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Junction Box Routine - Proper path definition

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Old   January 15, 2016, 05:34
Default Junction Box Routine - Proper path definition
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Hi everyone,

I'm trying to implement a Junction Box Routine and I'm using the template and tutorial from section 18 in the help section. However I think there is a mismatch between how they define their path and how I should implement it.

My fortran file is exactly the same as the file in section 18 but it crashes pretty much in the beginning and produces the following OUT file error.

Details of error:-
Error detected by routine PEEKCS

Current Directory :/
I defined INPUT_FILE in the command editor and the out file does show it but I suppose I'm not referencing it right with respect to file hierarchy. And does the folder USER need to be created anywhere prior?

I run CFX pre from the bench where I have defined a working directory. Should I consider that directory home? Or is it the literal home in my desktop?
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Old   January 15, 2016, 06:04
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The /USER/ or /USER_DATA/ folder are within the Memory Managment System (MMS) of CFX and you can not access it directly. They are used to store variables which need to be accessed by the solver.
And yes, the folder need to be created beforehand with the PSHDIR (folder) and MAKDAT (variable) command.
But it should be all described in the tutorials. Be sure, that the path of the compiled Fortran files is set correctly in CFX-Pre and that you have actived the junction Boxes in the solver Tab.
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Old   March 7, 2018, 08:26
Default Junction box routine
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Hi all
I want to set up a simulation in Ansys-cfx with user Junction Box Routine(in Fortran). This JBR is called at the end of each timestep in order to get the the velocity field components (for special area), treat them and inject them again into the solver for the next time step.So, my question is exactely how can a user fortran routine deal (get ,inject...) with the velocity field components every timestep. Please I need your help or a tutorial for this special purpose
Thanks for all
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Old   March 7, 2018, 16:37
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Glenn Horrocks
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This sounds like a very dangerous thing to do. Why can't you use a source term or something like that to do it?

You are going to need a detailed knowledge of the MMS to do what you propose, the tutorials available will not cover that.
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
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fortran code, junction box

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