CORIOLIS Rotating Platform France

Facility and equipment

Overview

The experiments are scheduled according to the requirements of the visitors and the occupation of the installation. A project typically requires one week for finalizing the set-up, and two to five weeks of experiments (five weeks total in average). At least one group member is asked to stay during the whole period of access for good co-ordination. At least two visitors are requested to be present at any time during the experiments, so that the data can be processed and checked without delay. Additional collaborators often come for shorter periods. Facilities for video conferencing and remote access of collaborators will be developed.

During the whole duration of access, the visitors have full control of the installation, get prompt help from at least one engineer, as well as from local scientists. After their experiments, user groups have free on-line access to the computer network or they get the data on a mobile disk, and can process their data from their home institution. They have also the possibility to come again for further processing and discussion of their results, within the limits of the available travel budget. User groups are of course encouraged to publish their results in conferences and international journals. Results are advertised on the website of the infrastructure, and will be presented in the Joint EuHIT User Meetings. The raw data are stored and preserved at the infrastructure. They are made publicly accessible in a web server after a two year period of exclusive access by the user group. Further improvement of data documentation and remote access procedures is presently developed within Hydralab IV, and it will be further improved within the JRA and networking activities of EuHIT.

Coriolis (Coriolis Rotating Platform)

The total weight of the platform is 150 tons and it supports an extra load of 150 tons. Its rotation period can be set with high stability between 10 and 1000 s. The tank can be filled with homogeneous or density stratified water. Stratification is made by filling the tank with a computer controlled mixture from two underground tanks with specified salinity and temperature. All the instruments, including lasers and computers, stay on the platform, where electricity, water and computer network are available, like in an ordinary laboratory. Researchers can stay on the platform during rotation.

Various devices can be used to produce turbulence, such as towed grids, a hydrodynamic loop, topography models to reproduce boundary layers and wakes in the natural environment. Thermal convection can be produced by heating with a 20 kW power generator. Particle Imaging Velocimetry (PIV) systems provide time resolved velocity fields in both horizontal and vertical planes of up to 3 m × 4 m in size, with a relative precision 2%. The laser sheet position can be scanned in a volume, providing three-dimensional three-component velocity fields, a quite unique feature for such large scale systems. Local probes are also available, like ultrasonic velocimeters, salinity and temperature sensors. Mechanical displacements and data acquisition are computer controlled. The installation is also quite appropriate to Lagrangian studies, using various flow tracers or particles.

Plik nie został znaleziony