Numerical Study Of Characteristics Of Jets In Vertical Density-stratified Ambient Fluid

Before the wastewater intrudes into the environment, it's important to ensure that high initial mixing is achieved in the vicinity of the discharge structure by releasing the contaminated fluid through orifices and in the form of buoyant jets. Therefore, accurate understanding and predictions of the behaviour of a buoyant jet and its mixing characteristics are desired.The paper takes the vertical density-stratified ambient fluid as background, standard two equations k-s model is adopted. Vertical two-dimensional buoyant jet numerical model is set up. Finite volume method and SIMPLE algorithm are used to obtain the solution of the buoyant jet turbulent model. The object of the model is the experiment of buoyant jet in linearly density-stratified which is done by Derek, Raymond and Wong in 1984. Numerical simulation of horizontal buoyant jet and vertical buoyant jet in linearly density-stratified ambient fluid is performed, and obtained the distribution of velocity, density, dilution and width of the jet. The numerical simulation results are compared with test results, and they are agreed well with each other.The two-dimensional buoyant jet turbulent model established in this paper is comparatively well and truly simulates the behaviour of buoyant jet and the mixing characteristics in linearly density-stratified ambient fluid. It's valuable to study the characteristics of wastewater intrudes into the density-stratified ambient fluid. It can supply reliable analysis data for design of the project of wastewater discharge. It's an important technical measure to use the method of numerical simulation to study the mixing procedure of jets in density-stratified ambient fluid.