Transition to the buoyancy-dominated regime in a planar temporal forced plume
We study the transition from the 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 describes the transition to the buoyancy-dominated regime which emerges at long times.
Authors
- G. Boga (ORCID: https://orcid.org/0000-0001-8965-960X)
- Enrico Stalio (ORCID: https://orcid.org/0000-0001-6983-4204)
- A. Cimarelli (ORCID: https://orcid.org/0000-0001-5165-9639)
- S. Musacchio (ORCID: https://orcid.org/0000-0002-4564-8527)
- Marco Crialesi-Esposito (ORCID: https://orcid.org/0000-0002-5983-9199)
- G. Boffetta (ORCID: https://orcid.org/0000-0002-2534-7751)
- Leonardo Puggioni (ORCID: https://orcid.org/0000-0003-3544-6240)
Institutions
- Leiden University (NL)
- University of Modena and Reggio Emilia (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- University of Turin (IT)
Publication Details
- Journal
- Journal of Fluid Mechanics
- Published
- 2025-01-10
- DOI
- https://doi.org/10.1017/jfm.2024.1237
- Primary Topic
- Aerodynamics and Acoustics in Jet Flows
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Fondazione CRT
- Università Degli Studi di Modena e Reggio Emila
- University of Cambridge