Base de données open-access à Johns Hopkins University
Dear colleague:
This email is to let you know about a novel on-line tool that may be useful
in your turbulence research. This is the recently completed open-access
Turbulence Database Cluster at Johns Hopkins University. It contains
27 Terabytes of data from a 10243 DNS of forced isotropic turbulence,
with 1024 time-steps stored, covering a large-scale turn-over time.
A Web services interface to the data permits numerical experiments
to be run across the Internet. We invite you to visit the site
http://turbulence.pha.jhu.edu
where the database and various methods to access it are explained in detail.
For example, you may run a program on your own computer that occasionally
requires the velocities, pressure, various gradients, etc., anywhere in the
10244 space-time domain (e.g. if you are tracking particles). These can be
obtained from a subroutine-like call from Fortran or C. You may download a
directory from the website that includes the required wrapper subroutines,
etc. Evaluation of velocity and pressure at arbitrary points and time is
supported using interpolations (up to 8th order) executed on the database
nodes. Spatial differentiation using various order approximations (up to
8th order) are also supported. Other functions such as spatial filtering
are being developed. Manual web-based access is also provided.
We hope the open availability of a "large" canonical turbulence dataset
will be useful to the research community, especially to our theoretical
colleagues. This database enables sophisticated numerical experiments
to be carried out on high-Reynolds-number turbulent flow data by anyone
with a laptop computer and an internet connection.
You are welcome to use the database in your turbulence research. If you do,
we would like to hear from you in order to be able to justify the continued
support of the database from the funding agencies. We also ask that you
cite the relevant publication (see
Y.
Li et al. (2008): A
public turbulence database cluster and applications to study Lagrangian
evolution of velocity increments in turbulence. Submitted for publication.
Preprint also available at the preprint server arXiv.org, at
href="http://arxiv.org/abs/0804.1703).
With best regards,
Charles Meneveau
Randal Burns
Shiyi Chen
Gregory Eyink
Alex Szalay
Johns Hopkins University
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