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Problem in laminar natural convection in cavity

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Old   June 26, 2014, 06:06
Default Problem in laminar natural convection in cavity
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hi every one
i have modeled a 2d cavity in fluent and openfoam for natural convection heat transfer
they gave me the same results but not the same with the experimental results.
so i'm asking for your advices
the upper edge in cavity is adiabatic and left and right wall are in constant temp (Tc) and a part of lower wall is in constant temp(Th) and some part of it are adiabatic
i have attached the steps i used in modeling the problem in fluent and the results as well
i really need your helps because i;m about to fail my coarse!!!

thank you in advance
Nuextent.xlsx

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Old   June 26, 2014, 06:08
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the other steps
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Old   June 26, 2014, 08:44
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From density choose boussniq
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Old   June 26, 2014, 09:09
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Quote:
Originally Posted by Mohawk View Post
From density choose boussniq
i did but it converged with 3 iterations!!!!!!!!!!!!!!!!!!!!!
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Old   June 27, 2014, 05:10
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anyone ????
please
i need help!!
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Old   June 27, 2014, 09:55
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Make sure that Nusselt number is calculated the same way in simulation and experiment. Nusselt number in fluent is calculated as,

Nu = \frac{h_{eff} \cdot L_{ref}}{k}
with
h_{eff} = \frac{q}{T_{wall}-T_{ref}} .

q is the local heat flux, k is the local heat conductivity. The reference values are defined in the corresponding panel "reference values" in fluent (Length and Temperature).
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Old   June 27, 2014, 10:47
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Quote:
Originally Posted by kad View Post
Make sure that Nusselt number is calculated the same way in simulation and experiment. Nusselt number in fluent is calculated as,

Nu = \frac{h_{eff} \cdot L_{ref}}{k}
with
h_{eff} = \frac{q}{T_{wall}-T_{ref}} .

q is the local heat flux, k is the local heat conductivity. The reference values are defined in the corresponding panel "reference values" in fluent (Length and Temperature).
tanx for responding
i used Forward finite difference scheme for calculating Nu
Nu was defined as d(teta)/dY
teta is the dimensionless temperature
Y is the dimensionless lenght
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