Tests for Validation Problems of Anomalous Intensification of Separation Flow and Heat Transfer on Structured Surfaces with Extraordinary Pressure Differences

Abstract

New tests of software packages and turbulence models for validating the problems of highly intense vortex flows past structured energy-effective surfaces are presented. The idea of the testing is based on the discovery of anomalous intensification of separation flows and heat transfer in inclined grooves in plates and channel walls. At the expense of extraordinary pressure differences in the grooves, which are confirmed in experiments, swirl flows with high velocities of return and secondary currents are formed. These velocities are comparable with that of the freestream. Moreover, high-gradient zones with friction and heat removal many times higher (by a factor of from 1.5–2 to 7–9) than the friction and heat removal on a flat wall are formed. By way of illustration, we present the results of testing the VP2/3 software package developed on the basis of original muliblock computational technologies and using intersecting different-in-scale grids. The comparison of the numerical predictions with M.A. Zubin’s experiments confirmed the high static-pressure differences between the deceleration zone on the windward slope of an inclined groove and the negative pressure region at the place of tornado-like flow generation on the spherical entry segment and asserted the applicability of the RANS approach in predicting the characteristics of highly-intense swirled flows.