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Research Model
for Geophysical Flows

Upcoming Events

Past Events

EULAG Users Workshops

What is New in Eulag?

Public Notice

(Universite de Montreal)

PantaRhei Project (ECMWF)

CELO Project
(COSMO-EULAG operationalization)


EULAG is a numerical solver for all-scale geophysical flows. The underlying anelastic equations are either solved in an EULerian (flux form), or a LAGrangian (advective form) framework.

EULAG model is an ideal tool to perform numerical experiments in a virtual laboratory with time-dependent adaptive meshes and within complex, and even time-dependent model geometries. These abilities are due to the unique model design that combines the nonoscillatory forward-in-time (NFT) numerical algorithms and a robust elliptic solver with generalized coordinates. The code is written as a research tool with numerous options controlling the numerical accuracy and to allow for a wide range of numerical sensitivity tests. These capabilities give the researcher confidence in the numerical solutions of his/her problem. The formulation of the model equations allow for various derivatives of the code including codes for stellar atmospheres, ocean currents, sand dune propagation or biomechanical flows. EULAG is a fully parallelized code and is easily portable between different platforms.

All the model developments and details of the numerical algorithms are documented in a number of peer reviewed papers by Piotr Smolarkiewicz and his colleagues. The EULAG modeling system is developed and supported by the Cloud Systems Group in the Mesoscale and Microscale Meteorology Division, NCAR.

Example: QBO analogue simulation

Current announcements:

Past events:

5th International EULAG Users Workshop on "Numerical and computational methods for simulation of all-scale geophysical flows" was held at the European Centre for Medium-Range Weather Forecasts (ECMWF) in Reading, United Kingdom, from 3 to 6 October 2016.

"Eulerian vs. Lagrangian methods for cloud microphysics" , Warsaw on April 20-22, 2015. - workshop aimed at bring together researchers working on modelling cloud microphysics.

Special issues:

The special issue of the Acta Geophysica: Special volume 59 (6), 2011: Modeling Atmospheric Circulations with Sound-Proof Equations The papers collected in the present volume of Acta Geophysica address the capability of sound-proof equations to model all-scale atmospheric circulations. Technical topics covered in this special issue range from theoretical numerical analysis, model design, and massively-parallel programming to simulation of cloud processes, regional weather and global atmospheric circulations.

The special issue of the International Journal for Numerical Methods in Fluids: Volume 50, Issue 10 (10 April 2006) is devoted to recent developments and applications of high resolution methods based on MPDATA - Multidimensional Positive Definite Advection Transport Algorithm (issue edited by Joanna Szmelter). The papers published in this issue include the material presented during the XIII Conference on Finite Elements for Flow Problems at Swansea UK (4-6 April 2005).

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