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how to calculate time averaged skin friction coefficient

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Old   May 25, 2016, 17:00
Default how to calculate time averaged skin friction coefficient
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how to calculate time averaged skin friction coefficient and time averaged pressure coefficient in fluent. I simulated cases of NACA 0012 at angle of attacks 0,1,2,,,30 . I have plotted skin friction coefficient by Fluent Results but it seems there is kind of problem. None of the plot showed any negativity in friction coefficient. Please somebody help
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Old   May 25, 2016, 18:07
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You'll need to store the time-averaged results by enabling "Data Sampling for Time Statistics" under Run Calculation. First, establish a developed flow (say the drag coefficient is oscillating or use a similar definition), and then enable the time statistics to capture the developed time-averaged solution.
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Old   January 28, 2017, 06:00
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Hi all,

I am puzzled with the calculation of time-averaged pressure coefficient. I am now running a case of turbulent flow past a cylinder. Where should it be calculated in a flow field? The formula in Wikipedia suggests that there should be some freestream pressure value in the numerator, namely (P-P_infinity). In my domain inlet pressure boundary is of Neumann type and outlet is at P=0. So, will someone please guide me?
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