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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-226
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
10 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Adaptation of the meteorological model Meso-NH to laboratory experiments: implementations and validation
Jeanne Colin, Christine Lac, Valéry Massion, and Alexandre Paci CNRM, UMR 3589 METEO-FRANCE & CNRS. 42, av. G. Coriolis, 31057 Toulouse, France
Abstract. A meteorological numerical model can be a powerful tool to complement laboratory experiments applied to atmospheric sciences, but it needs to be adapted in order to represent flows generated in laboratory. This paper presents such an adaptation of the atmospheric non-hydrostatic model Meso-NH. The usually neglected viscous diffusive fluxes have been added to the model’s equations, along with the coding of an explicit bottom no-slip boundary condition was implemented. These implementations are validated against exact solutions of ideal flows. Meso-NH is then used in a configuration matching a laboratory experiment performed in the CNRM large stratified water flume meant to reproduce a neutral atmospheric boundary layer. The model is run for the first time in an explicit mode (Direct Numerical Simulation – DNS) at a very high resolution (1 mm) over a large grid. The comparison with the experimental data shows that the boundary layer height and vertical profiles of mean velocity are well captured by the model. This result further validates the implementations carried out in Meso-NH which can now be used in a DNS mode to simulate channel flows. The joint use of Meso-NH and laboratory experiments, along with the possibility to run DNS with Meso-NH, could lead to new findings or improvements in the field of atmospheric sciences.

Citation: Colin, J., Lac, C., Massion, V., and Paci, A.: Adaptation of the meteorological model Meso-NH to laboratory experiments: implementations and validation, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-226, in review, 2017.
Jeanne Colin et al.
Jeanne Colin et al.
Jeanne Colin et al.

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Short summary
The meteorological model Meso-NH is adapted in order to be run in DNS mode (Direct Numerical Simulation) to represent atmospheric flows generated in laboratory. The implementations we performed are validated against exact solutions and experimental data. Thus, Meso-NH can now be used as a complement to laboratory experiments, to complete and/or extend the data. The ability to run it in DNS also brings new prospects as it offers a new framework to test parametrizations of fine-scale processes.
The meteorological model Meso-NH is adapted in order to be run in DNS mode (Direct Numerical...
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