CentresHelmholtz Centre Potsdam GFZ German Research Centre for Geosciences
KeywordsExplicit visco-elasto-plastic rheology semi-brittle/semi-ductile deformation of porous rocks damage rheology and porosity feedback
Research fieldEarth & Environment
Scientific communityComputational geodynamic modelling
FundingHelmholtz Centre Potsdam GFZ German Research Centre for Geosciences
CostsFree and Open
LYNX in a nutshell
LYNX (Lithosphere dYnamics Numerical toolboX) is a multiphysics modelling solution developed within the group of Basin Modelling at GFZ. LYNX is based on the flexible, object-oriented numerical framework MOOSE, which provides a high-level interface to state of the art nonlinear solver technology. LYNX is a novel numerical simulator for modelling thermo-poromechanical coupled processes driving the deformation dynamics of the lithosphere. The formulation adopted in LYNX relies on an efficient implementation of a thermodynamically consistent visco-elasto-plastic rheology with anisotropic porous-visco-plastic damage feedback. The main target is to capture the multiphysics coupling responsible for semi-brittle and semi-ductile behaviour of porous rocks as also relevant to strain localization and faulting processes. More information on the governing equations, their derivation and their implementation together with a list of synthetic and real case applications can be found in two publications here and here.
LYNX has been coded following the concept of Object-orientation thus providing a flexible modular structure within easy to be extended modules by the user. It also features geometric agnosticism and hybrid parallelism with proven scalability on HPC architectures. LYNX is based on a realistic physics-based rheological description of lithosphere deformation dynamics based on an explicit incorporation of the lithosphere visco-elasto-plastic rheology including nonlinear feedback effects from the energetics of the system and its extension to account for time-dependent brittle behavior via an overstress (viscoplastic) formulation. It also includes a thermodynamically consistent formulation of semi-brittle semi-ductile deformation including brittle rock behaviour via damage mechanics and ductile deformation via a rate-dependent viscoplastic formulation. Poro-damage feedback is included via a dynamic porosity to simulate the full volumetric mechanical response of the rock. In LYNX we adopt an implicit and efficient numerical implementation of the material consticutive behaviour within a limited amount of internal iterations and we make use of the concept of Automatic Differentation (AD) techniques to compute the full Jacobian contribution of the system matrix.
Back to Software Spotlights Overview