Posted Fri, 13 Jan 2023 12:34:10 GMT by Tiago Pessoa WST
Hello, I am working with piChem and have three questions. First, is there a way to disable certain nodes on the selection P4F user data so that they are not included in the PyChem calculations in order to increase performance? Second, when I ran some tests with my model, I received the following error message: 'PHREEQC chemical reactions (piChem)::OnTimeStepConstraint(): Invalid time step length!' I have tried disabling the time series and using time series with values of 0.0001 [d] and others with 1000 [d], but this message continues to appear. Third, is there a way to automatically link the Boundary Conditions and the Initial conditions without using the GUI provided by piChem? I want to create one file for each node on my model, approximately 79,000 nodes, maybe using Python to send that link information to piChem.

Posted Fri, 13 Jan 2023 12:55:17 GMT by Juan Azevedo

Can you please provide an answer to this question as well, as I am also in need of the information.

Posted Fri, 13 Jan 2023 14:26:57 GMT by Juan Navarro WST
Hello Tiago,

Maybe the error message from time step length could be related to some incongruence between your time series and the constrain you assumed, or even with some other configuration of time step control menu. Have you already checked any of these?
Posted Tue, 24 Jan 2023 15:33:17 GMT by Carlos Andres Rivera Villarreyes Global Product Specialist - FEFLOW
Hi Tiago,<br> If you like to discard nodes to the coupling with PHREEQC, the only workaround is to use Inactive Elements. Although, this will inactivate all these nodes entirely from the flow and mass transport calculations.<br> Regarding to the error message with the OnTimeStepConstraint, it is something unknown to DHI. I recommend you to contact us via support.<br> Finally, the automation of files used in the pIchem GUI is not supported.<br> Cheers<br> Carlos

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