Dr. Rainer H. Helmig of the University of Stuttgart will offer two lectures
Dr. Rainer H. Helmig will offer two lectures in the 2015 Henry Darcy Distinguished Lecture Series in Groundwater Science, the National Ground Water and Research Educational Foundation announced.
Helmig is head of the department of hydromechanics and modelling of hydrosystems at the Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart, Germany.
The first of his two lectures is titled "Evaluating the Competitive Use of the Subsurface: The Influence of Energy Storage and Production in Groundwater." In this lecture, Helmig will provide insight into how advanced numerical models may be used to analyze and predict the mutual influence of subsurface projects and their impact on groundwater reservoirs, and the expanding need to do so.
During this lecture, participants will learn about:
- Possible utilization conflicts in subsurface systems and how groundwater is affected
- Fundamental properties and functions of a compositional multiphase system in a porous medium; basic multiscale and multiphysics concepts will be introduced and conservation laws formulated
- Large-scale simulation that shows the general applicability of the modeling concepts of such complicated natural systems, especially the impact on the groundwater of simultaneously using geothermal energy and storing chemical and thermal energy, and how such real large-scale systems provide a good environment for balancing the efficiency potential and possible weaknesses of the approaches discussed.
The second lecture is titled "Modeling and Analysis of Soil-Moisture Processes in the Subsurface: The Influence of Evaporation and Salt Precipitation in Groundwater." In this lecture, Helmig will explore how soil-moisture processes in the subsurface play a crucial role in the hydrological cycle and the groundwater budget.
In this lecture, participants will learn about:
- Relevant processes of mass, momentum and energy transfer at the interface between a free-flow and a porous-media system
- Conceptual modeling for coupled single-phase free flow and two-phase porous-medium flow with a detailed description of the models in the free flow and in the porous medium
- A new coupling concept for modeling coupled porous-medium and free flow with application to evaporation and salt-precipitation processes; a comparison study will show the advantages and disadvantages in comparison with classical approaches
- Three model combinations for evaporation processes and how to use them to study the effects of various quantities and processes-a porous-medium model coupled with a laminar free-flow model, a simple boundary-layer model, and a Reynolds-averaged turbulence model that uses algebraic expressions to account for the turbulent flow behavior.