Development and Validation of a High-Order Fully-Implicit DNS/LES Algorithm for Transitional and Turbulent Buoyant Flows with Heat Transfer

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dc.contributor.authorYilmaz, Ilyas
dc.date.accessioned2024-07-18T20:40:04Z
dc.date.available2024-07-18T20:40:04Z
dc.date.issued2019
dc.departmentİstanbul Bilgi Üniversitesien_US
dc.description8th iTi Conference and Workshop on Turbulent Aspects in Wind Energy -- SEP 03-07, 2018 -- Bertinoro, ITALYen_US
dc.description.abstractA high-order, finite-volume algorithm specially designed for simulating low-Mach number, variable-density, buoyancy- and thermally-driven, transitional and turbulent flows with or without heat transfer is proposed. For this purpose, the fully-implicit, non-dissipative, discrete kinetic energy-conserving Direct Numerical Simulation (DNS) algorithm is combined with high-order, symmetric/central-differencing finite-volume approximations. The Wall-Adapting Local Eddy-viscosity (WALE) model is also utilized for subgrid-scale (SGS) modeling. To validate the proposed algorithm, two types of flows are considered; the turbulent Rayleigh-Benard Convection (RBC) and the Rayleigh-Taylor Instability (RTI). The selected problems include various mechanisms and multiple scales such as baroclinic vorticity, diffusion, mixing, interface interactions, density gradients, buoyancy and thermal forces. All those effects drive the flows into a transitional regime that eventually results in a relative turbulent state. As the first aim of this ongoing study, the proposed algorithm is successfully validated against the two challenging test cases. The results show its efficiency on coarse grids. Additionally, the wall-clock time of the computations are only 10-15% higher than the lower-order ones and unlike the many other high-order methods such as spectral, compact, WENO-type or DG, the proposed one is easy to implement into an existing code, relatively low-cost, robust, extendable to complex geometries and not seriously limited by flow physics or numerical constraints, due to inherently advanced properties of the base algorithm. The very small discrepancies observed near walls in RBC may point out that a more careful treatment of boundaries with walls might be required with the higher-order scheme.en_US
dc.description.sponsorshipiTien_US
dc.identifier.doi10.1007/978-3-030-22196-6_21
dc.identifier.endpage137en_US
dc.identifier.isbn978-3-030-22196-6
dc.identifier.isbn978-3-030-22195-9
dc.identifier.issn0930-8989
dc.identifier.issn1867-4941
dc.identifier.scopus2-s2.0-85072832433en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage131en_US
dc.identifier.urihttps://doi.org/10.1007/978-3-030-22196-6_21
dc.identifier.urihttps://hdl.handle.net/11411/6959
dc.identifier.volume226en_US
dc.identifier.wosWOS:000567879900021en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringer International Publishing Agen_US
dc.relation.ispartofProgress in Turbulence Viiien_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleDevelopment and Validation of a High-Order Fully-Implicit DNS/LES Algorithm for Transitional and Turbulent Buoyant Flows with Heat Transfer
dc.typeConference Object

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