In the realm of turbulence modeling, machine learning techniques are increasingly utilized to construct closure models that represent the interaction between subgrid scales and resolved scales. The challenge lies in ensuring stability and abidance by physical laws such as conservation of energy, momentum, and mass. To address these issues, a novel approach is introduced that incorporates an additional set of equations to dynamically model the energy of subgrid scales. This method guarantees stability by conserving total energy through a skew-symmetric convolutional neural network architecture. The framework allows for backscatter modeling and extends to dissipative systems like viscous flows. By introducing SGS variables to approximate SGS energy projected onto a coarse grid, the closure model satisfies both momentum and kinetic energy conservation laws. The proposed methodology is applied to Burgers’ equation and Korteweg-de Vries equation in 1D, demonstrating superior stability properties compared to traditional approaches.
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arxiv.org
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