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air-fuel mixing in backward facing step

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Old   March 19, 2011, 19:39
Default air-fuel mixing in backward facing step
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Abdullah Karimi
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Hi guys,
I am trying to simulate air-fuel mixing in backward facing step....i m injecting hydrogen from bottom wall downstream the step. the injection condition is sonic and m using stagnation inlet in starccm+. The air inlet mach no. is 2. The problem diverges after some iterations. there is reverse flow at outlet sometimes.
plz comment on the probable cause of diverging.


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