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Titolo:
VARIABLE SPATIAL AND TEMPORAL WEIGHTING SCHEMES FOR USE IN MULTI PHASE COMPOSITIONAL PROBLEMS
Autore:
UNGER AJA; FORSYTH PA; SUDICKY EA;
Indirizzi:
UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES,DEPT EARTH SCI WATERLOO ONN2L 3G1 CANADA UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES,DEPT EARTH SCI WATERLOO ONN2L 3G1 CANADA
Titolo Testata:
Advances in water resources
fascicolo: 1, volume: 19, anno: 1996,
pagine: 1 - 27
SICI:
0309-1708(1996)19:1<1:VSATWS>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Keywords:
FLUX LIMITER; MULTIPHASE; COMPOSITIONAL; MONOTONICITY; MACRODISPERSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
A.J.A. Unger et al., "VARIABLE SPATIAL AND TEMPORAL WEIGHTING SCHEMES FOR USE IN MULTI PHASE COMPOSITIONAL PROBLEMS", Advances in water resources, 19(1), 1996, pp. 1-27

Abstract

Variable spatial and temporal weighting of the advective contaminant mole fraction term is explored as a means of reducing numerical dispersion of contaminant plumes in a multi-phase compositional simulator. The spatial schemes considered are upstream, central and a non-linear flux limiter, while fully-implicit and Crank-Nicolson time weighting are examined. The performance of each weighting scheme, in terms of stability of the Newton iteration and computational cost, is assessed for simplified problems designed to be representative of various aspects of more complex subsurface remediation problems. Results indicate that for problems with an homogeneous permeability field, the non-linear flux limiter along with fully-implicit weighting gives superior performance to any other combination of spatial and temporal weighting schemes. For heterogeneous permeability fields, the macrodispersion imparted by heterogeneity dominates numerical dispersion so that smearing of contaminant mole fraction fronts does not appear to be a serious problem.

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Documento generato il 03/12/20 alle ore 12:52:50