How to monitor mass flow conservation and point velocity in .out files

yhddd · April 5, 2022, 07:23

I would like to monitor the difference in inlet and outlet mass flow, as well as the velocity values at some points, to judge convergence. I know it can be done using the Monitor function, but I am using a supercomputing platform and cannot view the Monitor curve. Someone knows how to write this data in .out file or output it to some file so that I can Monitor convergence.

Opaque · April 5, 2022, 08:24

I think you mean to monitor mass conservation, not convergence.

Nothing gets written to the output file unless is explicitly coded, so you must rely on the existing features. Have you checked the "expert parameters" panel in CFX-Pre.

There is a section for monitoring ranges, scales, etc. If I recall correctly there used to be a "monitor totals" that will output the same "end of simulation" report with all the equation flows and imbalances (it will make your output file a lot larger though)

ghorrocks · April 5, 2022, 19:18

You can monitor the imbalances/mass conservation in Solver Manager by adding a new monitor and selecting the imbalances you wish to monitor. You can also monitor velocities at points by defining a monitor point at that location in CFX-Pre and then you can monitor it in Solver Manager as the solution progresses.

yhddd · April 5, 2022, 22:06

Quote:

Originally Posted by ghorrocks

You can monitor the imbalances/mass conservation in Solver Manager by adding a new monitor and selecting the imbalances you wish to monitor. You can also monitor velocities at points by defining a monitor point at that location in CFX-Pre and then you can monitor it in Solver Manager as the solution progresses.

I am not calculating locally, but using a high-performance platform, so I cannot see the residual curve and the curve changes of the monitoring points. I know that the Monitor function can Monitor the point speed, but it can only display them in the form of curves, so I cannot see them

ghorrocks · April 5, 2022, 22:56

Solver Manager works fine on remote systems. As long as you can see the working directory Solver Manager will work.

An alternative method is to use the command line tools to extract the plots. I think the command is cfx5mon - but check the documentation for the syntax.

April 5, 2022, 07:23	How to monitor mass flow conservation and point velocity in .out files	#1
yhddd New Member hang yang Join Date: Apr 2022 Posts: 17 Rep Power: 4	I would like to monitor the difference in inlet and outlet mass flow, as well as the velocity values at some points, to judge convergence. I know it can be done using the Monitor function, but I am using a supercomputing platform and cannot view the Monitor curve. Someone knows how to write this data in .out file or output it to some file so that I can Monitor convergence.

April 5, 2022, 08:24		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	I think you mean to monitor mass conservation, not convergence. Nothing gets written to the output file unless is explicitly coded, so you must rely on the existing features. Have you checked the "expert parameters" panel in CFX-Pre. There is a section for monitoring ranges, scales, etc. If I recall correctly there used to be a "monitor totals" that will output the same "end of simulation" report with all the equation flows and imbalances (it will make your output file a lot larger though) __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

April 5, 2022, 19:18		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You can monitor the imbalances/mass conservation in Solver Manager by adding a new monitor and selecting the imbalances you wish to monitor. You can also monitor velocities at points by defining a monitor point at that location in CFX-Pre and then you can monitor it in Solver Manager as the solution progresses. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

April 5, 2022, 22:56		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Solver Manager works fine on remote systems. As long as you can see the working directory Solver Manager will work. An alternative method is to use the command line tools to extract the plots. I think the command is cfx5mon - but check the documentation for the syntax. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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