Drag decreasing with decrease in temperature- Keeping Re and Mach same. why??? -- CFD Online Discussion Forums

June 27, 2021, 00:30	Drag decreasing with decrease in temperature- Keeping Re and Mach same. why???	#1
Usman Shahid New Member Usman Shahid Join Date: Dec 2020 Posts: 4 Rep Power: 6	Dear all, I am working on the validation of my cfd (using openFOAM) results on NACA0012. Experimental results are available at 0.3 Mach with 3.5 million Reynolds number. I am matching finding the properties of air by matching the Mach and Reynolds number by using expressions of Re, Ma, equation of state, and Sutherland's equation. For a particular temperature, I can find remaining properties of air such that Re, and Mach remains same. Now, if I decrease temperature, the values of Cd are decreasing. I am unable to understand that why is it so. CFD runs details: Mesh count: 83k (structured) Turb-Model: kw-SST Y+ : < 0.1 Convergence criteria: 10e-7 Kindly guide me in this regard, Thanks, Regards,

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