# How to define a fixed velocity for a given mass flow rate on inlet

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 April 12, 2013, 02:13 How to define a fixed velocity for a given mass flow rate on inlet #1 New Member   Qasim Ali Join Date: Mar 2013 Location: Islamabad, Pakistan Posts: 18 Rep Power: 6 Sponsored Links hello, I am simulating a turbulent flow through a vertical channel with some sort of blockage. its mass flow rate at inlet is 0.3 kg/s using mass flow rate = density* area* velocity for inlet i come up inlet velocity as 2.4 m/s that is reasonable... but when i step into fluent, i defined the mass flow rate exactly in vertical channel but inlet velocity is jumped up to 80m/s how to fix this inlet velocity??? i am only defining the mass flow rate, rest i initialize the value from inlet that takes velocity in 80s, even if i keep it down but fianl form after iteration makes it deviate again. in other words i want fixed velocity at inlet. help me out. thankyou

 April 12, 2013, 02:17 #2 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 998 Rep Power: 17 I think your solution is not converged, that's why your velocity field and other variables are wrong. Daniele

 April 12, 2013, 17:24 #3 New Member   Qasim Ali Join Date: Mar 2013 Location: Islamabad, Pakistan Posts: 18 Rep Power: 6 i tried different grids to check their independence, all yielded results in same pattern and it stops the results with comment solution is converged

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