" -- P.K Yeung, Georgia Institute of Technology
Petascale architectures such as Blue Waters have enabled turbulence simulations at extreme core counts and very high grid resolution, with a primary science driver being the study of intermittency at high Reynolds number. We take stock of these advances but also investigate the effects of resolution in both time and space, as well as aliasing errors which may affect quality of the numerical solution where localized events of high amplitude are concerned. In particular, it appears essential to minimize aliasing errors by using a time step smaller than previously thought, or (at greater cost) remove them entirely by truncating at a wavenumber cutoff lower than usually practiced. At the same time, statistics of dissipation rate averaged over domains of intermediate size in three-dimensional space are more robust, and have been led to new understanding. Challenges in maintenance of a petabyte-sized computational database are briefly addressed.
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