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RECORD NUMBER: 26 OF 1642

OLS Field Name OLS Field Data
Main Title Adaptive Local Grid Refinement to Solve Nonlinear Transport Problems with Moving Fronts.
Author Yeh, G. T. ; Cheng, H. P. ; Cheng, J. R. ; Short, T. E. ; Enfield, C. ;
CORP Author National Risk Management Research Lab., Ada, OK. Subsurface Protection and Remediation Div. ;Pennsylvania State Univ., University Park. Dept. of Civil and Environmental Engineering.;National Research Council, Washington, DC.
Publisher Mar 96
Year Published 1996
Report Number EPA/600/A-96/023;
Stock Number PB96-169842
Additional Subjects Environmental transport ; Nonlinear systems ; Water pollution ; Algorithms ; Groundwater ; Pollutants ; Mathematical models ; Chemical transport
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NTIS  PB96-169842 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/15/1996
Collation 10p
Abstract
Highly nonlinear advection-dispersion-reactive equations govern numerous transport phenomena in subsurface media. This paper presents the development and verification of a computational algorithm to approximate the highly nonlinear transport equations of multiphase flow and reactive chemical transport. The algorithm was developed based on the Lagrangian-Eulerian decoupling method with an adaptive ZOOMing and Peak/valley Capture (LEZOOMPC) scheme. It consisted of both backward and forward node tracking, rough element determination, peak/valley capturing, and adaptive local grid refinement. A second order implicit tracking was implemented to accurately and efficiently track all fictitious particles. The unique feature of the algorithm is the adaptive mechanism. Unlike other adaptive local grid refinement methods, the adaptive mechanism of LEZOOMPC was based on the almost 'true' error estimates. The accuracy and efficiency of the algorithm was verified with the Burger's equation for a variety of cases. The robustness of the algorithm to achieve convergent solutions was demonstrated for highly nonlinear multiphase flow and reactive contaminant transport problems.