The Gravity node adds the gravity force vector to the right-hand side of the momentum equations;
ρcg for the continuous phase and
ρdg for the dispersed phase.
Enter the components of the Gravity vector,
g (SI unit: m/s
2). For 2D components the default Gravity vector is defined as
(0,-g_const). Here
g_const is a physical constant equal to 9.8066 m/s
2. For 3D and 2D axisymmetric components, the gravity acts in the negative
z direction by default.