NUMERICAL STUDY OF THE INFLUENCE OF THE AMBIENT-PRESSURE FIELD ON FREE PLANE TURBULENT VERTICAL JETS AND PLUMES

To help resolve the inconsistencies observed when examining measured p roperties of free plane jets and plumes, a numerical study was perform ed to determine the influence of a weak ambient motion and of the asso ciated pressure field on the flows of free plane vertical turbulent je ts and plumes. A nested grid control volume technique with the buoyanc y-extended kappa-epsilon model plane was used to model turbulent jets and plumes issuing into open spaces as well as into two-dimensional ro oms of various sizes. The results indicate that slight variations in t he ambient pressure distribution affect jet and plume development and similarity relationships.