The Gravity node is automatically added when
Include gravity is selected at interface level in the
Darcy’s Law settings and it is active in all domains in which the Darcy’s Law interface is applied.
The Global coordinate system is selected by default. The
Coordinate system list contains any additional coordinate systems that the model includes. It can be used when prescribing the direction of the gravitational forces.
When Acceleration is selected from the list, enter the components of the
Gravity vector g. The default value is
g_const which is the physical constant having the value
9.8066 m/s
2.
When Elevation is selected from the list, specify the
Elevation D (SI unit: m). Select the check box
Specify reference position to define a reference elevation.