ANáLISE DA ABORDAGEM SINGLE POINT RANS PARA O ESCOAMENTO DO TIPO JATO LIVRE AXISSIMéTRICO E INCOMPRESSíVEL

In this study, we performed several numerical simulations for the axisymmetric free jet flow,incompressible and turbulent, in order to evaluate the assertions from Taulbee (1989), George (1989) andGeorge and Davidson (2004), which converge in the statement that the single-point RANS (ReynoldsaveragedNavier–Stokes) modeling does not possess the necessary physics to account for the asymptoticdependence of the origin of the jet in its development. The main goal of the present study is limited toshow some results, without attempting to solve this assertion. Additionally we present a brief analysis ofthe influence of the jet origin conditions on the fully developed flow region. The results from simulationscorroborate the assertion of these abovementioned authors and also indicate that there is no general setof constants of turbulence models that is universally valid. We verified that the fully developed region isdependent not only on the amount of momentum at the nozzle exit, consequently, the jets reach differentself-similar states in function of the details of its origin, contrasting the classical self-similarity hypothesis.