Numerical simulation of two-dimensional laminar incompressible offset jet flows

Two-dimensional transient laminar incompressible offset jet is simulated numerically to gain insight into convective recirculation and flow processes induced by an offset jet. The behaviour of the jet with respect to offset ratio (OR) and Reynolds number (Re) are described in detail. The transient development of the velocity is simulated for various regions: recirculation, impingement and wall jet development. It is found that the reattachment length is dependent on both Re and OR for the range considered. Simulations are made to show the effect of entrainment on recirculation eddy. A detailed study of u velocity decay is reported. The decay rate of horizontal velocity component (it) is linear in impingement region. It is found that at high OR, velocity decay depends on Re only. Velocity profile in the wall jet region shows good agreement with experimental as well as similarity solutions. It is found that the effect of Re and OR are significant to bottom wall vorticity up to impingement region. Far downstream bottom wall vorticity is independent of OR. Copyright (c) 2005 John Wiley & Sons, Ltd.