Simulation and Analysis of Skin Effect using COMSOL

I need to model and perform analysis for simulating skin effect on the conductor or coil at various frequencies.
Below are the objective and analysis:
Frequency Dependence:
Objective: Demonstrate how the skin effect varies with frequency.
COMSOL Setup: Run simulations for a range of frequencies (e.g., 50 Hz, 1 kHz, 10 kHz, 100 kHz).
Analysis: Plot current density distribution and skin depth for each frequency.
Result: Show how the current density becomes more confined to the surface at higher frequencies.

Skin Depth Calculation:
Objective: Determine the skin depth at various frequencies.
COMSOL Setup: Extract the current density profile from simulations.
Analysis: Measure the distance from the surface where the current density drops to 1/e of its surface value.
Result: Compare simulated skin depths with theoretical calculations.

Current Distribution:
Objective: Visualize the current distribution within the conductor.
COMSOL Setup: Use surface and volume plots to show current density.
Analysis: Discuss how the distribution changes with frequency.
Result: Provide visual evidence of the skin effect and explain the observations.

AC vs. DC Resistance:
Objective: Compare AC resistance to DC resistance.
COMSOL Setup: Extract impedance from the simulation results.
Analysis: Separate the real part (resistive) of the impedance and compare it with DC resistance.
Result: Show how AC resistance increases with frequency and compare with theoretical values.