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Development of a platform for analyses of ultra-scale direct numerical simulation data of turbulence

湍流超尺度直接数值模拟数据分析平台开发

基本信息

批准号：
15607011
负责人：
ISHIHARA Takashi
金额：
$ 2.3万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

We have performed ultra-scale direct numerical simulations(DNS) of incompressible homogeneous turbulence on the Earth Simulator. The number of grid points is up to 4096^3, the size of which is 64 as large as previous DNS. The attained Taylor micro-scale Reynolds number is as high as 1200. Since the ultra-scale DNS data of turbulence have a potential ability to elucidate high-Reynolds number turbulence, it is desirable to make the data public.In this research, for the purpose of developing a platform for analyses of the ultra-scale DNS data of turbulence, we have made the following studies :(1)We have released the fundamental characteristics as well as the results of various data-analyses of high-Reynolds number turbulence obtained by the ultra-scale DNS. The analyses include those of energy spectrum, pressure spectrum, enstrophy, and dissipation spectra, and the PDF and high-order moments of velocity derivatives in high Reynolds number turbulence. The findings are various new asymptotic properties of these quantities in high-Reynolds number turbulence.(2)We have developed general-purpose programs for the purpose of analyzing the ultra-scale DNS data of turbulence. The programs were written in FORTRAN and MPI. One can analyze the ultra-scale DNS data both on the ES and on the vpp5000/56 system of Information technology center at Nagoya University.(3)We have put the DNS data up to 1024^3 grid points on the Internet (one can download the data from the following URL : http://www.fluid.cse.nagoya-u.ac.jp/~dns/pub/dnsdata/dns.html). We have also made the 2048^3 DNS data available on Information technology center at Nagoya University.(4)We have succeeded on visualizing the ultra-scale turbulence field.(5)We have also performed a large-scale DNS of channel turbulence. The number of grid points is 1024x512x1024 and the attained friction Reynolds number Reτ is 1300.

我们在地球模拟器上对不可压缩均匀湍流进行了超尺度直接数值模拟（DNS）。网格点数量达到4096^3，其大小是之前DNS的64倍。获得的泰勒微尺度雷诺数高达1200。由于超尺度湍流DNS数据具有阐明高雷诺数湍流的潜在能力，因此将数据公开是可取的。本研究中，为了开发一个超尺度湍流DNS数据分析平台，我们进行了以下研究：（1）我们发布了基本的湍流DNS数据。特征以及超大规模 DNS 获得的高雷诺数湍流的各种数据分析结果。分析包括能谱、压力谱、熵和耗散谱，以及高雷诺数湍流中速度导数的 PDF 和高阶矩。这些发现是这些量在高雷诺数湍流中的各种新的渐近性质。(2)我们开发了通用程序，用于分析湍流的超大规模 DNS 数据。这些程序是用 FORTRAN 和 MPI 编写的。可以在ES和名古屋大学信息技术中心的vpp5000/56系统上分析超大规模的DNS数据。（3）我们将多达1024^3个网格点的DNS数据放在互联网上（可以从以下网址下载数据： http://www.fluid.cse.nagoya-u.ac.jp/~dns/pub/dnsdata/dns.html）。我们还在名古屋大学信息技术中心提供了2048^3 DNS数据。（4）我们成功地实现了超尺度湍流场的可视化。（5）我们还对通道湍流进行了大规模DNS分析。网格点数为1024x512x1024，获得的摩擦雷诺数Reτ为1300。