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How to print solver info. every N steps to screen (e.g.Terminal)?

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Old   October 18, 2021, 10:36
Question How to print solver info. every N steps to screen (e.g.Terminal)?
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David Long
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Dear Foamers,

I don't want see the OF solver screen-info. every step. Instead, let the solution info. to be printed to screen every N steps. How to achieve this?

I know that we can switch off those screen info. in the OF's global controlDict (1 to 0):

Code:
$HOME/OpenFOAM/$WM_PROJECT_VERSION/controlDict

SolverPerformance   1;
lduMatrix           1;
I was wondering, is there anyway we can keep these options on, and make them run in *interval*? In case if Courant number or any important scalar/vector_magnitude exceed their limits, we force the OF solver to print details to screen. I think this would reduce some CPU usage, and get ride of redundant screen output info.

Last edited by keepfit; October 18, 2021 at 15:06.
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Old   October 23, 2021, 12:56
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I don't know if it is possible or not to achieve that via tweaking of the global controlDict or switches. One way I can think of is, to disable the output then use a function object to print that information.

Maybe using something like solverInfo function object? you can then change the writeInterval of that FO accordingly.

Of course, You can also achieve that using a custom function object/coded function object.
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Old   October 25, 2021, 01:08
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Quote:
Originally Posted by s1291 View Post
I don't know if it is possible or not to achieve that via tweaking of the global controlDict or switches. One way I can think of is, to disable the output then use a function object to print that information.

Maybe using something like solverInfo function object? you can then change the writeInterval of that FO accordingly.

Of course, You can also achieve that using a custom function object/coded function object.
thanks for the hint!

Actually I am coding a new CFD framework that is compatible with OF in terms of high level syntax, but the low level ( fv discretization, field interpolation, BCs and sparse linear system ...) functionaries are written with pure C++17 data structure/STL. The Ax=B is solved by third-party linear solvers (e.g. Petsc). By doing this, I will be finally free of OF's overly-complicated APIs after so many years headache , and could 100% focus on actual algorithms .
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