Why my calculation of Mach number is not the same as fluent

ranxiaoran · August 30, 2021, 10:24

Hello, everyone. I have a problem when I want to verify my inlet data on the supersonic fluid.
I use the equation “Mach number = Velocity / (1.4 * R * static temperature)”, and what amazing me is that when I substitute the following data into the equation, I find the Mach number is 2.4970 (R is 287.15 for air), but fluent shows that the mach number is 2.439456. So I wonder why this happens and how to get the real answer as fluent？

Thank you in advance!

ranxiaoran · August 30, 2021, 10:50

Now I understand why , this because it uses the average number, I don't know how to delete this post, thank you for you reading.

August 30, 2021, 10:24	Why my calculation of Mach number is not the same as fluent	#1
ranxiaoran New Member iiran Join Date: Jul 2021 Posts: 21 Rep Power: 5	Hello, everyone. I have a problem when I want to verify my inlet data on the supersonic fluid. I use the equation “Mach number = Velocity / (1.4 * R * static temperature)”, and what amazing me is that when I substitute the following data into the equation, I find the Mach number is 2.4970 (R is 287.15 for air), but fluent shows that the mach number is 2.439456. So I wonder why this happens and how to get the real answer as fluent？ Thank you in advance!

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August 30, 2021, 10:50		#2
ranxiaoran New Member iiran Join Date: Jul 2021 Posts: 21 Rep Power: 5	Now I understand why , this because it uses the average number, I don't know how to delete this post, thank you for you reading.