Flow conservation constraint

[gdalle]

Hi @Takashy! In order to make it easier to help you, please read the advice below. In particular, a reproducible chunk of code would help clarify your problem and look for solutions!

Please read: make it easier to help you

Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …