Final Stage Decay of Grid-Produced Turbulence

Abstract

A kinetic model of the final‐stage decay of grid‐produced turbulence is presented. Theoretical analysis leads to an inverse‐square energy decay law. The prediction has been confirmed by measurements in a low‐speed water channel. A replot of the Dryden‐Schubauer and Batchelor‐Townsend wind‐tunnel data also indicates better agreement with the present inverse‐square, rather than the$\frac{5}{2}$ ‐power decay law proposed by earlier investigators.