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-   -   reversed flow in over-expanded supersonic nozzle (http://www.cfd-online.com/Forums/fluent/115338-reversed-flow-over-expanded-supersonic-nozzle.html)

imnull March 28, 2013 11:48

reversed flow in over-expanded supersonic nozzle
 
hi All,
got a headache with convergence of the solution because of reversed flow.

i do have over-expanded supersonic nozzle where the back-flow presents at the end of the nozzle wall.

pressure inlet- 6 bar (means 5 bar as gauge pressure) + To- 800K
pressure outlet- 1 bar (absolute) + To- 300K
reference- 1 bar

tried first order, solution steering, limits. nothing helps... once I got reversed flow the solution is down..

NB: have no problem with the same nozzle in CFX (using the opening at the outlet). The reason I'd like to use Fluent is because of the CUT-CELL mesh.

Any suggestion or ideas on how to get rid of the reversed flow at the end of the nozzle wall? pls help.


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