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Natural/Free Convection over flat plate

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Old   April 7, 2013, 10:49
Default Natural/Free Convection over flat plate
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Allen Doss
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Hello everyone,
I need help solving a problem on fluent.
Free convection over a vertical flat plate with non uniform heat flux
Initially i'm doing it for constant heat flux..All done using ansys fluent

1.Geometry:rectangle-0.3m by 1m
2.Mapped mesh:3000 cells
3.Boundary conditions:
plate-1000w/m2,(on the left)
top- pressure outlet ,0 gauge pr..temp 300k
bottom- pressure inlet ,0 gauge pr..temp 300k
far-symmetry(on right)

I`ve got the temperture contour ,which looks ok..but im unable to get the correct velocity profile on the chart
location of line for velocity profile-(0.001,1) (0.001,1)
X axis-velocity u
Y axis-Y..
please help..
ini.png

initial.jpg

velocity.jpg

mesh.jpg
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Old   April 9, 2013, 01:12
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Emon P
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Hi, I think the problem is that you didn't define the properties of airs.
In natural convection, the density should be defined boussinesq approximation, and also don't forget edit Thermal Expansion Coefficient.
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Old   April 9, 2013, 05:48
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Quote:
Originally Posted by Dorasemon View Post
Hi, I think the problem is that you didn't define the properties of airs.
In natural convection, the density should be defined boussinesq approximation, and also don't forget edit Thermal Expansion Coefficient.
Hello,
When we choose boussinesq and thermal expansion coefficient, Fluent initialize a value at 0. Should we let the default value ?

Thanks very much
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