May I rewrite the Neumann boundary condition into a second-order derivative form?

[liangchun0206]

Hi @lululxvi . I really appreciate the DeepXDE. Here I have a question. Now I am deal with a biharmonic equation. Thus, I should give two kinds of boundary conditions, including Dirichlet and Neumann. However, I have read a paper the state if we change the Neumann boundary condition int a second-order derivative form, the rate of convergence will become faster. The conditions will be like u_xx=f and u_yy=g. So, is it possible to write a second-order derivative? If so, how can I implement it? Thanks a lot.

[lululxvi]

Use OperatorBC. See FAQ.