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Numerical Heat Transfer, Part B: Fundamentals
An International Journal of Computation and Methodology
Volume 24, 1993 - Issue 4
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Original Articles

RAY EFFECT AND FALSE SCATTERING IN THE DISCRETE ORDINATES METHOD

John C. Chai Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, 55455
,
HaeOk S. Lee NASA Lewis Research Center, Cleveland, Ohio, 44135
&
Suhas V. Patankar Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, 55455
Pages 373-389 | Received 25 Nov 1992, Accepted 15 Jun 1993, Published online: 15 May 2007
 
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Abstract

A discussion on the ray effect and false scattering occurring in discrete ordinates solution of the radiative transfer equation is presented in this article. Ray effect arises from the approximation of a continuously varying angular nature of radiation by a specified set of discrete angular directions. It is independent of the spatial discretization practice. False scattering, on the other hand, is a consequence of the spatial discretization practice and is independent of the angular discretization practice. In multidimensional computations, when a beam is not aligned with the grid line, false scattering smears the radiative intensity field. It reduces the appearance of unwanted bumps, but does not eliminate ray effect. An inappropriate view of false scattering is also presented. Four sample problems are used to explain these two effects.

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