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Nonuniversal transition to condensate formation in two-dimensional turbulence

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arxiv 1911.11315 v1 pith:JRF2G653 submitted 2019-11-26 physics.flu-dyn nlin.CD

Nonuniversal transition to condensate formation in two-dimensional turbulence

classification physics.flu-dyn nlin.CD
keywords transitioncondensateformationturbulencetwo-dimensionalcriticalforcingnonuniversal
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The occurrence of system-scale coherent structures, so-called condensates, is a well-known phenomenon in two-dimensional turbulence. Here, the transition to condensate formation is investigated as a function of the magnitude of the force and for different types of forcing. Random forces with constant mean energy input lead to a supercritical transition, while forcing through a small-scale linear instability results in a subcritical transition with bistability and hysteresis. That is, the transition to condensate formation in two-dimensional turbulence is nonuniversal. For the supercritical case we quantify the effect of large-scale friction on the value of the critical exponent and the location of the critical point.

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