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. This contributed poster shows the current state of development of a finiteelement implementation as part of an open source software library (OSSL) forthe simulation of thermo-hydro-mechanical (THM) coupled processes. Thereliable handling of numerical methods is fundamental for the understanding ofscientific interrelationships and thus, a crucial prerequisite for modelingTHM scenarios, as well as for the understanding and evaluation of preliminarysafety investigations during the site selection process for the storage ofhigh-level radioactive waste. There are several motivations for developing anin-house OSSL, which will allow us to: Build capacity and maintenance within BASE (Federal Office for the Safety of Nuclear Waste Management) regarding issues of the numerical modeling of safety-relevant aspects on the long-term safety analyses specified by the German legislator in the site selection process. Develop a collection of known benchmarks and evaluation examples for the comparison of different software tools, applying a uniform interface to simplify the use of the available highly specialized open source codes. Diversify the testing possibilities regarding the preliminary safety investigations by means of our own, independent modeling software. Document basic THM scenarios for internal or, if necessary, public technical training, e.g., density-driven fluid flow (Fig. 1), convergence in salt, temperature propagation in the repository area, crack development, diffusive or advective mass transport. Ensure transparency and, in principle, might allow for appropriately proven-quality (validated) and documented simulation tools for the public regarding questions about the preliminary safety investigations during the site selection process. The development of the OSSL is mainly based on the scripting language Python,which allows the necessary flexibility for the diverse fields of applicationand at the same time enables maximum transparency for all aspects of thesource code. To ensure the high quality of the software, state of the artdevelopment tools are used (e.g., version control, automated tests, anddocumentation generation). Figure 1 shows our preliminary simulation results of the so-called Elderproblem (Elder, 1967), a popular standard benchmark for thermo-hydrogeologicalcoupling in which fluid motion in a porous medium is driven by buoyancyforces.

Open Source Software Library for Thermo-Hydro-Mechanical Coupled Processes in Python