Computation of three-dimensional turbulent flow in non-orthogonal junctions by abranch-coupling method

Abstract A finite-volume procedure is introduced for calculating the 3-D turbulent flow in complex junctions consisting of a main duct and a side branch which may intersect at any angle. Any combination of flow directions in the junction ducts can be accommodated, and regions of separation are permitted. The procedure is folmulated with economy of storage being an important consideration. A characteristic feature of the scheme is a quasi-uncoupled, zonal treatment of the main duct and the side branch, whereby each is covered by a separate non-orthogonal mesh and computed separately. Coupling is then achieved iteratively within the overall solution process. Regions of separation are treated by means of “elliptic” patches embedded within a “partially parabolic” flow domain. The capabilities of the schemes are demonstrated through comparisons between computations and experimental LDA data for a range of laboratory junction flows. The procedure is then applied to practical junctions used in real IC-engine manifolds.

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