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Reverse flow at the outlet

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Old   March 30, 2016, 04:31
Default Reverse flow at the outlet
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muhamed
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Hi.
I have a problem with the reverse flow at the outlet of my geometry. I am doing a simulation to determine the water drag force on a pier inside a channel using FLUENT. I want to get the results for a Laminar flow (v=0.0001 m/sec). the simulation is going well but the drag force I got is negative, that means the reverse flow affecting on the results. I increased the elements density and I changed the geometry to be as shown in the attached picture and made the outlet far from the pier and I decreased the time step size but I still get the reverse flow warning messages. I read all the comments in this site about this problem and i did all what were suggested but unfortunately, the problem stills unsolved. Any tips please?
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File Type: jpg Pier.jpg (77.1 KB, 7 views)
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backflow, negative drag force, reverse flow

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