Skip to Main content Skip to Navigation
Journal articles

Hybrid Galerkin numerical modelling of elastodynamics and compressible Navier–Stokes couplings: applications to seismo-gravito acoustic waves

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.
Complete list of metadata

Cited literature [47 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01620779
Contributor : Dimitri Komatitsch Connect in order to contact the contributor
Submitted on : Monday, December 4, 2017 - 2:06:24 PM
Last modification on : Monday, June 14, 2021 - 10:41:20 AM

File

Brissaud_19210.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Quentin Brissaud, Roland Martin, Raphaël F. Garcia, Dimitri Komatitsch. Hybrid Galerkin numerical modelling of elastodynamics and compressible Navier–Stokes couplings: applications to seismo-gravito acoustic waves. Geophysical Journal International, Oxford University Press (OUP), 2017, 210 (2), pp.1047 - 1069. ⟨10.1093/gji/ggx185⟩. ⟨hal-01620779⟩

Share

Metrics

Record views

583

Files downloads

1218