flow360.Sutherland

class Sutherland

Bases: Flow360BaseModel

Represents Sutherland’s law for calculating dynamic viscosity. This class implements Sutherland’s formula to compute the dynamic viscosity of a gas as a function of temperature.

Example

>>> fl.Sutherland(
...     reference_viscosity=1.70138e-5 * fl.u.Pa * fl.u.s,
...     reference_temperature=300.0 * fl.u.K,
...     effective_temperature=110.4 * fl.u.K,
... )

---

reference_viscosity: Annotated[_Constrained, PlainSerializer(func=_dimensioned_type_serializer, return_type=PydanticUndefined, when_used=always)] [Required]

The reference dynamic viscosity at the reference temperature.

Constraints:

• func = <function _dimensioned_type_serializer at 0x79c44aad7130>

• return_type = PydanticUndefined

• when_used = always

reference_temperature: Annotated[_AbsoluteTemperatureType, PlainSerializer(func=_dimensioned_type_serializer, return_type=PydanticUndefined, when_used=always), AfterValidator(func=_check_temperature_is_physical)] [Required]

The reference temperature associated with the reference viscosity.

Constraints:

• func = <function _check_temperature_is_physical at 0x79c44aad76d0>

• return_type = PydanticUndefined

• when_used = always

effective_temperature: Annotated[_AbsoluteTemperatureType, PlainSerializer(func=_dimensioned_type_serializer, return_type=PydanticUndefined, when_used=always), AfterValidator(func=_check_temperature_is_physical)] [Required]

The effective temperature constant used in Sutherland’s formula.

Constraints:

• func = <function _check_temperature_is_physical at 0x79c44aad76d0>

• return_type = PydanticUndefined

• when_used = always

get_dynamic_viscosity(temperature)

Calculates the dynamic viscosity at a given temperature using Sutherland’s law.

Parameters:

temperature (AbsoluteTemperatureType) – The temperature at which to calculate the dynamic viscosity.

Returns:

The calculated dynamic viscosity at the specified temperature.

Return type:

ViscosityType.NonNegative