Richard J.A.M. Stevens

Physics of Fluids

University of Twente

AFiD code

See the simulation tools highlight for a short summary of AFiD-GPU and its role in the group's research.

In the Physics of Fluids group at the University of Twente, we develop a highly parallel, open-source simulation package designed for canonical wall-bounded turbulent flows such as Rayleigh-Bénard convection, double-diffusive convection, Taylor-Couette flow, channel flow, and plane Couette flow. The code is developed in close collaboration with partners at the University of Rome "Tor Vergata" and specialists from SURFsara and NVIDIA Corporation. AFiD is available to the fluid-dynamics community as open-source software on GitHub. You can find the CPU version on GitHub and the GPU version on GitHub.

When using the GPU version, please cite:

X. Zhu, E. Phillips, V. Spandan, J. Donners, G. Ruetsch, J. Romero, R. Ostilla-Mónico, Y. Yang, D. Lohse, R. Verzicco, M. Fatica, R.J.A.M. Stevens, AFiD-GPU: A versatile Navier–Stokes solver for wall-bounded turbulent flows on GPU clusters, Comput. Phys. Commun. 229, 199-210 (2018).

When using the CPU version, please cite:

E.P. van der Poel, R. Ostilla-Mónico, J. Donners, R. Verzicco, A pencil distributed finite difference code for strongly turbulent wall-bounded flows, Computers & Fluids 116, 10-16 (2015).

The images below were generated from simulations performed with AFiD.

Rayleigh-Bénard convection

For corresponding video look at the Physics of Fluids YouTube channel. Further information is available on the thermal convection research page.
Rayleigh-Bénard convection simulation visualization

Visualization by E. van der Poel and R. Ostilla-Mónico.

Sheared convection

For corresponding video look at the Physics of Fluids YouTube channel.

Direct numerical simulation of sheared thermal convection flow field, winner of the SURFsara 2017 Visualization Competition
From: A. Blass, X. Zhu, R. Verzicco, D. Lohse, R.J.A.M. Stevens - Direct numerical simulations of sheared thermal convection, Winner of the 2017 SURFsara Visualization Competition.

Double diffusive convection

For corresponding video look at the Physics of Fluids YouTube channel. Salt fingers in double diffusive convection bounded by two parallel plates
From Y. Yang, E. van der Poel, R. Ostilla-Mónico, C. Sun, R. Verzicco, S. Grossmann, and D. Lohse, Salt fingers in double-diffusive convection bounded by two parallel plates. Submitted to the APS Division of Fluid Dynamics Gallery of Fluid Motion in 2014.

Taylor-Couette flow

Taylor-Couette flow visualization showing wall roughness induced turbulence
Visualisation by: X. Zhu, radius ratio η=0.714 for Ta=109.