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). The
Acceleration of gravity is taken
From physics interface by default but could be overridden when
User defined is selected.
When the check box Include gravity is not selected in the Darcy’s Law interface Settings, the elevation
D is set equal to zero.
Select the check box Specify reference position to define a reference position for the gravity calculation.