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.…
Author: | Sai Ravi Gupta PolasanapalliORCiD, Marten KleinORCiD, Heiko SchmidtORCiD |
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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 |