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-   -   Does fluent calculate reversed flow situations more simply than it should? (http://www.cfd-online.com/Forums/fluent/121938-does-fluent-calculate-reversed-flow-situations-more-simply-than-should.html)

heksel8i August 8, 2013 09:03

Does fluent calculate reversed flow situations more simply than it should?
 
Hey!

I have a case where I am expecting reversed flow (nozzle expansion with pressure outlet on all the boundaries around the nozzle domain) and I tried to look for an explanation that does this reversed flow create inaccuracy to my simulation. Basically according to simple Fluent manual description it shouldn't but my University's CFD-teaching slides say that it is probable that Fluent makes simplifications when reversed flow situation is encountered. Any idea what actually happens when reversed flow occurs?

Of course back-flow boundary conditions are not accurate (not taken from the adjacent cells) so at least this creates inaccuracy for reversed flow situation...


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