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Abstract
To help resolve the inconsistencies observed when examining measured properties of free plane jets and plumes, a numerical study was performed to determine the influence of a weak ambient motion and of the associated pressure field on the flows of free plane vertical turbulent jets and plumes. A nested grid control volume technique with the buoyancy-extended k-e model plane was used to model turbulent jets and plumes issuing into open spaces as veil as into two-dimensional rooms of various sizes. The results indicate that slight variations in the ambient pressure distribution affect jet and plume development and similarity relationships.