FLUENT 6 - Specifying a desired number of streams in a surface injection with the Discrete Phase Model that is different from the number of cell faces on the inlet surface


The domain in question has an inlet surface which is a wide opening with an arbitrary shape (not a regular rectangular surface). This surface has a large number of cell faces and is to be used as the injection surface with the particle streams distributed across the whole surface. The default method results in a very large number of injection streams (same as the number of cell faces) that would significantly increase computation time especially with the stochastic tracking option and a sufficient number of tries that is necessary for an erosion calculation. This solution describes an option available in the text interface of FLUENT that allows the user to specify a desired number of injection streams.
Using the text interface (TUI) command: surface/point-array, the user can specify two diagnal points to define a rectagular array with uniform abitrary number of streams for an injection. Once the point-array is defined, it will appear in the surface list for you to choose when using surface type injection. When defining a point-array big enough to cover the whole inlet area, FLUENT will automatically recognize the points within the computational domain. When specifying the particle flow rate, the flowrate will be uniformly distributed among the points only within the computational domain. This can be confirmed by doing DPM Sample and Histgram to the flowrate at the outlet. The total flowrate at the outlet should be equal to the specified value on the injection panel.





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