# drag coefficient fluent

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 October 15, 2008, 05:47 drag coefficient fluent #1 Francesco Guest   Posts: n/a 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

 October 15, 2008, 11:20 Re: drag coefficient fluent #2 doki Guest   Posts: n/a 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.

 February 15, 2010, 09:59 #3 New Member   alessio Join Date: Nov 2009 Posts: 5 Rep Power: 8 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. Alessio Thank to all

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