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Towards stochastic subgrid-scale modeling of turbulent thermal convection in an under-resolved off-lattice Boltzmann method

  • A characteristic-based Off-Lattice Boltzmann Method (OLBM) and a stochastic One-Dimensional Turbulence (ODT) model is utilized for numerical simulation of turbulent thermal convection. Standalone ODT results for low-order statistics are compared with those from various eddy-viscosity-based subgrid-scale models utilized in Large-Eddy Simulations (LES) with OLBM. The predictive capabilities of both approaches are discussed by comparison with available reference Direct Numerical Simulation (DNS) results. All turbulence models are able to predicted the mean temperature, but fail to fully capture fluctuations. While the OLBM aims to represent large-scale structures, it misses some constitutional small-scale fluctuations. By contrast, the reduced-order ODT model captures small-scale fluctuations in the vicinity of the wall, but cannot resolve the organized bulk flow. Here, the modeling capabilities of both OLBM and ODT as standalone tools are discussed. On this basis, a strategy for the incorporation of ODT as wall model in OLBM isA characteristic-based Off-Lattice Boltzmann Method (OLBM) and a stochastic One-Dimensional Turbulence (ODT) model is utilized for numerical simulation of turbulent thermal convection. Standalone ODT results for low-order statistics are compared with those from various eddy-viscosity-based subgrid-scale models utilized in Large-Eddy Simulations (LES) with OLBM. The predictive capabilities of both approaches are discussed by comparison with available reference Direct Numerical Simulation (DNS) results. All turbulence models are able to predicted the mean temperature, but fail to fully capture fluctuations. While the OLBM aims to represent large-scale structures, it misses some constitutional small-scale fluctuations. By contrast, the reduced-order ODT model captures small-scale fluctuations in the vicinity of the wall, but cannot resolve the organized bulk flow. Here, the modeling capabilities of both OLBM and ODT as standalone tools are discussed. On this basis, a strategy for the incorporation of ODT as wall model in OLBM is suggested.show moreshow less

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Metadaten
Author: Sai Ravi Gupta PolasanapalliORCiD, Marten KleinORCiD, Heiko SchmidtORCiD
URL:https://onlinelibrary.wiley.com/doi/10.1002/pamm.202300223
DOI:https://doi.org/10.1002/pamm.202300223
ISSN:1617-7061
Title of the source (English):Proceedings in applied mathematics and mechanics : PAMM
Contributor(s): Roger Zoepke-Sonntag
Document Type:Conference publication peer-reviewed
Language:English
Year of publication:2023
Tag:heat transfer; lattice Boltzmann method; one-dimensional turbulence; thermal convection; turbulence modeling
First Page:1
Last Page:9
Article number:e202300223
Fundername (not EU):Bundesministerium für Bildung und Forschung
Project number (not EU):85056897; 03SF0693A
Way of publication:Open Access
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Numerische Strömungs- und Gasdynamik
Zentrale Einrichtungen / Energie-Innovationszentrum / Scientific Computing Lab
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