Learning Forum

[Berker ÖZKARADUMAN]

I want to define a custom field function which includes dP/dx,dP/dy.I did the following 1.solve/set/expert n n yes no 2.İterate 1 iteration. Even though I have done previous 2 steps,I cannot see dP/dx contour in Fluent,it says that it is not defined in contours.How can I turn on pressure gradients.I want to define shock sensor which is dot_product(velocity vector, Pressure Gradient)/a*Magnitude(Pressure Gradient).I am using version 23.2 on linux.

[Rob]

dP/dx is in the Derivatives section of contours, and should be available. Are you using the pressure or density based solver? 

[Berker ÖZKARADUMAN]

I am using pressure based coupled solver.

[Berker ÖZKARADUMAN]

I export case data file.I import having completed analysis.However, derivatives are not available for custom field functions.Moreover,I  cannot see dP/dx in y plane contour.

[Rob]

Odd,

 

[Berker ÖZKARADUMAN]

((dp-dx*Vx))

I could see these variables from my case data file.However, it gives unknown calculator button dp when I write following equation(you can see in the picture).

 

[Rob]

What pictures? Please check as the Forum gremlins have been fairly hungry of late and keep eating things. 

[Berker ÖZKARADUMAN]

Due to size issue I cannot upload pictures.But I am writing.

Error Object

((dp-dx)*Vx)

Error:Unknown calculator button dp.

[Rob]

Odd, you should be able to screen grab & paste into the text

Works OK here. Did you pick the dp-dx from the menu or type it in?  CFFs are an older part of the code and have a few idiosyncrasies. 

[Berker ÖZKARADUMAN]

For the record, I cant monitor dp/dx contour.Maybe I should add someting on case dat file but I do not have any idea.

 

I supply you error picture.

I wrote /solve/set/expert n n y n

/solve/iterate 1 

.Then I get error in picture.