Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-41
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
21 Mar 2017
Review status
A revision of this discussion paper is under review for the journal Geoscientific Model Development (GMD).
MicroHH 1.0: a computational fluid dynamics code for direct numerical simulation and large-eddy simulation of atmospheric boundary layer flows
Chiel C. van Heerwaarden1,2, Bart J. H. van Stratum1,2, Thijs Heus3, Jeremy A. Gibbs4, Evgeni Fedorovich5, and Juan-Pedro Mellado2 1Meteorology and Air Quality Group, Wageningen University, Wageningen, The Netherlands
2Max Planck Institute for Meteorology, Hamburg, Germany
3Cleveland State University, Cleveland, OH, USA
4Department of Mechanical Engineering, University of Utah, UT, USA
5University of Oklahoma, Norman, OK, USA
Abstract. This paper describes MicroHH 1.0, a new and open source (www.microhh.org) computational fluid dynamics code for the simulation of turbulent flows in the atmosphere. It is primarily made for direct numerical simulation, but also supports large-eddy simulation (LES). The paper covers the description of the governing equations, their numerical implementation, and the parametrizations included in the code. Furthermore, the paper presents the validation of the dynamical core in the form of convergence and conservation tests, and comparison of simulations of channel flows and slope flows against well-established test cases. The full numerical model, including the associated parametrizations for LES, has been tested for a set of cases under stable and unstable conditions, under the Boussinesq and anelastic approximation, and with dry and moist convection under stationary and time-varying boundary conditions. The paper presents performance tests showing good scaling from 256 to 32,768 processes. The Graphical Processing Unit-enabled version of the code reaches speedups of more than an order of magnitude with respect to the conventional code for a variety of cases.

Citation: van Heerwaarden, C. C., van Stratum, B. J. H., Heus, T., Gibbs, J. A., Fedorovich, E., and Mellado, J.-P.: MicroHH 1.0: a computational fluid dynamics code for direct numerical simulation and large-eddy simulation of atmospheric boundary layer flows, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-41, in review, 2017.
Chiel C. van Heerwaarden et al.
Chiel C. van Heerwaarden et al.

Model code and software

MicroHH 1.0
C. C. van Heerwaarden, B. J. H. van Stratum, T. Heus, J. A. Gibbs, E. Fedorovich, and J.-P. Mellado
https://doi.org/10.5281/zenodo.401381
Chiel C. van Heerwaarden et al.

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Short summary
MicroHH (www.microhh.org) is a new and open source computational fluid dynamics code for the simulation of turbulent flows in the atmosphere. It is made to simulate atmospheric flows up to the finest detail levels at very high resolution. It has been designed from scratch in order to use a modern design that allows the code to run on more than 10.000 cores, as well as on a Graphical Processing Unit.
MicroHH (www.microhh.org) is a new and open source computational fluid dynamics code for the...
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