What is the frequency limit for Flux simulations?
Altair EmployeeIt is not easy to give a simple answer to that question. In fact, the frequency limit depends on the studied device: material properties (skin depth), dimensions of the device, operating principle, etc. All these criterions should be considered to know if the assumptions made in Flux simulations are valid or not (see explanations below). Typically, for devices not exceeding several centimeters the assumptions remain valid until 100MHz.
Maxwell-Ampere Equation:
In Flux Magnetic Transient or Steady State AC applications, Maxwell equations are solved in the Quasi-Static Approximation:
is neglected (displacement currents, propagation effects)
This assumption is valid if: 𝜔𝜀/𝜎 (typically until several 10s of MHz), where 𝜔 is the angular frequency in [rad/s], 𝜀 is the permittivity in [F/m] and 𝜎 is the electrical conductivity in [S/m].