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WP 2.1

Modeling for Simulating Storage Processes of Compressed Air, CH4 or Natural as well as Synthetic Natural Gas and H2 in Salt Caverns

 

Aim of work package WP 2.1 is the development of mathematical and numerical models for the simulation of the cyclic operation of salt caverns as an option for gas storage considering comparable short periods for charging and discharging. For this purpose, the necessary process relations (balance and constitutive laws) will be formulated. They serve as basis for the development of according coupled systems of field equations as well as of algorithms for their numerical solution within the framework of space and time discretization methods. Regarding the constitutive model components, geomechanical constitutive models addressing generalized three-dimensional stress states in salt structures will be defined based on existing approaches for specific stress states. Within this context, elastic, plastic and rate-dependent (e.g., viscous) properties are considered as well as the damage behaviour of rock salt. The selected, enhanced and newly developed field equations as well as geomechanical constitutive relations, respectively, will be subsequently implemented into the scientific open-source finite element software platform OpenGeoSys. Simultaneously, the models are planned to be integrated into the finite element programme Code_Bright for confirmation of models and software components within the framework of code comparisons. Using on benchmark simulations based on examples described in the literature as well as on examples defined on typical locations designed in ANGUS+, the newly developed model toolset will be intensively confirmed.

Working groups WG Kolditz (UFZ), WG Bauer (CAU) and WG Schanz (RUB) are jointly working on work package WP 2.1. The identification of relevant processes and the formulation of the according modelling toolset are based on information defined in WP 1.1. In order to parameterise model components, experimental results obtained from WP 1.6 will be used. Models developed from WP 2.1 serve as basis for scenario analyses in WP 3.1 as well as for contributions to work packages realising a synthesis of data and information.