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Cell-average based neural network method for time dependent partial differential equations

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Wednesday, October 6, 2021 1 pm to 2 pm

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Motivated by finite volume scheme, a cell-average based neural network method is proposed. The method is
based on the integral or weak formulation of partial differential equations. A simple feed forward network is forced to learn the solution average evolution between two neighboring time steps. Offline supervised training is carried out to obtain the optimal network parameter set, which uniquely identifies on finite volume like neural network method. Once well trained, the network method is implemented as an explicit finite volume scheme, thus is mech dependent. Different to traditional numerical methods, our method can be relieved from the explicit scheme CFL restriction and can adapt to any time step size for solution evolution. For second order and fourth PDEs, first order of convergence is observed and the errors are related to the spatial mesh size but are observed being independent of the mesh size in time. The cell-average based neural
network method can sharply evolve contact discontinuity with almost zero numerical diffusion introduced. Shock and rarefaction waves are well captured for nonlinear hyperbolic conversion laws. The method is further applied to solve kdV equations, and higher order PDEs.

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Meeting ID890 0228 5757
 
Password: 1015

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