Request for Guidance on Current and Impedance Calculation in EPB + Petri Dish Model

[lorenero_99]

I am currently working on an Electro Quasi Static simulation in Sim4Life Lite, where I am modeling an Electrode Planar Biocompatible (EPB) device placed inside a Petri dish filled with conductive solution.
The geometry is structured as follows:

Petri Dish: cylindrical container filled with conductive solution.

Solution: conductive medium fully filling the dish.

Substrate: a thin planar silicone layer (3.5 mm x 2.5 mm x 0.1 mm) placed inside the solution.

Electrodes: two rectangular metallic electrodes (1.2 mm x 2 mm x 0.01 mm) embedded on the planar substrate, oriented towards the lesion area.
The electrodes are physically placed on the substrate and are not suspended in air.

Configuration Variants:

The EPB is placed on the bottom of the Petri dish (electrodes in contact with the bottom).

The EPB is suspended in the solution (electrodes fully surrounded by the medium).

I have already successfully run the simulations and obtained the electric field and potential distributions.
In setting up the simulation, I used Extracted Faces by selecting the top faces of the electrodes and dragging them into the boundary conditions, instead of dragging the entire electrode object.

However, I would like to know:

How can I calculate the total current absorbed by the electrodes in each of the two configurations (on the bottom vs. suspended)?

How can I compute the impedance of the electrodes in these scenarios using Sim4Life Lite?

Are there specific post-processing tools or port definitions that I should use?

Do I need to set up additional boundary conditions or use a particular solver output?

[AntoninoMC]

Dear @lorenero_99,
Thank you for contacting us! Please have a read to my recent comment to this post, where I tried to be very detail in explaining how the current flux normalization works and what are the limitations.

https://forum.zmt.swiss/topic/733/normalization-for-precise-current-control-via-jupyter/5

For what concerns the impedance, if you use the Ohmic-Current Dominated solver, the Ohmic laws apply and you can extract the resistance (impedance) knowing the applied voltages at the electrodes and the current through them.

If you need further explanations, please do not hesitate to contact us immediately!

All the best,
Antonino