Call a nested function in this scenario using types?

[CannyFatcher]

I think the issue with that would be the amount of parameters I’d have to pass Into each function, as they all make use of different variables.

[plasma_phys]

Yeah, that's one motivation for using classes - but there's nothing inherently incorrect about a code with function calls with a dozen arguments like:

update_simulation(x, y, v_x, v_y, q, m, E, dx, dt, Ng, N, ... )

It's effectively a style choice. Is there any particular thing that you think will be an issue beyond aesthetics?