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September 9, 2011, 03:00 |
Nozzle Entrainment
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Join Date: Sep 2010
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I've been trying to simulate entrainment into a domain by the action of a convergent nozzle. The nozzle jet blows perpendicular to the opening and air is sucked in simply by the pressure drop. The opening boundary condition is "Opening Pressure and Direction". The inlet is Total Pressure at 100 Pa.
However, I've encountered the issue where my CFX results of entrainment ratio (massFlow()@Opening/massFlow()@Inlet) are around 2x more than the the experimental results. This happens even if I create extremely small mesh sizes. I read that extruding the opening face away from the actual location helps, though I'm not sure how. I've also tried "entrainment" as the boundary conditions, but have encountered convergence issues so I've stopped using "entrainment" as the boundary condition. What are some advices that you could offer? Is it the boundary condition, mesh, or should I extrude the opening face further away? |
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