Abstract
This chapter discusses the treatment of wall boundaries. There is an aspect of the near-wall problem: the transport properties often vary steeply in the neighborhood of a wall. If the flow is laminar, this variation may be the result of steep temperature variations associated with intense heat transfer through the wall; and, if it is turbulent, that fact alone causes variations, because the effect of the turbulence on the transport of mass, momentum, and energy diminishes rapidly as the wall is approached. These problems may be solved by departing, for the regions close to the walls, from the presumptions about the inter-node distributions of velocity and other variables that serve for the central regions of the grid. Specifically, when the distances are computed, the velocity profiles are supposed to be curved. The diagrams in the chapter focuses attention on the I boundary. Both could be repeated, with appropriate alterations, for the E boundary; but this would be merely tedious.
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