Why does my simulation have a higher pressure drag than friction drag?

Project Support
1

Hello.

I understand that friction drag is greater than pressure drag in streamlined type such as airfoil.

However, in my simulation, the pressure drag(pressure force z) is greater than the friction drag(viscous force z). The pressure drag is greater even when simulated with other airfoil models.
Why are these results coming out?

2

Hi there, actually it is expected that the pressure drag is greater than the viscous drag here.

Have a look at the following external aerodynamics tutorial for example:

Compressible Flow Around a Wing | Tutorial | SimScale
https://www.simscale.com/workbench/?pid=6165224041496522674&rru=de27b55a-95e4-4839-a423-0ac94e98fc0b&ci=03a90ad7-6234-4960-9881-ef87962521b8&ct=PLOT&mt=SIMULATION_RESULT

Best regards,
Fillia