How to read pressure drag and frictional drag

Scramjetdk · February 3, 2022, 22:29

Hello everyone
I am tring to seperate drag into pressure drag and frictional drag. But I cannot find any of them.
My history output only have CD, CL, CSF, CM(x, y, z), CF(x,y,z),CEff. To be honest，I even have no idea what does the CSF and CEff mean.

Thank you if you know any of these questions, hope you all are doing fine and happy 2022.

jdp810 · February 7, 2022, 04:19

Hi,

If you write WRT_FORCES_BREAKDOWN= YES in the config file you should get a file called forces_breakdown.dat and you'll see the pressure/viscous forces separation.

CSF is the Side Force Coefficient, but I am not sure what CEff stands for

pcg · February 7, 2022, 05:40

It's the efficiency coefficient, CL / CD

February 3, 2022, 22:29	How to read pressure drag and frictional drag	#1
Scramjetdk New Member Zhenkai Zhang Join Date: Oct 2019 Posts: 3 Rep Power: 6	Hello everyone I am tring to seperate drag into pressure drag and frictional drag. But I cannot find any of them. My history output only have CD, CL, CSF, CM(x, y, z), CF(x,y,z),CEff. To be honest，I even have no idea what does the CSF and CEff mean. Thank you if you know any of these questions, hope you all are doing fine and happy 2022.

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February 7, 2022, 04:19		#2
jdp810 Member Jose Daniel Join Date: Jun 2020 Posts: 36 Rep Power: 5	Hi, If you write WRT_FORCES_BREAKDOWN= YES in the config file you should get a file called forces_breakdown.dat and you'll see the pressure/viscous forces separation. CSF is the Side Force Coefficient, but I am not sure what CEff stands for

February 7, 2022, 05:40		#3
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 466 Rep Power: 13	It's the efficiency coefficient, CL / CD