For 2D components, gravity acts in the negative y direction by default. For example, in a 2D component, the y component is -g_const and the other component is 0. In this setting, g_const is a predefined physical constant for the standard gravity (acceleration due to gravity at sea level).
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For 3D and 2D axisymmetric components, gravity acts in the negative z direction by default. For example, in a 3D component, the z component is -g_const and the other components are 0. In this setting, g_const is a predefined physical constant for the standard gravity (acceleration due to gravity at sea level).
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