An H-Adaptive Finite Element Model for Environmental Transport Prediction

Document Type



It is widely recognized that major pollution problems and potential hazardous consequences now exist worldwide. Such concerns have lead to increased efforts in pollution transport and diffusion modeling by many researchers (Pielke, 1984; Domenico and Schwartz, 1990).

A rapid h-adaptive finite element model has been developed to calculate 2- and 3-D environmental fluid flow and species transport. The model runs on enhanced PCs, SGI workstations, and Cray class supercomputers.

The employment of adapting, unstructured meshes permits one to accurately solve large problems with a reduced number of nodal points. This is accomplished by concentrating (refining) nodes in those regions where most of the activity takes place, and unrefining in regions where solutions are smooth. However, the key to successful implementation of adaptive mesh techniques is in the choice of element type, handling of interface transitions, and rapid mesh refinement and unrefinement operations during the transient solution. Adaptive techniques are currently being used to simulate a wide range of complex flows, e.g., groundwater transport in porous media (Pepper and Stephenson, 1995), atmospheric transport over complex terrain (Pepper and Carrington, 1995), and compressible flows with shock capture (Devloo et al., 1988).


Engineering | Environmental Engineering | Environmental Sciences | Mechanical Engineering | Numerical Analysis and Scientific Computing


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