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/s2). 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/s2. For 3D and 2D axisymmetric components, the gravity acts in the negative z direction by default.