The Fluid Properties node adds the momentum equations solved by the physics interface, except for volume forces which are added by the Volume Force node. The node also provides an interface for defining the physical properties of the fluid.

Select a Fluid model — Linear elastic (the default).

The default Density ρ (SI unit: kg/m3) uses the value From material. For User defined enter a different value or expression.

The default Dynamic viscosity μ (SI unit: Pa·s) uses the value From material and describes the relationship between the shear rate and the shear stresses in a fluid. Intuitively, water and air have a low viscosity, and substances often described as thick (such as oil) have a higher viscosity.

The default Speed of sound cs (SI unit: m/s) uses the value From material. For User defined enter a different value or expression.