Learning Forum

[ZiWen Yin]

In fluent, why is the pressure coefficient greater than 1 when incompressible fluid with constant density is used for calculation

[Rob]

Have a look at the definition of pressure coefficient in the manual: then tell me why it's not what you expect. 

[ZiWen Yin]

In fluent，What is the definition of pressure coefficient by fluent，Is the difference between the local static pressure and the far-field static pressure divided by the far-field dynamic pressure？By definition. Its value cannot be greater than 1，In my case, this value is greater than 1，I calculate the far-field velocity of multiple different points with pressure coefficient greater than 1 in the flow field，It is found that they seem to have the same far-field velocity，but not the speed I set for the Velocity inlet，I'm sure my reference values are correct. So, what is the definition of pressure coefficient by fluent, In particular, what is fluent's definition of far field velocity. Sorry, I didn't find the relevant instructions in the help guide.

[Rob]

The definition is in the manual, https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v222/en/flu_ug/flu_ug_fvdefs.html  you'll need to open Help from the solver before using the link.