Reactive transport models in heterogeneous systems from pore to reservoir scale

Simulating hydrodynamic reactive transport processes in heterogeneous systems is required
in various research fields and applications including environmental remediation, geological
storage, and energy production. Developing reliable numerical tools for these environmental
issues requires to consider both the structural heterogeneities encountered in the natural
environment, and the complexity of the (bio)geochemical reactions associated with each
application. The former is very often modeled at the expense of the latter, in particular when
studying large-scale heterogeneous systems such as fractured rocks for which most of the
modeling effort focuses on the multi-scale structural heterogeneities. These features are
responsible for anomalous transport behavior that is well reproduced by particle-based (PB)
methods with optimized computational cost. After introducing PB methods that are usually
used for modeling reactive transport in fractured rocks, I will present a new random walk
approach that is designed for complex (bio)geochemical reactions and upscaling purpose.