An analytic and numerical study of unsteady channel flow with slip

Miccal T Matthews, Karen M Hastie

Abstract


A theoretical investigation of the unsteady flow of a Newtonian fluid through a channel is presented using an alternative boundary condition to the standard no-slip condition, namely the Navier boundary condition, independently proposed over a hundred years ago by both Navier and Maxwell. This boundary condition contains an extra parameter called the slip length, and the most general case of a constant but different slip length on each channel wall is studied. An analytical solution for the velocity distribution through the channel is obtained via a Fourier series, and is used as a benchmark for numerical simulations performed utilizing a finite element analysis modified with a penalty method to implement the slip boundary condition. Comparison between the analytical and numerical solution shows excellent agreement for all combinations of slip lengths considered.

doi:10.1017/S1446181112000272

Keywords


channel flow; slip; Navier boundary condition; finite element; penalty method



DOI: http://dx.doi.org/10.21914/anziamj.v53i0.5544



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ANZIAM Journal, ISSN 1446-8735, copyright Australian Mathematical Society.