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Solute transport with irregular source geometry in non-uniform flow simulated with new PTRW algorithm (University of Stuttgart).

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Short description:

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)

Long description:

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.

Contact:

Dipl.-Ing. Jonas Koch, Jun.-Prof. Wolfgang Nowak

Institute for Modelling Hydraulic and Environmental Systems

University of Stuttgart, Germany

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Conditions of use:

The picture is original work generated at the University of Stuttgart. The University of Stuttgart possesses the rights to publicly distribute the picture. The InterPore society is allowed to display it on its website. The InterPore society is also allowed to use the picture in other publications and presentations with appropriate attribution.