# What does 'Calculated' Boundary Condition Mean in 0/nut file ?

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 August 27, 2014, 10:23 #1 Member   Pratik Nanavati Join Date: May 2014 Location: Munich, Germany Posts: 40 Rep Power: 5 Hello All, I am confused about the usage and meaning of, Calculated BC. in many OF Tutorials it has been used in 0/nut file for inlet and outlet. Can anyone please throw some light on it. Many Thanks. Last edited by wyldckat; September 24, 2014 at 15:23. Reason: repeated posts in 2 different threads

 August 27, 2014, 10:33 #2 Member   Join Date: Jun 2011 Posts: 53 Rep Power: 8 Hello nanavati, calculated means, that the property you are referring to is already fully defined by the other boundary conditions and properties you defined in the constant folder. For example nu_t (or mu_t) is defined via k and epsilon by nu_t= C * k^2/epsilon So OpenFOAM can calculate the boundary conditions for nu_t via the ones you gave it for k and epsilon. You only specify the wall-function for nu_t. Regards Squirrel mizzou likes this.

 August 28, 2014, 03:54 #3 Member   Pratik Nanavati Join Date: May 2014 Location: Munich, Germany Posts: 40 Rep Power: 5 Many Thanks for the Detailed Explanation.

 September 8, 2014, 10:15 #4 Senior Member   Tom Fahner Join Date: Mar 2009 Location: Delft, Netherlands Posts: 367 Rep Power: 14 It means the values are calculated from the turbulence model and the values for k and epsilon (or omega) and not prescribed. Regards, Tom

 July 28, 2016, 05:43 #5 Member   annn Join Date: Jun 2016 Posts: 40 Rep Power: 3 but how come it makes us specify a value? by default it is just zero is that just like a place holder for when the value is calculated?

 July 28, 2016, 06:37 #6 Member   Join Date: Jun 2011 Posts: 53 Rep Power: 8 Hi cleoo, You are right, the value for the calculated boundary patch field is just a place holder. The description text of "calculatedFvPatchField.H" states, that the value entry is optional. Code: ``` myPatch { type calculated; value uniform (0 0 0); // optional value entry }``` Regards Squirrel mizzou likes this.

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