Ambient Value Setting

Setting Item

Note

[Analyze using the material properties depending on ambient values] option

If selected, ambient temperature and ambient pressure can be set in the fluid analysis, and ambient pressure can be set in the fluid-thermal analysis.

Material: Gas

・Using the set values, calculate the density by the ideal gas law (see the density tab), thus reproducing the analysis under a high-temperature or reduced-pressure environment.

・When the [Temperature-Viscosity] table is enabled, a temperature-dependent viscosity is used.

・In the fluid analysis only, the ambient temperature is used for the calculation of material properties, and in the thermal-fluid analysis, the temperature at each point is used.

In the fluid-thermal analysis, if selected, the density is always calculated by the equation of state.

Material: Liquid

・When the [Temperature-Density] table is enabled, a temperature-dependent density is used.

・When the [Temperature-Viscosity] table is enabled, a temperature-dependent viscosity is used.

In the thermal-fluid analysis, for both gas and liquid:

・When the [Temperature-Thermal Conductivity] table is enabled, a temperature-dependent thermal conductivity is used.

・When the [Temperature-Specific Heat] table is enabled, a temperature-dependent specific heat is used.

• When calculating in the reduced pressure environment, calculate the Knudsen number to verify that the body is a continuum.
  

• Pressure-reducing process cannot be calculated because of the assumed non-compressive fluid.