Johns Hopkins Turbulence Databases
Welcome to the Johns Hopkins Turbulence Database (JHTDB) site
This website is a portal to an Open Numerical Turbulence Laboratory that enables access to multi-Terabyte turbulence databases. The data reside on several nodes and disks on our database cluster computers and are stored in small 3D subcubes. Positions are indexed using a Z-curve for efficient access.
Access to the data is facilitated by a Web services interface that permits numerical experiments to be run across the Internet. We offer C, Fortran and Matlab interfaces layered above Web services so that scientists can use familiar programming tools on their client platforms. Calls to fetch subsets of the data can be made directly from within a program being executed on the client's platform. Manual queries for data at individual points and times via web-browser are also supported. Evaluation of velocity and pressure at arbitrary points and time is supported using interpolations executed on the database nodes. Spatial differentiation using various order approximations (up to 8th order) and filtering are also supported (for details, see documentation page). Particle tracking can be performed both forward and backward in time using a second order accurate Runge-Kutta integration scheme. Subsets of the data can be downloaded in hdf5 file format using the data cutout service.
To date the Web-services-accessible databases contain a space-time history of a direct numerical simulation (DNS) of isotropic turbulent flow, in incompressible fluid in 3D, a DNS of the incompressible magneto-hydrodynamic (MHD) equations, a DNS of forced, fully developed turbulent channel flow, and a DNS of homogeneous buoyancy driven turbulence. The datasets comprise over 20 Terabytes for the isotropic turbulence data, 56 Terabytes for the MHD data, 130 Terabytes for the channel flow data and 27 Terabytes for the homogeneous buoyancy driven turbulence data. Basic characteristics of the data sets can be found in the datasets description page. Technical details about the database techniques used for this project are described in the publications.
The JHTDB project is funded by the US National Science Foundation .
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Please excuse our dust as we continue to develop this site. JHTDB is on-line but may periodcally be unavailable as we continue to add functionalities.