[N-R didn't converge after 999 its., maximum residual = 0.13, Xi = 0.0000]

Hi Kevin,

 

You might check the concentration of the fluid components in your initial system. Right now everything is in mass units (meq here), but I'm guessing you want these in concentration units (meq/kg, meq/l, etc.). Not sure if that's causing a problem in any way, but at the very least making sure they're in concentration units will make understanding your system a little easier.

 

Regards,

Brian

 

 

 

thanks. It's OK now.

[N-R didn't converge after 999 its., maximum residual = 0.13, Xi = 0.0000]

When I tried to run my soil water interaction simulation, I got the following error.

N-R didn't converge after 999 its., maximum residual = 0.13, Xi = 0.0000

 

the script is attached and hope you can help me.

Regards,

kevin ning

error.x1t

[How to fix this error: N-R didn't converge after 999 its., maximum residual = 1, Xi = 0.0000]

Yes. It is because of the zeros.

Thanks for the reply.

[How to fix this error: N-R didn't converge after 999 its., maximum residual = 1, Xi = 0.0000]

When I am trying to run simulations of water evaporation, reaction of groundwater and mineral phase (among others) I keep getting this error message:

 

N-R didn't converge after 999 its., maximum residual = 1, Xi = 0.0000

 

I tried to make the simulation as simple as possible, but the software still indicate errors.

 

the script is as following:

> data = "C:\Program Files\Gwb\Gtdata\thermo.dat" verify

> time start = 0 day, end = 1 yr

> length = 20 cm

> left = inlet

> right = outlet

> Nx = 20

> discharge = 5 m/yr

> porosity = .3

> scope = initial

> H2O = 1 free kg

> Na+ = 0 mg/kg

> Mg++ = 0 mg/kg

> Ca++ = 0 mg/kg

> K+ = 0 mg/kg

> balance on Cl-

> Cl- = 0 mg/kg

> SO4-- = 0 mg/kg

> HCO3- = 0 mg/kg

> pH = 7

> scope = inlet

> H2O = 1 free kg

> Na+ = 1585 mg/kg

> Mg++ = 176.5 mg/kg

> Ca++ = 50 mg/kg

> K+ = 46 mg/kg

> balance on Cl-

> Cl- = 2300 mg/kg

> SO4-- = 320 mg/kg

> HCO3- = 14.2 mg/kg

> pH = 8.2

> TDS = 45000

> react -3e3 kg/m3/yr of H2O