Abstract
In this work we present a data driven method, used to improve mode-based model order reduction of transport fields with sharp fronts. We assume that the original flow field q(x, t) = f(ϕ(x, t)) can be reconstructed by a front shape function f and a level set function ϕ. The level set function is used to generate a local coordinate, which parametrizes the distance to the front. In this way, we are able to embed the local 1D description of the front for complex 2D front dynamics with merging or splitting fronts, while seeking a low rank description of ϕ. Here, the freedom of choosing ϕ far away from the front can be used to find a low rank description of ϕ which accelerates the convergence of \(\left \Vert q- f(\phi _n) \right \Vert \), when truncating ϕ after the nth mode. We demonstrate the ability of this new ansatz for a 2D propagating flame with a moving front.
The author “Julius Reiss” is the Speaker.
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Note that for simplicity we will also use \(\left \Vert \alpha -\tilde {\alpha } \right \Vert { }_2\) for scalar functions \(\alpha :\mathcal {V}\to \mathbb {R}\). which we actually calculate as \(\left \Vert X^\alpha -X^{\tilde {\alpha }} \right \Vert { }_2\).
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Acknowledgements
This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—384950143/ GRK2433 and Project 200291049—SFB 1029.
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Krah, P., Sroka, M., Reiss, J. (2021). Model Order Reduction of Combustion Processes with Complex Front Dynamics. In: Vermolen, F.J., Vuik, C. (eds) Numerical Mathematics and Advanced Applications ENUMATH 2019. Lecture Notes in Computational Science and Engineering, vol 139. Springer, Cham. https://doi.org/10.1007/978-3-030-55874-1_79
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DOI: https://doi.org/10.1007/978-3-030-55874-1_79
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