Energetics of buoyancy-generated turbulent flows with active scalar: pure buoyant plume

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dc.contributor.authorChen, Chang Hsin
dc.contributor.authorBhaganagar, Kiran
dc.creator.orcidhttps://orcid.org/0000-0001-5205-4690en_US
dc.date.accessioned2023-08-07T16:13:00Z
dc.date.available2023-08-07T16:13:00Z
dc.date.issued2023-01-03
dc.description.abstractA framework for the budget of Reynolds stress, temperature and density variations, turbulent mass flux and turbulent heat flux is presented for buoyancy-generated turbulent flows with a focus on turbulent plumes. The dynamical interactions between the turbulence generated from the velocity and thermodynamic fluctuations in thermal and heated gas plumes is studied. A large-eddy simulation tool has been used to simulate heavier and lighter than air plumes released from a circular heated source for high Reynolds number (Re). The budget equations are developed using a Favre-averaging approach. Both heated air plumes and heated gas plumes, namely, heated SO2 and heated CH4 plumes, are included in the study. The study focuses on addressing key questions – does the turbulence kinetic energy (TKE) spectrum follow the classical inertial −5/3 spectrum or is there a −3 buoyancy regime with a different scaling law? Fundamental pathways for generation of turbulence through velocity fluctuations, and temperature and density fluctuations are discussed. Analysis of the TKE and scalar variance budget equations has demonstrated that multiple mechanisms dominate the transport of Reynolds stresses, and in particular that correlations between the density and the velocity dominates the turbulence production mechanisms. Entrainment is connected to the turbulent transport and pressure-dilation processes.en_US
dc.description.departmentMechanical Engineeringen_US
dc.description.sponsorshipNASA Center for Advanced Measurements in Extreme Environmentsen_US
dc.identifier.citationChen, C., & Bhaganagar, K. (2023). Energetics of buoyancy-generated turbulent flows with active scalar: Pure buoyant plume. Journal of Fluid Mechanics, 954, A23. doi:10.1017/jfm.2022.1011en_US
dc.identifier.issn1469-7645
dc.identifier.otherhttps://doi.org/10.1017/jfm.2022.1011
dc.identifier.urihttps://hdl.handle.net/20.500.12588/2012
dc.language.isoen_USen_US
dc.publisherCambridge University Pressen_US
dc.relation.ispartofseriesJournal of Fluid Mechanics;Volume 954
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.subjectplumes/thermalsen_US
dc.subjectturbulence simulationen_US
dc.subjectturbulent convectionen_US
dc.titleEnergetics of buoyancy-generated turbulent flows with active scalar: pure buoyant plumeen_US
dc.typeArticleen_US

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