aphros VS fltkhs

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.

fltkhs is under active maintenance and development: https://github.com/deech/fltkhs/tree/TheGreatConsolidation

If you want to make a simple desktop GUI, fltkhs — which binds to the FLTK library — is a good bet, as it's the easiest to install of all the Haskell desktop GUI libraries (even on Windows!). Unfortunately, the FLTK library doesn't create the prettiest GUIs in the world (e.g. see the GitHub page). If you care about such things, the author has also released the fltkhs-themes library, which provides a set of widgets with a much nicer style - see the GitHub page for a showcase.