DFN Model

[SourabhJadhav2]

PyBaMM Version

22.8

Python Version

3.9

Describe the bug

This is not a issue related to PyBaMM.
While developing DFN model, we use five governing equations - solid concentration, electrolyte concentration, solid potential, electrolyte potential, voltage equation.

While solving for solid concentration and electrolyte concentration, there is initial values for PDEs in parameter set.
But solving for solid potential and electrolyte potential, there is no initial values for ODEs in parameter set.
How you are doing in PyBaMM DFN model?
can you give some reference, please??

Steps to Reproduce

None

Relevant log output

No response

[SourabhJadhav2]

Anyone have idea?

[brosaplanella]

The potential equations do not have a time derivative, and therefore do not need an initial condition.

[YannickNoelStephanKuhn]

The potential equations are algebraic equations; think of them as constitutive relations if you're from a mechanics background.

If you want to understand their effects better, I recommend this article, which starts with a summary of the DFN and then derives the SPMe from it: https://arxiv.org/abs/1905.12553
I found it very helpful for my understanding, as the algebraic equations naturally substitute into the partial differential equations, showing their "constitutive" nature.

[SourabhJadhav2]

Yeah, got it.
Solved. Thank you.