aphros VS Blender-FLIP-Fluids

APHROS (https://github.com/cselab/aphros) looks very well suited, but the documentation is challenging. Ultimately we will want to take CAD outputs (like STL) to define our simulation geometries.

This is a simulation of a membrane-less electrochemical reactor for water electrolysis. The reaction generates dissolved gases (hydrogen and oxygen) which nucleate into bubbles. The bubbles grow by diffusion and coalescence with other bubbles. Small bubbles (green) are treated as point particles and larger bubbles (orange) are deformable. * Simulation done in CFD solver Aphros * Web demo * Experimental study on membrane-less design

The Cheerios effect is named after the observation that breakfast cereals floating in milk often clamp together. This effect is driven by buoyancy and applies to various objects floating in water. Lighter objects, such as bubbles, elevate the surface attracting other bubbles as they "rise" in the elevation. Heavier objects lower the surface so other objects "fall" towards them. Simulation done in Aphros, visualized in ParaView, and described in article.

Based on experimental study (article, video). Simulation done in Aphros and described in article. The simulation gives you a detailed view at a high frame rate and also matches experimental data. The alternation between the two regimes is based on a slight change between the "pincher" bubble and the "wall" bubble downstream, which is enough to trigger or suppress the breakup.

Compare coalescence of bubbles (left) and droplets (right) in this vertical arrangement. Bubbles create a small satellite bubble while droplets do not. The initial radius of bubbles and droplets is about 0.5 mm. Simulation done with Aphros https://github.com/cselab/aphros​ . Checkout the gallery of interactive fluid simulations and an electrochemical reactor demo.

Compare coalescence of bubbles (left) and droplets (right) in this vertical arrangement. Bubbles create a small satellite bubble while droplets do not. The initial radius of bubbles and droplets is about 0.5 mm. Simulation done with Aphros https://github.com/cselab/aphros​ . Checkout the gallery of interactive simulations https://github.com/cselab/aphros/wiki/Aphros-Explorer

Right, the particle method was implemented in Basilisk for comparison with the method of height functions. Then we use the method in our own solver Aphros

Project author here. The gallery is part of scientific software Aphros https://github.com/cselab/aphros for flow simulations. Examples in the gallery demonstrate what physical problems can be solved. The same configuration can be used on larger computers (including supercomputers). Intended for potential users of the software and those willing to learn some fluid mechanics.

If all else fails, you may want to consider a premium addon like FLIP Fluids, which in my experience feels more stable than the default fluid sim, though it may be a bit costly. Consider trying the demo.

For troubleshooting conflicts between addons, it can help to test in a fresh Blender environment with default settings and installing/enabling addons one at a time. In case it helps, we have some instructions here for how to backup user-preferences, test in a clean environment, and then restore your original addons and settings: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/Baking-Crash-Troubleshooting#testing-the-flip-fluids-addon-in-a-clean-installation-of-blender

There's a free demo if you would like to try it out: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/FLIP-Fluids-Demo-Addon

The above was built from the code on the GitHub repository, which is under the GNU General Public License. This license allows for redistribution. Unfortunately, I do not have binaries for MacOS or Linux since I only use Windows. Also, note that the above download is for Blender 64-bit (which should be the default on the blender.org downloads page). The GitHub version doesn't have pre-made materials like the paid version on Blender Market. (Note: The demo file on GitHub has watermarks on the simulation. This is the full version of the addon, not to be confused with the demo.)

Make sure that your objects have correct manifold/closed/watertight geometry. See this topic for more info and how to verify geometry: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/Manifold-Meshes

This is also an open source project and we provide a free version with the source code here including build/compile instructions: https://github.com/rlguy/Blender-FLIP-Fluids

Thanks! Mostly by reading through the FLIP Fluid Wiki and watching some tutorials on YouTube.

The related documentation for how to enable and use attributes (such as the color attribute) is here: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/Domain-Attributes-and-Data-Settings