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* [!4247](https://gitlab.opengeosys.org/ogs/ogs/-/merge_requests/4247) MPL: Reimplement VariableArray as own class. Less memory and a little faster. Easier usage.
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## TH2M
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The TH2M process describes a two-phase, two-component approach, which is fully coupled with thermodynamic and geomechanical processes.
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Due to the complex process couplings, many different processes (e.g. in repository systems) can be investigated numerically, including media dry-out and resaturation, consolidation, stress- or deformation-dependent permeabilities, thermal expansion and heat-induced stresses, gas transport processes in fully or partially saturated media and others.
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The two-component approach also enables the description of phase transition processes (evaporation, solution) under an equilibrium condition.
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To validate the TH2M model, a benchmark suite was created that provides a hierarchical classification of different coupling combinations of the individual processes. This proves the validity and correct implementation of all terms of the model equations.
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* [!4131](https://gitlab.opengeosys.org/ogs/ogs/-/merge_requests/4131) Dissolution of gas into the liquid phase, completing the phase transition feature in TH2M
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* [!4131](https://gitlab.opengeosys.org/ogs/ogs/-/merge_requests/4131) Two tests validate the dissolution process and the diffusive transport of the dissolved gas in the water phase
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