"Optional title"
##### Parameter definition
VariableDescription
options: X, Y, Z
cid ID of a CURVE or FUNCTION defining gravity coefficient versus time
options:
0 $\rightarrow$ include added mass
1 $\rightarrow$ exclude added mass
csysid Optional local coordinate system ID
##### Description

Note: A positive gravity constant results in body forces acting in the negative coordinate axis direction.

##### Example
###### Gravity

The following commands define a constant gravity in z-direction.