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over predicting at inlet with k omega SST

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Old   November 19, 2018, 15:51
Default over predicting at inlet with k omega SST
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mehran mohammadi
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hello there
I'm trying to do an internal flow computation. my geom is a simple pipe that flow inter from one side and go out from another side (geom was attached bellow) I'm using k omega SST model in fluent . and there is my other condition:
my solver is steady pressure based, Yplus<1 , using a coupled scheme for pressure velocity coupling (courant number is set to 20) and ideal gas as a fluid . i used mass flow and inlet velocity would arrived to 120m/s therefore i set operating pressure to 0 and use a total pressure at inlet(115000pa) and outlet(110000pa). my wall temperature is 500k and inlet temperature is 350 . i used pressure outlet for outlet boundary and .
my mesh condition is :
i used o grade and
quality : 0.7
max skew : 0.25
max aspect : 98
and there is my NU contour was attached bellow my solve is converged to 1e-05 but i have an over prediction at inlet i dont know why?? could anyone help me please?
p s : if i use course mesh at wall and use a wall function i wouldn't have this problem but because of some reason i should do it with k omega
thank for any hints


geom.jpg

nus conture.jpg

Last edited by mehran.mo; November 20, 2018 at 15:40.
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fluent, k omega, k omega sst, massflow bc, overpredicting

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