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Re: Undesired condensation in multicomponent flows


Dear Max,

Thanks for your reply. When I say condensation I was actually meaning the precipitation of one fluid in the other fluid. The setup is that fluid 1 is being injected from the left end, displacing fluid 2. (rectangle geometry, constant pressure at right end, bounceback at top and bottom, BouncbackRho1=0.7, BouncebackRho2=0.3). When I increase G from 3 to 4, after the start of the simulation, though most of fluid 1 is still in the left region, I see some little bubbles of fluid 1 precipitation in fluid 2 at up and bottom walls in the middle and right region. it feels like part of fluid one dissolves in fluid 2 and then precipitates at the top and bottom boundary walls.

Why does this happen? especially, if its due to the partial miscibility of two fluids, then, why does it happen when G is 4 but doesn’t when G is 3. since G is a measurement of repulsive forces between fluids, shouldn’t the fluids be “more immiscible” when G is 4?