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-   -   hydraulic diameter (http://www.cfd-online.com/Forums/fluent/81181-hydraulic-diameter.html)

saha2122 October 19, 2010 06:59

hydraulic diameter
 
hi every body :)!!
i have a 3d geometery ! i define the 3 faces , as inlet ! they are exactly similar[rectangular (14.7* 7.5] !!!!!!!!!!! but when i wanna import the hydraulic diameter in fluent , i dont know that i should import Dh of one of them, or i should import 3Dh:eek:??[ i cant define them seprately !!! because i have total mass flow inlet:rolleyes:]



:):)SaHa:):)

-mAx- October 20, 2010 01:43

if Q is your total massflow, then generate 3 maflow inlet, with Q/3 each

saha2122 October 20, 2010 10:30

hi dear mAx !!
i cant use Q/3:confused:! because each cannal has different Q :eek: !!!!!!!!!!!! and that is because of the downstream effect !! [ i only have Q !!]



:):)SaHa:):)

-mAx- October 22, 2010 02:48

if you choose the 3 faces as one inlet, fluent will automatically dispatch the massflow uniformally since the 3 faces have same section. So you will have Q/3 at each intake.

saha2122 October 23, 2010 09:07

hi dear mAx!:)
then u mean that fluent cant understand the effect of down stream ! ya?
because the results of experimental tests, show different mass flow rate in each cannal :rolleyes:!!!!

also , the other question :
how can i seperate these planes in fluent? i used surface\plane but i think it uses a infinite plane that cut my geometery in 3 cross section , again!!:o

what should i do?:confused:

-mAx- October 25, 2010 02:57

the Boundary conditions are given from you. You impose it.

Return in Gambit, and select each intake surface as separated BC (inlet 1, inlet 2, inlet 3)


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