Aphrós

Finite volume solver for incompressible multiphase flows with surface tension.

Key features:

• implementation in C++14
• scalability to thousands of compute nodes with the Cubism library for distributed computing on structured grids
• coroutines to enable encapsulation in the block-wise processing framework
• fluid solver based on SIMPLE or Bell-Colella-Glaz methods
• conservative split PLIC advection solver
• novel particle method for curvature estimation improving the accuracy at low resolutions [demo] [4]

Clone

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

Documentation

https://cselab.github.io/aphros/doc

Generated in doc/sphinx.

Requirements

C++14, cmake, MPI, hdf5 (parallel), python3, python3-numpy.

Bundled dependencies:

• hypre
• eigen (optional)
• overlap (optional)
• vofi (optional)
• fpzip (optional)

Build and install

Follow instructions from deploy/README.md to prepare environment and install dependencies.

Configure, build, install and run tests:

cd src
make -j4
make test

Docker

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

docker build github.com/cselab/aphros --tag aprhos
docker run -i aphros

Videos

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

Coalescence of bubbles [4]	Taylor-Green vortex with bubbles [2]
Bubble trapped by vortex ring [5]	Plunging jet [2]
Electrochemical reactor [1]	Bubbles through mesh
Rising bubbles clustering on the surface [6] [7]	Foaming waterfall [8]

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
• 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
3. P. Karnakov, S. Litvinov, P. Koumoutsakos "Coalescence and transport of bubbles and drops" 10th International Conference on Multiphase Flow (ICMF), 2019
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
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
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