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Abstract:
An improved prescription is given for limiting ('correcting') the high-order fluxes in multidimensional, flux-corrected transport (FCT) algorithms. These fluxes are designed to reduce the numerical error in positive- definite, monotone solutions to the hydrodynamics equations. The role of the limiter is to ensure that the desirable positivity and monotonicity properties of the low-order solutions are not lost in the quest to minimize the numerical error. It is shown that Zalesak's (1979) formulation of a limiter for multidimensional FCT preserves positivity but not monotonicity. The introduction of a prelimiting step into his prescription, based on the original positive and monotone limiter of Boris and Book (1973), is proposed and is shown to improve significantly the performance of multidimensional ECT algorithms.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Pages: |
22 |
| Report Date: |
31 DEC 1998 |
| Report Number: |
A221063 |
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