Temperature-driven turbulence in compressible fluid flows
This work addresses fundamental turbulence dynamics in compressible fluids, offering theoretical and numerical insights that challenge existing conjectures, though it appears incremental in advancing known methods.
The authors tackled the long-time behavior of temperature-driven compressible fluid flows by proving convergence of discrete attractors to continuous ones and validating the ergodic hypothesis through numerical simulations, with results showing persistent non-zero Reynolds stress and Gaussian-type invariant measures.
We study the long-time behaviour of the temperature-driven compressible flows. We show that numerical solutions of a structure-preserving finite volume method generate a discrete attractor that consists of entire discrete trajectories. Further, we prove the convergence of discrete attractors to their continuous counterparts. Theoretical results are illustrated by extensive numerical simulations of the well-known Rayleigh-Benard problem. The numerical results also indicate the validity of the ergodic hypothesis and imply that a non-zero Reynolds stress persist for long time. Finally, we also observe that any invariant measure is of Gaussian type in sharp contrast with the conjecture proposed by [Glimm et al., SN Applied Sciences 2, 2160 (2020)].