The Body Force creates a force to pull the fluid toward or away from a geometry object.
A positive Strength value produces a force that pulls fluid toward a geometry object, and can be used to make the fluid form the shape of the geometry; for example, making a liquid simulation form the shape of a letter, number, or logo for an interesting effect.
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Note that the force is pronounced outside the body, but the inside is replaced with a mechanism that suppresses the fluid's escape.
Meanwhile, negative Strength values repel the fluid away from the geometry object.
