Brissaud, Quentin and Martin, Roland and Garcia, Raphaël F.
and Komatitsch, Dimitri
Hybrid Galerkin numerical modelling of elastodynamics and compressible Navier–Stokes couplings: applications to seismo-gravito acoustic waves.
(2017)
Geophysical Journal International, 210 (2). 1047-1069. ISSN 0956-540X
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(Document in English)
PDF (Publisher's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 5MB |
Official URL: http://dx.doi.org/10.1093/gji/ggx185
Abstract
We introduce a hybrid Galerkin modelling tool for the nonlinear acoustic and gravity wave propagation in planetary atmospheres coupled through topography to a solid medium. We rely on a 2-D spectral-element technique to model linear visco-elastic solid media and couple it to a discontinuous Galerkin method for the atmosphere modelled by the fully nonlinear Navier–Stokes equations. Significant benefits of such a method are, first, its versatility because it handles both acoustic and gravity waves in the same simulation, second, it enables one to observe nonlinear effects as convection or wave-breaking and, finally, it allows one to study the impact of ground-atmosphere coupling for waves propagating from seismic sources. Simulations are performed for 2-D isothermal atmosphere models with complex wind and viscosity profiles. We validate the computations by comparing them to finite-difference solutions, already validated in a previous paper. Specific benchmark validation cases are considered for both acoustic and gravity waves subject to viscosity variations, wind duct and nonlinear wave breaking. We apply this tool to study acoustic and gravity waves generated by a strong seismic source and its nonlinear breaking in the upper atmosphere.
Item Type: | Article |
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Additional Information: | Thanks to Oxford University Press editor. The definitive version is available at : https://academic.oup.com/gji/article/210/2/1047/3798201 |
HAL Id: | hal-01620779 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE) French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
Laboratory name: | |
Funders: | Université fédérale de Toulouse - Région Midi-Pyrénées - CALMIP |
Statistics: | download |
Deposited On: | 28 Nov 2017 14:17 |
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