High performance computing as a tool for groundwater cleanup

High Performance Computing (HPC) is a key enabling tool to interconnect the many, varied simulation capabilities required to advance the science of gr oundwater remediation. The US Army Engineer Waterways Experiment Station is engaged in research and development that will provide a seamless link to t ools that combine diverse field data into accurate site characterizations, and perform computer simulations of remediation processes. However, the sim ulation models on which this capability is founded are still not adequate t o simulate real, heterogeneous media that make up the natural groundwater e nvironment. The inadequacy stems from the multi-scale structure of natural media that is masked by the continuum formulations upon which numerical mod els are based. The range of scales is simply too great to be spanned by any present, or foreseeable, HPC resource. To advance the science of multi-sca le simulation, HPC may be viewed as an extension of the laboratory. By stre tching present resources to perform scale-spanning simulations, stochastic models are created from data that could not be obtained previously from phy sical experiments. A detailed description of this process is presented for non-reactive, dispersive transport.