Abstract
We discuss the slipping boundary condition in fluid dynamics. We argue that when the boundary is a well defined and smooth surface, the slipping boundary condition is the correct choice. The Grad 13-moment equations are used to describe the hydrodynamic fields for the slow stationary flow of a viscous compressible and low density fluid. We study a planar Couette flow and flow around an arbitrary obstacle. The equations are solved for the flow past a sphere. The drag on the sphere is calculated to second order in the mean free path.
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