External noise in periodically forced Rayleigh-Bénard convection

OMAR OSENDA, CARLOS B. BRIOZZO, AND MANUEL O. CÁCERES

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

Año: 1996 vol. 54 p. 6944 - 6947

1063-651X

The effect of internal and external noise sources on the onset of Rayleigh-Bénard convection is studied for the case of time-periodic forcing. Internal noise is modeled through the inclusion of an additive white Gaussian noise field in the Swift-Hohenberg equation. External noise is modeled as multiplicate Gaussian noise. A comparison with available theoretical and experimental data is presented. We conclude that noise in the control parameter of the Swift-Hohenberg equation is not likely to explain the difference between the thermal noise intensity and the one needed to make theory fit the experiments.