Complex-ordered patterns in shaken convection.

摘要: We report and analyze complex patterns observed in a combination of two standard pattern forming experiments. These exotic states are composed distinct spatial scales, each displaying different temporal dependence. The system is fluid layer experiencing forcing from both vertical temperature difference time-periodic oscillations. Depending on the parameters these mechanisms produce motion with either harmonic or subharmonic response. Over parameter range where have comparable influence scales associated responses found to coexist, resulting complex, yet highly ordered patterns. Phase diagrams this region reported criteria define as quasiperiodic crystals superlattices presented. satisfy four-mode (resonant tetrad) conditions. qualitative between present formation mechanism resonant triads ubiquitously used explain complex-ordered other nonequilibrium systems discussed. only exception quantitative agreement our analysis based Boussinesq equations laboratory investigations be result breaking symmetry small near onset.