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-   -   How to define a fixed velocity for a given mass flow rate on inlet (http://www.cfd-online.com/Forums/fluent/116059-how-define-fixed-velocity-given-mass-flow-rate-inlet.html)

mqasimali April 12, 2013 02:13

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

ghost82 April 12, 2013 02:17

I think your solution is not converged, that's why your velocity field and other variables are wrong.

Daniele

mqasimali April 12, 2013 17:24

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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