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Old   October 15, 2008, 05:47
Default drag coefficient fluent
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Hi, i'm simulating the flow arouand an axisymmetric body and i have to compare CFD results with experimental ones. I need to know how Fluent calculates the drag coefficient, on what does it bases Cd, on the length of the axis or what? thank you Franceso
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Old   October 15, 2008, 11:20
Default Re: drag coefficient fluent
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you can simply use report/forces, and set the drag force direction to get the drag coefficient. also you can get it from solve/monitor,... the reference values, as reference area,... are defined in report/reference values, and you can set the desired value.
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Old   February 15, 2010, 09:59
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Hi guys, i'm tring to calculate the drag force coefficient in a 3-d case and the fluid is behind a cylinder.
the fluid is:
density = 800 kg/m^3
dinamic viscosity = 0.005 kg/ms
velocity = 8 m/s

the cylinder is:
diameter = 13 mm
length = 300 mm
stiffness modulus = 200000 MPa
poisson coefficient = 0.3

to calculate the drag coefficient i push: solve/monitors/force/drag coefficient.....
the direction of the vector of force is in parallel to the flow flowing

i set the reference value:
Area = 0.013*0.3 that is the product for diameter and the length of the cylinder,
Length = 0.013 that is the diameter
then i set other values: viscosity, velocity, density of fluid as i wrote upforward.

i put 90 nodes around the circonference of the cylinder, and 25 along to the length of the cylinder.

the algorytm used is LES, because this is a 3d case
I used PISO
and second order upwind for momentum...

the Cd value is incresing but after 0.02 seconds it is still to 0.7.

How can i do, please help me.
Thank to all
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