Competition of overstability and stabilizing effects in viscoelastic thermovibrational flow

Attention is paid to a specific form of thermal convection which encompasses viscoelastic and thermovibrational effects in single problem or framework. The main objective understanding the relationship between phenomenon overstability periodic forcing through numerical solution governing equations their complete, time-dependent, nonlinear form. Fluid motion found for values control parameter one order magnitude smaller than threshold be exceeded equivalent Newtonian case. When disturbances saturate amplitude, patterns emerge that are reminiscent superlattice structures typical complex order. In present case, such peculiar modes driven by coexistence two distinct spatial scales, each displaying different temporal dependence, interplay time-varying (stabilizing destabilizing) acceleration induced vibrations ability fluid store release elastic energy.