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arXiv · 2112.05834

A load balanced chemistry model with analytical Jacobian for faster reactive simulations in OpenFOAM

Bulut Tekgül·Heikki Kahila·Petteri Peltonen·Mahmoud Gadalla·Ossi Kaario·Ville Vuorinen
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Abstract

In this study, we introduce a novel open-source chemistry model for OpenFOAM to speed-up the reactive computational fluid dynamics (CFD) simulations using finite-rate chemistry. First, a dynamic load balancing model called DLBFoam is introduced to balance the chemistry load during runtime in parallel simulations. In addition, the solution of the cell-based chemistry problem is improved by utilizing an analytical Jacobian using an open-source library called pyJac and an efficient linear algebra library LAPACK. Combination of the aforementioned efforts yields a speed-up factor 200 for a high-fidelity large-eddy simulation spray combustion case compared to the standard OpenFOAM implementation. It is worth noting that the present implementation does not compromise the solution accuracy.

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Bulut Tekgül, Heikki Kahila, Petteri Peltonen, Mahmoud Gadalla, Ossi Kaario, Ville Vuorinen. 2021-12-10. A load balanced chemistry model with analytical Jacobian for faster reactive simulations in OpenFOAM. https://arxiv.org/abs/2112.05834

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