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.

我们已经对地球模拟器上不可压缩的均匀湍流进行了超规模的直接数值模拟（DNS）。网格点的数量最高为4096^3，其大小为64，与以前的DNS一样大。 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超规模DNS获得的高雷诺数湍流的各种数据 - 分析的结果。这些分析包括能量光谱，压力谱，腹部和耗散光谱的分析，以及高雷诺数中速度衍生物的PDF和高阶矩。这些发现是这些数量在高雷诺数湍流中的各种新的不对称特性。（2）我们开发了通用程序，目的是分析湍流的超规模DNS数据。这些程序是用Fortran和MPI编写的。人们可以在Nagoya University的ES和VPP5000/56信息技术中心系统上分析超规模的DNS数据。（3）我们将DNS数据最高为1024^3个网格点（可以从以下URL下载数据： http://www.fluid.cse.nagoya-u.ac.jp/~dns/pub/dnsdata/dns.html）。我们还使Nagoya University的信息技术中心获得了2048^3 DNS数据。（4）我们已经成功地可视化了超规模的湍流场。（5）我们还进行了大规模的通道湍流DNS。网格点的数量为1024x512x1024，所附的摩擦雷诺数reτ为1300。