|
[Sponsors] |
What does 'Calculated' Boundary Condition Mean in 0/nut file ? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
August 27, 2014, 10:23 |
|
#1 |
Member
Pratik Nanavati
Join Date: May 2014
Location: Munich, Germany
Posts: 40
Rep Power: 12 |
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: 14 |
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 |
|
August 28, 2014, 03:54 |
|
#3 |
Member
Pratik Nanavati
Join Date: May 2014
Location: Munich, Germany
Posts: 40
Rep Power: 12 |
Many Thanks for the Detailed Explanation.
|
|
September 8, 2014, 10:15 |
|
#4 |
Senior Member
|
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: 9 |
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: 14 |
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 } Squirrel |
|
May 9, 2019, 09:17 |
|
#7 |
Senior Member
krishna kant
Join Date: Feb 2016
Location: Hyderabad, India
Posts: 133
Rep Power: 10 |
Hello All,
I have a question. How is nut calculated in dyanmicKEqnModel. Is there any good description on dynamicKEqnModel? Thanks |
|
August 1, 2020, 12:42 |
The problem of dynamickequation
|
#8 | |
Member
Guanjiang Chen
Join Date: Apr 2020
Location: Bristol, United Kingdom
Posts: 54
Rep Power: 6 |
Quote:
Do you have some problems in dynamickequation model? when I use it to calculate the flow through cylinder. I find that the value of nut will close to 0, and then the float point exception problem will happen. Sincerely, Guanjiang |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[swak4Foam] Swak4FOAM 0.2.3 / OF2.2.x installation error | FerdiFuchs | OpenFOAM Community Contributions | 27 | April 16, 2014 15:14 |
[swak4Foam] Error bulding swak4Foam | sfigato | OpenFOAM Community Contributions | 18 | August 22, 2013 12:41 |
Question about heat transfer coefficient setting for CFX | Anna Tian | CFX | 1 | June 16, 2013 06:28 |
Error finding variable "THERMX" | sunilpatil | CFX | 8 | April 26, 2013 07:00 |
error while compiling the USER Sub routine | CFD user | CFX | 3 | November 25, 2002 15:16 |