INVESTIGADORES
ELASKAR sergio Amado
congresos y reuniones científicas
Título:
NEW FORMULATION FOR CHAOTIC INTERMITTENCY WITHOUT NOISE
Autor/es:
ELASKAR, SERGIO; DEL RIO, EZEQUIEL; KRAUSE, GUSTAVO
Lugar:
San Carlos de Bariloche
Reunión:
Congreso; ENIEF 2014; 2014
Institución organizadora:
Asociación Argentina de Mecánica Computacional e Inst. Balseiro
Resumen:
The proper description of turbulent flows presents difficulty for researchers in fluid mechan-ics. One feature of some of these flows is intermittency. The intermittency phenomenon in ChaoticDynamics theory is understood as a specific route to the deterministic chaos when spontaneous transi-tions between laminar and chaotic dynamics occur. A correct characterization of the intermittency isimportant, principally, to study those problems having partially unknown governing equations or thereare experimental or numerical data series. This paper presents a review of a new methodology to inves-tigate systems showing chaotic intermittency phenomenon without noise is presented. To evaluate thestatistical properties of the chaotic intermittency a theoretical RPD is obtained. This function depends ontwo parameters, the lower bound of reinjection and an exponent which describes the non-linear reinjec-tion processes. Once evaluated the RPD function, other properties such as the probability of the laminarlength and the characteristic relation are obtained. The key of the new formulation is the introductionof a new function, called M(x), which is utilized to calculate the RPD function in place to consider thehuge number of numerical or experimental data. The function M(x) depends on two integrals, this char-acteristic reduces the influence on the statistical fluctuations in the data series. Also, the function M(x)is easy to evaluate. With this new approach, more accurate analytical expressions for the intermittencystatistical properties are obtained. And, it is shown that the behavior of the intermittency phenomena ismore rich and complex that those given by the classical theory used until now. On the other hand, the newanalytical RPD function is more general than the previous ones; and the classical uniform reinjection isonly a particular case.