Several different numerical methods for calculating diffuse radiation viewfactors are described. Each is applied to a range of surface configurations, from almost completely unobstructed to a dense set of intersecting surfaces. The speed, accuracy, and unique characteristics are discussed in order to define optimal methods for different surface geometries.
A Comparative Study of Methods for Computing the Diffuse Radiation Viewfactors for Complex Structures
Emery, A. F., Johansson, O., Lobo, M., and Abrous, A. (May 1, 1991). "A Comparative Study of Methods for Computing the Diffuse Radiation Viewfactors for Complex Structures." ASME. J. Heat Transfer. May 1991; 113(2): 413–422. https://doi.org/10.1115/1.2910577
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