error msg

[ashutosh singh]

Hi!

This is the message I got while using the PCGN solver

CELL CONVERSIONS FOR ITER.=  7  LAYER=  5  STEP=  1  PERIOD=   1   (ROW,COL)

   DRY(  328,  489)DRY(  328,  490)DRY(  328,  491)DRY(  328,  492)DRY(  328,  493)

   DRY(  328,  494)DRY(  328,  495)DRY(  329,  497)DRY(  329,  498)DRY(  329,  499)

   DRY(  330,  500)DRY(  331,  501)DRY(  331,  502)DRY(  332,  502)DRY(  332,  503)

   DRY(  333,  503)DRY(  334,  504)DRY(  335,  486)DRY(  335,  505)DRY(  336,  486)

   DRY(  336,  506)DRY(  337,  486)DRY(  337,  506)DRY(  338,  486)DRY(  339,  507)

   DRY(  340,  507)DRY(  345,  507)DRY(  346,  486)DRY(  349,  490)DRY(  349,  509)

   DRY(  352,  511)DRY(  353,  491)DRY(  354,  491)DRY(  355,  491)DRY(  358,  516)

   DRY(  362,  522)DRY(  363,  489)DRY(  363,  523)DRY(  363,  524)DRY(  363,  525)

   DRY(  364,  526)DRY(  364,  527)DRY(  365,  528)DRY(  366,  529)DRY(  367,  528)

   DRY(  367,  529)DRY(  368,  527)DRY(  368,  528)DRY(  369,  526)DRY(  369,  527)

   DRY(  370,  524)DRY(  370,  525)DRY(  371,  522)DRY(  372,  520)DRY(  373,  518)

   DRY(  374,  517)DRY(  377,  515)DRY(  379,  465)DRY(  380,  513)DRY(  383,  511)

   DRY(  384,  466)DRY(  385,  466)DRY(  386,  508)DRY(  386,  510)DRY(  391,  507)

   DRY(  392,  507)DRY(  393,  467)DRY(  393,  507)DRY(  394,  506)DRY(  397,  501)

   DRY(  398,  468)DRY(  399,  498)DRY(  400,  496)DRY(  401,  469)DRY(  401,  494)

   DRY(  402,  490)DRY(  404,  470)DRY(  406,  487)DRY(  407,  471)DRY(  411,  478)

  A ZERO PIVOT WAS ENCOUNTERED AT LOCATION:

  COLUMN= 303, ROW= 348, LAYER=   1

  THE DOMAIN INTEGRITY APPEARS TO BE COMPROMIZED

  AT LEAST  1 SUBDOMAIN(S) ARE PRESENT

  PARTITION  1 IS CONTAINED IN FOLLOWING REGION:

  FROM COLUMN  302 TO COLUMN  303

     FROM ROW  348    TO ROW  348

   FROM LAYER    1  TO LAYER    1

  PRECONDITIONED CONJUGATE GRADIENT SOLVER CANNOT PROCEED.

  ERROR ENCOUNTERED IN SUBROUTINE PCG, MODULE PCG_MAIN.

Any clue what might be going wrong?

regards

hpc

[Richard Winston]

Maybe the dry cells made one or more cells disconnected from the rest of the model.

--
You received this message because you are subscribed to the Google Groups "MODFLOW Users Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to modflow+u...@googlegroups.com.
To post to this group, send email to mod...@googlegroups.com.
Visit this group at http://groups.google.com/group/modflow.
For more options, visit https://groups.google.com/d/optout.

[ashutosh singh]

Can changing the solver solve it?

I had implemented rewetting in the model just in case of dry cells!

hpc

[Richard Winston]

The first thing I would try would be to use MODFLOW-NWT.