Troubleshooting Ion Exchange Membrane Desalination with Comsol - Low Voltage Fix

AI Thread Summary
The discussion revolves around a user attempting to desalinate seawater using an ion exchange membrane and encountering issues with a simulation in Comsol. The user reports that the simulation runs successfully with low initial voltages (0.5, 1, 1.5 volts) but fails with higher voltages (5, 7, 9 volts), resulting in an error. Suggestions for troubleshooting include changing initial values and checking the equations used in the simulation. The user has confirmed that lower voltages allow for convergence, but higher voltages lead to errors, leaving them confused about the underlying issue. The need for more detailed information to diagnose the problem is emphasized, as the current data is insufficient for troubleshooting.
Arash.t
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hello to every on
i m trying to desalinate seawater with an ion exchange membrane.
the initial voltage of my simulation is 5 volt and it increase to 7 and 9Volt
when i insert that data to Comsol it doesn't work and give the below error!
http://www.iran-eng.com/attachment.php?attachmentid=223509&d=1412972316
but when i insert the low voltage,for e.g 0.5 , 1, 1.5 Volt ,it run!
help me to fixed it

the pic of error:
http://www.iran-eng.com/attachment.php?attachmentid=223509&d=1412972316
 
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Please attach the file here or upload it somewhere else, using attachments from other forums do not work so we cannot see the picture (even if you might be able to see it).
 
the error :
 

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You can try to change the initial values. Or check the equations you want to solve. Without (much) more details, it is impossible to tell what went wrong.
 
mfb said:
You can try to change the initial values. Or check the equations you want to solve. Without (much) more details, it is impossible to tell what went wrong.
i checked it
in the" study => stationary => parameter value list" if i inter the(0.5,0.5,1.5) the solutioncan converged.
but when i inter (5,7,9) this error happened!.
I really confused!
 

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