Setting Material Properties

Set the material properties for air.

The dynamic viscosity for air is calculated as:

μ = ρ u L Re

where the velocity u = 291.68 m/s, the chord length L = 0.64607 m, and the Reynolds number Re = 11.72E6. The density ρ has a value of 1.177 kg/m^2 and is calculated according to the ideal gas law:

ρ = P R T

where the pressure P = 101325 Pa, the specific gas constant for air R = 287.058 J/kg-K, and the temperature T = 300 K.

The thermal conductivity for air is calculated as:

λ = c p μ Pr

where the specific heat is c p = 1003.62 J/kg-K and the Prandtl number for air is Pr = 0.72.

To specify the resulting values of 1.8918E-5 Pa-s for the dynamic viscosity and 0.0263980 W/m-K for the thermal conductivity:

  1. Expand the Continua > Fluid > Models > Gas > Air > Material Properties node and set the following properties:
    Node Property Setting
    Dynamic Viscosity Method Constant
    Constant Value 1.8918E-5 Pa-s
    Thermal Conductivity Method Constant
    Constant Value 0.0263980 W/m-K
  2. Save the simulation.