Study on the Behavior of Near-Field Dilution of Thermal Buoyant Jet Discharged Horizontally in Compound Open-Channel

The RNG k-epsilon model with consideration of the buoyancy effect,which was solved by using the hybrid finite analytic method,was used to simulate the mixture of the horizontal round thermal buoyant jet in compound open channel flow. The mixing features near the spout and flowing characteristic of the secondary currents were studied by numerical simulation.Meanwhile,1) the distribution of the measured isovels for stream-wise velocity,2) secondary currents,3) the distribution of the measured isovels for temperature of typical cross-section near the spout,were obtained by using the three-dimensional Micro ADV and the temperature measuring device.Compared with experimental data,the RNG k-epsilon model based on buoyancy effect can preferably simulate the jet which performs the bifurcation phenomenon,jet reattachment(Conada effect) and beach secondary currents phenomenon with the effect of ambient flow,buoyancy,and secondary currents of compound section and so on.