Aphros

Finite volume solver for incompressible multiphase flows with surface tension.

Key features:

• implementation in C++14
• scalability to thousands of compute nodes
• fluid solver based on SIMPLE or Bell-Colella-Glaz methods
• advection with PLIC volume-of-fluid
• particle method for curvature estimation accurate at low resolutions [demo] [4]
• Multi-VOF for scalable coalescence prevention [demo] [8] [9]

Gallery of interactive simulations

Gallery wiki	Curvature	Multi-VOF	Electrochemistry

Documentation

Online version generated in doc/sphinx.

Requirements

C++14, CMake

Optional dependencies: MPI, parallel HDF5, python3, python3-numpy

Bundled optional dependencies: hypre, eigen, overlap, vofi, fpzip

Clone and build

git clone https://github.com/cselab/aphros.git

First, follow deploy/README.md to prepare environment and install dependencies. Then build with

cd src
make

Docker

Instead of building the code in your system, you can build a Docker container and run a simulation example

docker build github.com/cselab/aphros --tag aphros
cd examples/202_coalescence/standalone
./conf
docker run -v `pwd`:`pwd` -w `pwd` aphros

Minimal build without CMake

Build without dependencies and tests on unix-like systems (APHROS_PREFIX is the installation location, with USE_MPI=1 builds with MPI)

cd src
make -f Makefile_legacy install APHROS_PREFIX=$HOME/.local USE_MPI=0

on Windows using Microsoft C++ toolset (NMAKE, LINK, and CL):

cd src
nmake /f Makefile_nmake

Videos

Examples of simulations visualized using ParaView and OSPRay in collaboration with Jean M. Favre at CSCS.

Coalescence of bubbles [conf] [4]	Taylor-Green vortex with bubbles [2] [5]
Bubble trapped by vortex ring [5]	Plunging jet [2]
Electrochemical reactor [1]	Bubbles through mesh
Clustering of bubbles [conf] [6] [7] [9]	Foaming waterfall [conf] [8] [9]

APS Gallery of Fluid Motion 2019 award winner Breaking waves: to foam or not to foam? [6]

Developers

Aphros is developed and maintained by researchers at ETH Zurich

• Petr Karnakov
• Dr. Sergey Litvinov
• Dr. Fabian Wermelinger

under the supervision of

• Prof. Petros Koumoutsakos

Publications

1. S. M. H. Hashemi, P. Karnakov, P. Hadikhani, E. Chinello, S. Litvinov, C. Moser, P. Koumoutsakos, and D. Psaltis, "A versatile and membrane-less electrochemical reactor for the electrolysis of water and brine", Energy & environmental science, 2019 10.1039/C9EE00219G
2. P. Karnakov, F. Wermelinger, M. Chatzimanolakis, S. Litvinov, and P. Koumoutsakos, "A high performance computing framework for multiphase, turbulent flows on structured grids" in Proceedings of the platform for advanced scientific computing conference on – PASC ’19, 2019 10.1145/3324989.3325727 [pdf]
3. P. Karnakov, S. Litvinov, P. Koumoutsakos "Coalescence and transport of bubbles and drops" 10th International Conference on Multiphase Flow (ICMF), 2019 [pdf]
4. P. Karnakov, S. Litvinov, and P. Koumoutsakos, "A hybrid particle volume-of-fluid method for curvature estimation in multiphase flows”, International journal of multiphase flow, 2020 10.1016/j.ijmultiphaseflow.2020.103209 arXiv:1906.00314
5. Z. Wan, P. Karnakov, P. Koumoutsakos, T. Sapsis, "Bubbles in Turbulent Flows: Data-driven, kinematic models with history terms”, International journal of multiphase flow, 2020 10.1016/j.ijmultiphaseflow.2020.103286 arXiv:1910.02068
6. P. Karnakov, S. Litvinov, J. M. Favre, P. Koumoutsakos "V0018: Breaking waves: to foam or not to foam?" Gallery of Fluid Motion Award 10.1103/APS.DFD.2019.GFM.V0018
7. Annual report 2019 of the Swiss National Supercomputing Centre (cover page) [link]
8. P. Karnakov, F. Wermelinger, S. Litvinov, and P. Koumoutsakos, "Aphros: High Performance Software for Multiphase Flows with Large Scale Bubble and Drop Clusters" in Proceedings of the platform for advanced scientific computing conference on – PASC ’20, 2020 10.1145/3394277.3401856 [pdf]
9. P. Karnakov, S. Litvinov, P. Koumoutsakos "Computing foaming flows across scales: from breaking waves to microfluidics", 2021 arXiv:2103.01513