Transient Laminar Flow over a circular cylinder

bababanamzdaalma · February 29, 2012, 23:25

Hi All;

I am trying to simulate the flow over a circular cylinder in FLUENT. At Re=400 I am tring to show that the solution is grid independent. I want compare the mean drag coefficients but my simulation gives me a drag coefficient of 1.5 where the experimental data is 1.2-1.25. how can I improve my solution. I am using second order for everyting and the coupled solver.

nickvinn · March 1, 2012, 05:30

Do you perform 2D-simulations? According to Appl. Math. Model., 33, p.1228 (2009) mean drag coefficient for Re=400 is 1.39 for 2D and 1.05 for 3D-simulations. For the flow over circular cylinder 3D-effects like oblique shedding begin about Re=150 and persist even for very long cylinders (with aspect ratio over 100).

bababanamzdaalma · March 1, 2012, 13:37

Thanks for your concern. I am performing 2-d and compare the solutions with the Braza-1986. I his presented values in the paper is for 2-D numerical simulations.

February 29, 2012, 23:25	Transient Laminar Flow over a circular cylinder	#1
bababanamzdaalma New Member amgotsikmeme Join Date: Nov 2011 Posts: 6 Rep Power: 14	Hi All; I am trying to simulate the flow over a circular cylinder in FLUENT. At Re=400 I am tring to show that the solution is grid independent. I want compare the mean drag coefficients but my simulation gives me a drag coefficient of 1.5 where the experimental data is 1.2-1.25. how can I improve my solution. I am using second order for everyting and the coupled solver.

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March 1, 2012, 05:30		#2
nickvinn New Member Nikolay Vinnichenko Join Date: Nov 2010 Posts: 14 Rep Power: 16	Do you perform 2D-simulations? According to Appl. Math. Model., 33, p.1228 (2009) mean drag coefficient for Re=400 is 1.39 for 2D and 1.05 for 3D-simulations. For the flow over circular cylinder 3D-effects like oblique shedding begin about Re=150 and persist even for very long cylinders (with aspect ratio over 100).

March 1, 2012, 13:37		#3
bababanamzdaalma New Member amgotsikmeme Join Date: Nov 2011 Posts: 6 Rep Power: 14	Thanks for your concern. I am performing 2-d and compare the solutions with the Braza-1986. I his presented values in the paper is for 2-D numerical simulations.