Learning Forum

[AlfredOloo]

Hi, 

I have run a CFD simulation using FLUENT on an airfoil for pressure distribution as shown in the picture below. 

On the other hand, I do not understand the NEGATIVE PRESSURE values of as shown in the legend, why do I have negative pressure?

And what is this pressure: total, static, gauge, etc

[Amine Ben Hadj Ali]

Look into absolute pressure.

[RK]

Hello, 

Plot velocity vectors too for better understanding of negative pressure. Refer to the Fluent Theory guide for the definitions: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_th/flu_th_sec_compressible_physics.html?q=total%20pressure

[AlfredOloo]

Seems like it is absolute pressure.

Thank you

[Amine Ben Hadj Ali]

What do you mean?

[AlfredOloo]

Hi,

I mean the pressure values given here seem to be absolute pressure and not gauge. Am I right?

[Amine Ben Hadj Ali]

Please check the absolute pressure in Fluent whether is negative or not.