浮点精度和内插方案对伪谱码turbulence的DNS结果的影响
Impact of the floating-point precision and interpolation scheme on the results of DNS of turbulence by pseudo-spectral codes
摘要：
本文研究了浮点精度和插值格式对伪谱湍流直接数值模拟结果的影响。三种不同类型的浮点精度配置在统计结果上没有差异。这意味着，由于所需的内存量减少，单精度计算允许增加雷诺数。用于获得粒子位置处的速度值的插值方案对拉格朗日加速度统计具有显著影响。一个三次计划的结果在一个稍微更广泛的加速度概率密度函数比三线性计划。此外，通过三次插值方案获得的缩放行为表现出的趋势，对一个稍微增加的程度的不稳定性相比，线性的。
英文摘要：
In this paper we investigate the impact of the floating-point precision and interpolation scheme on the results of direct numerical simulations (DNS) of turbulence by pseudo-spectral codes. Three different types of floating-point precision configurations show no differences in the statistical results. This implies that single precision computations allow for increased Reynolds numbers due to the reduced amount of memory needed. The interpolation scheme for obtaining velocity values at particle positions has a noticeable impact on the Lagrangian acceleration statistics. A tri-cubic scheme results in a slightly broader acceleration probability density function than a tri-linear scheme. Furthermore the scaling behavior obtained by the cubic interpolation scheme exhibits a tendency towards a slightly increased degree of intermittency compared to the linear one.
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