HR: 1340h
AN: NG43A-0446    [Abstracts]
TI: A Flexible Turbulent Vector Field Generator
AU: BENASSI, A
EM: A.Benassi@opgc.univ-bpclermont.fr
AF: Albert Benassi, Laboratoire de M‚t‚orologie Physique (LaMP) OPGC, Universit‚ Blaise Pascal 24, avenue des Landais, AUBIERE CEDEX, 63177 France
AU: DAVIS, A
EM: adavis@lanl.gov
AF: Anthony B. Davis, Los Alamos National Laboratory (ISR-2) Mail: LANL (MS B-244) Bikini Atoll Road (Bld. 30), Los Alamos, 505 NM 87545 United States
AB: Analysis and generation of turbulent vector fields is a necessity in many areas, such as Atmospheric Science. A candidate model of vector field must be flexible enough to tune some features, such as the spacial distribution of vortices, sinks and sources, according to physical measures. To achieve that goal, we propose a model that depends upon a given matricial function called "topolet" and a law of random vectors family. This model has a hierarchical structure. Its spinal column is a tree: the encoding tree of the domain where the vector field lives. The sets of vortices, sinks and sources are driven by some Bernouilli subtrees, directly giving their fractal dimension. At each node of the tree is attached a rate of energy loose giving the spectral slope. All those quantities are independantly identifiable on the base of mathematical proofs. A primitive version of this model have been proposed for generating clouds.
DE: 3200 MATHEMATICAL GEOPHYSICS (New field)
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
DE: 3250 Fractals and multifractals
SC: Nonlinear Geophysics [NG]
MN: 2004 AGU Fall Meeting