Parallel direct numerical simulation and analysis of turbulent Rayleigh-Benard convection at moderate Rayleigh numbers using an efficient algorithm

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dc.contributor.authorYilmaz, Ilyas
dc.date.accessioned2024-07-18T20:42:31Z
dc.date.available2024-07-18T20:42:31Z
dc.date.issued2020
dc.departmentİstanbul Bilgi Üniversitesien_US
dc.description.abstractDirect numerical simulation of turbulent Rayleigh-Benard convection up to Rayleigh number 10(8) is performed using a fully-implicit, non-dissipative, discrete kinetic energy-conserving algorithm and a parallel flow solver based on it. The algorithm is especially suitable for simulating low-Mach number, variable density/viscosity, transitional and turbulent flows with or without heat transfer. Furthermore, since it does not rely on the Boussinesq assumption, large temperature differences and high Rayleigh numbers can be handled without loss of accuracy, unlike the pure incompressible ones. It is first shown that the algorithm is able to predict the evolution of thermally-driven instability to turbulent regime and all the characteristics of turbulent convection accurately, using low- and high-order turbulent statistics and various secondary diagnostics derived. Then, effects of increasing Rayleigh numbers on the development of the instability are analyzed in detail. Additionally, Nusselt-Rayleigh scaling properties are studied and a scaling relation is provided. Results show that Rayleigh-Benard convection at relatively high Rayleigh numbers, corresponding to a boundary layer-dominated regime and little beyond it to a bulk-dominated regime, is characterized by weakening thermal fluctuations, thinning thermal boundary layers, increasing vertical velocity fluctuations and decreasing skewness. It is also observed that the turbulent heat flux dominates the heat transfer. Finally, the corresponding Nusselt-Rayleigh scaling relation is predicted as Nu = 0.132Ra(0.297). (C) 2020 Elsevier Ltd. All rights reserved.en_US
dc.identifier.doi10.1016/j.compfluid.2020.104754
dc.identifier.issn0045-7930
dc.identifier.issn1879-0747
dc.identifier.scopus2-s2.0-85092256727en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.compfluid.2020.104754
dc.identifier.urihttps://hdl.handle.net/11411/7310
dc.identifier.volume213en_US
dc.identifier.wosWOS:000595147400022en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherPergamon-Elsevier Science Ltden_US
dc.relation.ispartofComputers & Fluidsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectDnsen_US
dc.subjectRayleigh-Benard Convectionen_US
dc.subjectRayleigh Numberen_US
dc.subjectNu-Ra Scalingen_US
dc.subjectParallel Solveren_US
dc.subjectLow-Mach Numberen_US
dc.subjectFlowen_US
dc.subjectTemperatureen_US
dc.subjectResolutionen_US
dc.subjectLayeren_US
dc.titleParallel direct numerical simulation and analysis of turbulent Rayleigh-Benard convection at moderate Rayleigh numbers using an efficient algorithmen_US
dc.typeArticleen_US

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