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dc.contributor.authorBhattacharya, Shashwat
dc.contributor.authorSamtaney, Ravi
dc.contributor.authorVerma, Mahendra K.
dc.date.accessioned2019-07-25T13:01:13Z
dc.date.available2019-07-25T13:01:13Z
dc.date.issued2019-07-16
dc.identifier.citationBhattacharya, S., Samtaney, R., & Verma, M. K. (2019). Scaling and spatial intermittency of thermal dissipation in turbulent convection. Physics of Fluids, 31(7), 075104. doi:10.1063/1.5098073
dc.identifier.doi10.1063/1.5098073
dc.identifier.urihttp://hdl.handle.net/10754/656183
dc.description.abstractWe derive scaling relations for the thermal dissipation rate in the bulk and in the boundary layers for moderate and large Prandtl number (Pr) convection. Using direct numerical simulations of Rayleigh-Bénard convection, we show that the thermal dissipation in the bulk is suppressed compared to passive scalar dissipation. The suppression is stronger for large Pr. We further show that the dissipation in the boundary layers dominates that in the bulk for both moderate and large Pr. The probability distribution functions of thermal dissipation rate, both in the bulk and in the boundary layers, are stretched exponential, similar to passive scalar dissipation.
dc.description.sponsorshipWe thank A. Pandey, A. Guha, and R. Samuel for useful discussions. Our numerical simulations were performed on Shaheen II at Kaust Supercomputing Laboratory, Saudi Arabia, under the Project No. k1052. This work was supported by the research Grant No. PLANEX/PHY/2015239 from Indian Space Research Organisation, India, and by the Department of Science and Technology, India (Grant No. INT/RUS/RSF/P-03), and the Russian Science Foundation, Russia (Grant No. RSF-16-41-02012), for the Indo-Russian project.
dc.publisherAIP Publishing
dc.relation.urlhttp://aip.scitation.org/doi/10.1063/1.5098073
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Physics of Fluids and may be found at http://doi.org/10.1063/1.5098073.
dc.titleScaling and spatial intermittency of thermal dissipation in turbulent convection
dc.typeArticle
dc.contributor.departmentFluid and Plasma Simulation Group (FPS)
dc.contributor.departmentMechanical Engineering
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalPhysics of Fluids
dc.rights.embargodate2020-07-16
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
dc.contributor.institutionDepartment of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
dc.identifier.arxivid1904.03457
kaust.personSamtaney, Ravi
kaust.grant.numberProject No. k1052
refterms.dateFOA2019-07-25T13:29:01Z
kaust.acknowledged.supportUnitSupercomputing Laboratory
dc.date.published-online2019-07-16
dc.date.published-print2019-07
dc.date.posted2019-04-06


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