The negatively buoyant turbulent wall jet: Performance of alternative options in RANS modelling

摘要: Abstract The paper describes the application of different levels turbulence closure and near-wall treatment to computation a 2D downward-directed wall jet that encounters slow, upward-moving flow. working fluid is water two streams may be at same temperature or wall-jet hotter, leading significant buoyant effects. distance penetration found highly dependent on model employed. It established first new analytical function (AWF) developed by authors [Int. J. Heat Fluid Flow 23 (2002) 148] leads flow predictions in close agreement with so-called `low-Reynolds-number' where computations extend all way wall. However, for some test cases, both sets calculations (employing an eddy-viscosity model) indicate too great into opposing stream. use AWF conjunction second-moment closure, particularly one which satisfies two-component-limit, gives generally closer agreement.