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2D turbulent flow around Bluff Body convergence issues

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Old   June 24, 2015, 15:00
Thumbs up 2D turbulent flow around Bluff Body convergence issues
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Hello,

I am currently running a 2D transient simulation of turbulent flow over 2 inline bluff bodies. I am using realizeable k-e method, and dynamic mesh smoothing. I have a structured grid which I believe to be adequate for my model but when I am running my simulation for 100 time steps and I am seeing some odd things with my residuals.The energy will drop quickly to about 1e-16 but the x and y settle down to 1e-3 and don't go any lower. The continuity will go no lower than 1e-2 and will spike every timestep before settling down as the iterations continue. The flow behaves the way experimental data has shown it to I am just unsure as what the best way to go about improving these residuals would be (specifically the continuity). I checked the residual contours and I see a large mass imbalance on my outlet boundary. Could this be part of the issue?
Any advice on the matter would be greatly appreciated. Thanks!
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