Solute transport with irregular source geometry in non-uniform flow simulated with new PTRW algorithm (University of Stuttgart).
Solute transport with irregular source geometry in non-uniform flow through a heterogeneous porous medium. Pure-phase DNAPL trapped within the porous medium is indicated by pink spheres. Dissolved concentrations are visualized as iso-surfaces (blue – low concentration, red – high concentration)
Researchers at the Institute for Modelling Hydraulic and Environmental systems have developed a new particle-tracking random walk algorithm that can account for Dirichlet and third-type boundary conditions with irregular geometries (such as DNAPL dissolution into ambient groundwater flow from a realistic space distribution of trapped DNAPL saturations).
The idea is to use PTRW as a Lagrangian technique to solve diffusive-advective transport at high Péclet numbers. However, the Dirichlet boundary condition has to be defined within a Eulerian manner, as concentrations in PTRW methods require to invoke artificial control volumes. The technique uses a Galerkin projection of PTRW simulations onto control volumes that represent the boundary condition. Publication submitted to Water Resources Research.
Dipl.-Ing. Jonas Koch, Jun.-Prof. Wolfgang Nowak
Institute for Modelling Hydraulic and Environmental Systems
University of Stuttgart, Germany
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