NUMERICAL PREDICTION OF TURBULENT FLOW OVER A SURFACE-MOUNTED CUBE

Abstract

Theoretical and experimental studies are reported on the three-dimensional turbulent flow over a surface-mounted cube, oriented with one face perpendicular to the uniform incident flow. A triaxial hot wire probe was used to measure the mean and fluctuating velocities. Flow visualization technique was used to observe the extent of the recirculating flow. The numerical method consists of a finite-different procedure for solving the momentum and continuity equations with two additional conservation equations for the turbulent kinetic energy and its dissipation rate. The modified version of k-ε model employs a new dissipation rate equation whose production term is made more sensitive to streamline curvature effects. The new implicit solution procedure was used to achieve a saving in c.p.u time for calculation. The prediction obtained is compared with present and other available experimental data. The results predicted are in general accord with experimental data, but there are certain discrepancies.