The flow along a wall moving reversely to a parallel non-Newtonian, power-law, stream
Summary: The flow induced by a flat plate, with finite length, moving reversely to a parallel ambient stream of a non-Newtonian, power-law fluid is considered in the present paper. This problem has been investigated partly in the past [\textit{J. B. Klemp} and \textit{A. Acrivos}, J. Fluid Mech. 53, 177--191 (1972; Zbl 0242.76019); ibid. 76, 363--381 (1976; Zbl 0344.76026)] but only for a Newtonian fluid and using a modified boundary layer approximation. In the present work, the investigation is based on the solution of the complete equations using the commercial code ANSYS FLUENT. It is found that for low Reynolds numbers and low power-law index (\(n < 0.5\)) the drag coefficient obeys the relationship \(c_D = A/\mathrm{Re}\). It was also found that the drag coefficient, in general, increases with the velocity ratio parameter \(\lambda\), but at \(\lambda\) around 2, the drag coefficient shows a local sharp decrease (drag crisis). An explanation for this crisis is given.
scientific article; zbMATH DE number 6976533