Rayleigh-Taylor instability

Rayleigh-Taylor This is a typical benchmark in fluid dynamics. Two fluids are initially placed one above the other with the denser on top. The initial interface between the two has a sinusoidal shape as it can be seen from the first frame of the animation. Because of gravity the two fluids start to move producing the typical patterns of the Rayleigh-Taylor instability followed by a chaotic evolution where the two fluids try to exchange their location.

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Joining Dropplets

Joining DroppletsTwo water dropplets surrounded by air are projected against each other and join due to surface tension. While the dam break problem was solved with a free-surface, single-phase model, the present problem is attacked with a multi-phase model which supports large viscosity ratios (water/air).

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Dam Break

Dam BreakA classical benchmark for free-surface models, this simulation describes the evolution of a fluid initially confined in a rectangular box. As one of the side walls is removed, the fluid enters a larger confined domain which it fills at a well-known rate. For this application, Palabos makes use of a free-surface model inspired by a volume-of-fluid method.

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Bubble Burst

Dam BreakAn air bubble is injected into water at high speed and bursts through the water surface. Dynamic aspects crucially influence the shape of the bubble and the mechanism of the burst. Comparison with experiments show that the physics of this multi-phase system with high viscosity ratio is accurately reproduced.

 

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Rock melting in a magma chamber

MeltingThe geometry of this three-phase problem is defined by the porous rock structure of solid magma. The pores are filled with liquid magma which interacts with the solid through melting/cristallisation. Hot gas bubbles raising inside this media through buoyancy are responsible for heat convection, leading ultimately to complete melting.

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Falling Droplet

palabos-falling-droplet-iconPalabos' VOF-based multi-phase model handles very large viscosity ratios, and arbitrarily large density ratios. To demonstrate this, we simulated a free-fall of a droplet which falls at different speeds in a media with increasingly larger density.

 

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Flow-focusing device (micro-fluid)

MicrofluidA device of the type "lab-on-a-chip" contains fluids that need to be controlled accurately at micro-scale. A flow-focusing device solves the task of separating one of the phases ("the red phase") in a two-phase flow into regular portions, without mechanical interaction. This is achieved at a cross section of two channels, where the second phase ("the blue phase") is injected from two sides in a lateral direction, squeezing the red fluid and forcing the creation of regular portions.

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Bubble Splitter

palabos bubble splitter iconIn this example, air bubbles are raising in water through the effect of buoyancy. An obstacle is placed on the way to demonstrate the effects of surface tension, wall contact angle, bubble splitting and merging.

 

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