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Lower Lift coefficient value

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Old   December 12, 2020, 03:05
Default Lower Lift coefficient value
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Hi,
Iam carrying out 2D unsteady simulations of single circular cylinder in Fluent with air as working medium, with Pressure based transient solver.
The drag and lift coefficient are not matching with the reference journal values for Reynolds number of 1.3E4, the reported values are drag coefficient as 1.03 and lift coefficient around 0.8.

Whereas for 2D steady state simulations of single cylinder, drag coefficient is 1.03 and lift coefficient is 0.2 is obtained from simulations.
Below are the setup details in fluent

Details :
1) Domain size : 100x30cm
2) Meshing done in ICEM CFD.
3)Reference values:
Diameter of cylinder(d) -- 0.01m
Area (=Pi*d*d/4) = 7.8525e-05 m2.
Length and Depth = 0.01m
5)Boundary conditions:
Inlet velocity - 20m/s
Outlet - zero gauge pressure

Please provide suggestions, to match the drag and lift values for 2D and 3D cases.
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Old   December 12, 2020, 05:53
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Quote:
Originally Posted by goutamp View Post
Hi,
Iam carrying out 2D unsteady simulations of single circular cylinder in Fluent with air as working medium, with Pressure based transient solver.
The drag and lift coefficient are not matching with the reference journal values for Reynolds number of 1.3E4, the reported values are drag coefficient as 1.03 and lift coefficient around 0.8.

Whereas for 2D steady state simulations of single cylinder, drag coefficient is 1.03 and lift coefficient is 0.2 is obtained from simulations.
Below are the setup details in fluent

Details :
1) Domain size : 100x30cm
2) Meshing done in ICEM CFD.
3)Reference values:
Diameter of cylinder(d) -- 0.01m
Area (=Pi*d*d/4) = 7.8525e-05 m2.
Length and Depth = 0.01m
5)Boundary conditions:
Inlet velocity - 20m/s
Outlet - zero gauge pressure

Please provide suggestions, to match the drag and lift values for 2D and 3D cases.
Hi,

you can put the value of diameter in the area and length
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Old   December 12, 2020, 09:09
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duri
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The lift coefficient in the cylinder is too high. What is the source of circulation. Since this is an unsteady which quantity are you trying to match, is it average. What about time variation of lift and drag.
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Old   December 12, 2020, 17:31
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yes
while calculating time histories for force coefficients, fluent uses reference area, for your case you have a cylinder, you can put cylinder diameter in reference area dialog
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