Gravity
The Gravity node adds the acceleration of gravity to the simulation model.
Shell Properties
The settings are the same as for the Shell Properties section of the Richards’ Equation Model node.
Coordinate System Selection
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.
Gravity
Specify either the acceleration vector or — in case you have a Subsurface Flow Module license — the elevation.
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/s2.
When Elevation is selected from the list, specify the Elevation D (SI unit: m). Select the checkbox Specify reference position to define a reference elevation.