Can coefficient of drag value be as large as 14?

vasu · November 7, 2018, 08:40

Hi people,
I am new to Ansys Fluent, currently I am simulating the re-entry of a space module with following free stream conditions.

1. Inlet Mach number = 6
2. static pressure = 554.113 Pa
3. static temperature = 237.218 K

The data corresponds to atmospheric condition at an altitude of 35 km. The simulation I am doing is steady state. When residuals converge to value below 1e-03, I got coefficient of drag around 14. The reference conditions used for calculating the drag coefficient are:

1. Area = 1 m^2
2. Velocity = 1853.159 m/s

3. Density = 0.008137 kg/m^3

Can somebody tell me, is this value of drag coefficient is acceptable?

LuckyTran · November 7, 2018, 10:45

Is it right to use 1 m^2 for the reference area?

vasu · November 7, 2018, 12:10

Thank you sir! The area should be frontal area of the module.

November 7, 2018, 08:40	Can coefficient of drag value be as large as 14?	#1
vasu New Member Vasu S B Join Date: Sep 2017 Posts: 2 Rep Power: 0	Hi people, I am new to Ansys Fluent, currently I am simulating the re-entry of a space module with following free stream conditions. 1. Inlet Mach number = 6 2. static pressure = 554.113 Pa 3. static temperature = 237.218 K The data corresponds to atmospheric condition at an altitude of 35 km. The simulation I am doing is steady state. When residuals converge to value below 1e-03, I got coefficient of drag around 14. The reference conditions used for calculating the drag coefficient are: 1. Area = 1 m^2 2. Velocity = 1853.159 m/s 3. Density = 0.008137 kg/m^3 Can somebody tell me, is this value of drag coefficient is acceptable?

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November 7, 2018, 10:45		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,762 Rep Power: 66	Is it right to use 1 m^2 for the reference area?

November 7, 2018, 12:10		#3
vasu New Member Vasu S B Join Date: Sep 2017 Posts: 2 Rep Power: 0	Thank you sir! The area should be frontal area of the module.