der(Dynamic Viscosity) computation for Dry Air Ideal Gas (inputs: T, rho, der(T), der(rho))
function derDynamicViscosity_derT_derrho input Units.SI.Temperature T "Temperature (K)"; input Units.SI.Density rho "Density (kg/m3)"; input Real der_T "Temperature time derivative (K/s)"; input Real der_rho "Density time derivative (kg/m3/s)"; output Real der_mu "Dynamic Viscosity time derivative (Pa)"; end derDynamicViscosity_derT_derrho;