Abstract
We present a stochastic sub grid scale modeling strategy currently under development for application in Finite Volume Large Eddy Simulation (LES) codes. Our concept is based on the integral conservation laws for mass, momentum and energy of a flow field that are universally valid for arbitrary control volumes. We model the space-time structure of the fluxes to create a discrete formulation. Advanced methods of time series analysis for the data-based construction of stochastic models with inherently non-stationary statistical properties and concepts of information theory for the model discrimination are used to construct stochastic surrogate models for the non-resolved fluctuations. Vector-valued auto-regressive models with external influences (VARX-models) form the basis for the modeling approach. The reconstruction capabilities of the modeling ansatz are tested against fully three dimensional turbulent channel flow data computed by direct numerical simulation (DNS). We present here the outcome of our reconstruction tests.
Dr. P. Metzner was formerly associated with the University of Lugano, Switzerland.
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Acknowledgments
The turbulent channel flow data were generated in the early 2000s in an extended DNS study by Markus Uhlmann at the Potsdam-Institute for Climate Impact Research within DFG-Project KL 611/10 using resources of the North-German Supercomputing Alliance (HLRN). Markus Uhlmann is now Professor at the Institute for Hydromechanics, Karlsruhe Institute of Technology, Germany. The processing of the channel flow data has been performed at HLRN, too. The study presented here has been funded by DFG, ref. no. KL 611/21.
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Larcher, T.v. et al. (2014). Towards a Stochastic Closure Approach for Large Eddy Simulation. In: Fuhrmann, J., Ohlberger, M., Rohde, C. (eds) Finite Volumes for Complex Applications VII-Elliptic, Parabolic and Hyperbolic Problems. Springer Proceedings in Mathematics & Statistics, vol 78. Springer, Cham. https://doi.org/10.1007/978-3-319-05591-6_89
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DOI: https://doi.org/10.1007/978-3-319-05591-6_89
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