Author(s): C. Ariyaratne; S. He; A. E. Vardy
Linked Author(s):
Keywords: No Keywords
Abstract: Wall shear stresses (WSS) in a decelerating turbulent flow are studied using an experimentally-validated CFD model. Specific characteristics of the response of the wall shear stresses are attributed to combined influences of inertia and turbulence dynamics. In the case of a flow decelerating uniformly from a steady Reynolds number, inertia initially causes the WSS to undershoot the corresponding quasi-steady value. Thereafter, the WSS may continue to undershoot, or it may overshoot quasi-steady values, depending on the relative importance of inertia and turbulence dynamics, in the form of turbulence enhancement and delays in reduction. The dependence of WSS behaviour on key flow parameters is studied and is correlated using a non-dimensional parameter reflecting inertia and turbulence timescales.
Year: 2009