[CIG-SHORT] slower convergence in PyLith 1.4 compared with PyLith 1.3

[Tabrez Ali]

Brad

PyLith 1.3 was taking <40 iterations where as 1.4 with the following  
normalizer options takes around 1250 iterations (same solver/pc):

normalizer.length_scale = 1.0*m
normalizer.shear_modulus = 5.0e+10*Pa

All my dimensions are in meters and the shear modulus value is close  
to the value used for the fault material in v1.3

Tabrez


On Jul 23, 2009, at 2:48 PM, Brad Aagaard wrote:

> Tabrez-
>
> You need to be careful with the nondimensionalization scales. If you  
> achieved good convergence with PyLith 1.3, in PyLith 1.4 you should  
> setup the nondimensionalization scales so that the pressure scale  
> matches the shear modulus associated with the fault physical  
> properties used in PyLith 1.3.
>
> Brad
>
> Tabrez Ali wrote:
>> Brad
>> A model of mine (containing faults) that would converge fairly  
>> quickly in PyLith 1.3 shows extremely slow convergence with PyLith  
>> 1.4.
>> Are there any significant changes in the input file besides whats  
>> listed below in your mail.
>