For some applications it is important to take buoyancy effects into account. When you simulate a moving pipe with 2-phase fluid in a gravitational field something like in our use case should happen: Separation of phases. The liquid fraction moves down, and the gaseous phase moves up. This is quite important to know if heat transfer needs to be calculated correctly over a discretized pipe or component (e.g. heat exchangers or electrolysers). Moreover, natural convection can be simulated in closed circuits or mobile components, that move in space.

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