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Title: Deep learning of interfacial curvature: A symmetry-preserving approach for the volume of fluid method
Authors: Asim Onder 
Liu, PLF 
Issue Date: 15-Jul-2023
Publisher: Elsevier BV
Citation: Asim Onder, Liu, PLF (2023-07-15). Deep learning of interfacial curvature: A symmetry-preserving approach for the volume of fluid method. Journal of Computational Physics 485 : 112110-112110. ScholarBank@NUS Repository.
Abstract: Estimation of interface curvature in surface-tension dominated flows is a remaining challenge in Volume of Fluid (VOF) methods. Data-driven methods are recently emerging as a promising alternative in this domain. They outperform conventional methods on coarser grids but diverge with grid refinement. Furthermore, unlike conventional methods, data-driven methods are sensitive to coordinate system and sign conventions, thus often fail to capture basic symmetry patterns in interfaces. The present work proposes a new data-driven strategy which conserves the symmetries in a cost-effective way and delivers consistent results over a wide range of grids. The method is based on artificial neural networks with deep multilayer perceptron (MLP) architecture which read volume fraction fields on regular grids. The anti-symmetries are preserved with no additional cost by employing a neural network model with input normalization, odd-symmetric activation functions and bias-free neurons. The symmetries are further conserved by height-function inspired rotations and averaging over several different orientations. The new symmetry-preserving MLP model is implemented into a flow solver (OpenFOAM) and tested against conventional schemes in the literature. It shows superior performance compared to its standard counterpart and has similar accuracy and convergence properties with the state-of-the-art conventional method despite using smaller stencil.
Source Title: Journal of Computational Physics
ISSN: 0021-9991
DOI: 10.1016/
Appears in Collections:Staff Publications

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