Can you please help regarding how to solve couples system of equation in Freefem++ like Cahn-Hilliard equation involving non-linear terms. I have tried but showing error.
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Hello @Monirul25 
As per my knowleadge to solve a coupled system of equations like the Cahn-Hilliard equation involving non-linear terms in FreeFEM++:
Here are a some steps and considerations to help you resolve the error.
- You can Double check the syntax of your FreeFEM++ script for any errors.
- You can Use an appropriate non-linear solver like newton, picard, or broyden.
- Ensure your boundary conditions are correctly defined.
- Verify your initial conditions match the problem setup.
- Review error messages for clues.
- Consult the FreeFEM++ documentation and relevant examples for guidance.
Hope this will help you 
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