The sensitivity of numerical advection schemes to mass inconsistency in wind fields
Conference
·
OSTI ID:422898
- Univ. of California, Riverside, CA (United States). Coll. of Engineering
While most air quality models use some sort of scheme to make wind fields mass consistent, the adjustment of the wind field has to be limited to make sure that the final wind field is close to the observed winds. This paper considers the effect of these errors within the framework of two classes of advection routines based on alternative forms of the advection equation. These are the Bott (1989) scheme that solves the flux or conservative form of the governing transport equation, and the cubic-spline semi-Lagrangian scheme that solves the advective or primitive form of the transport equation. While the flux scheme conserves mass integrated over the modeling domain, it does not conserve the ratio of concentrations of different species-mixing ratio, if the wind field is not mass consistent. On the other hand, the semi-Lagrangian scheme does conserve mixing ratio, but is not designed to conserve mass globally. In this study, the authors evaluate the sensitivity of the flux and advective transport schemes to degrees of mass inconsistency in wind fields.
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 422898
- Report Number(s):
- CONF-960127--
- Country of Publication:
- United States
- Language:
- English
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