Transition to the buoyancy dominated regime in a planar temporal forced plume
Abstract
We study the transition from momentum- to buoyancy-dominated regime in temporal jets forced by gravity. From the conservation of the thermal content and of the volume flux, we develop a simple model which is able to describe accurately the transition between the two regimes in terms of a single parameter representing the entrainment coefficient. Our analytical results are validated against a set of numerical simulations of temporal planar forced plumes at different initial values of Reynolds and Froude numbers. We find that, although the the pure jet-scaling law is not clearly observed in simulations at finite Froude number, the model correctly describe the transition to the buoyancy-dominated regime which emerges at long times.
Keywords
Cite
@article{arxiv.2508.02234,
title = {Transition to the buoyancy dominated regime in a planar temporal forced plume},
author = {G. Boga and A. Cimarelli and M. Crialesi Esposito and S. Musacchio and E. Stalio and G. Boffetta},
journal= {arXiv preprint arXiv:2508.02234},
year = {2025}
}
Comments
15 pages, 10 figures