### Numerical Jacobian

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I have a nonlinear PDE where the source term is a nonlinear function of u. However, this function is not known analytically. I just have the numerical value of the function and its derivative for a given u. I looked into Nonlinear Poisson example, but it is not clear to me if it is possible to solve the non-linear PDE in fenics, if the source term was known only numerically for a given u.
It should still be possible to assemble the source term into a right hand side vector, if for example your source function is available in the form of nodal values. But for details you should elaborate a little more on your problem.

Community: FEniCS Project

written
4 months ago by
klunkean

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