ERROR: For flow condition "X" dataset "pressure", the number of times is excessive for synchronization with waypoints

[Adam Haynes]

Hi Glen,

I am trying to run a 10-year simulation with hourly time steps and am getting the error below:

ERROR: For flow condition "precipitation" dataset "pressure", the number of times is excessive for synchronization with waypoints.

I had a similar issue to this in the post below:

https://groups.google.com/g/pflotran-users/c/Hd0OSyimke0/m/2QJ7PgiBCAAJ

However, this time I am using a CYCLIC input, so I am not sure what else might be the issue. I've tried making all my other inputs hourly as well, and that has not worked. It could be the number of constraints that I have (hourly salinity data)? 

Attached is the input deck and precipitation dataset. Also, if you see anything else that could be simplified, feel free to mention it.

Thanks for any help!

Adam

[Hammond, Glenn E]

Adam,

 

Please send me the input file so that I can test the precipitation flow condition.

 

Glenn

 

From: 'Adam Haynes' via pflotran-users <pflotra...@googlegroups.com>
Date: Tuesday, June 17, 2025 at 12:37 PM
To: pflotran-users <pflotra...@googlegroups.com>
Subject: [pflotran-users: 8439] ERROR: For flow condition "X" dataset "pressure", the number of times is excessive for synchronization with waypoints

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[Adam Haynes]

Hi Glenn,

It seems as if the .in file is 'too long' to post here. I sent it in an email. 

Thanks,

Adam

[Bisesh Joshi]

I  also have a similar issue when using hourly precipitation data for 2 years in cyclic as a top boundary Neumann flux.

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Bisesh Joshi

PhD student

Water Science and Policy

Graduate College

University of Delaware

901-297-6761

[Chuyang Liu]

Echo with a similar issue by using a daily cyclic Neumann flux boundary at the top.

[Hammond, Glenn E]

Adam,

 

The total runtime of the simulation is 10 years or 87,599 hours. PFLOTRAN prints the error message when the number of entries (times) listed in a flow condition is greater than 20,000:

 

https://bitbucket.org/pflotran/pflotran/src/664b02033c3e403ecccca7c7530b2f5ca978bff0/src/pflotran/realization_subsurface.F90#lines-1809

 

The workaround is to increase 20000 to ~90000 and recompile PFLOTRAN. The transport side does not perform this check.

 

Bisesh and Chuyang,

 

If your input decks list 20K+ entries for a transient flow condition, the same issue will occur. Try increasing that integer value to a value slightly greater than the number of entries.

 

Another option is that I make the maximum value in the conditional (i.e., the hardwired 20K) a user defined number and force the user to acknowledge that the simulation initialization may take too long or the simulation may run out of memory (both machine dependent).

 

Glenn

 

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