[CIG-SHORT] Intermediate Results

[Brad Aagaard]

On 3/11/13 11:48 AM, BOK10 at pitt.edu wrote:
> So I looked at each simulation carefully and found that the earthquakes do
> occur in the same time-stamp in both cases. That being said, the amount of
> slip is NOT the same in both. Before an earthquake occurs, the behavior is
> identical (though the range of stresses in the block differ).

You are heading in the right direction. Look at the fault tractions and 
see if they are the same right before the earthquake. Look at the fault 
tractions right after the earthquake too. They should be as close as the 
tractions before if the nonlinear solve proceeded correctly. The key is 
to isolate the differences and associate them with some aspect of the 
problem setup or solver tolerances.

Brad

>
> Bobby
>
>> I understand that you have a certain quantity you are comparing between
>> simulations, but focusing on just that number is not helping you
>> identify the causes of the differences. You need to dig deeper in the
>> simulation output. Look at the time history of the deformation
>> (displacements and slip). Find what is different. Isolate the time when
>> do the differences appear. Try to determine if the differences are
>> localized in space.
>>
>> Additionally, examine if the behavior is identical before any earthquake
>> occurs. Determine if the first earthquake occurs at the same time and
>> with the same amount of slip in all of the simulations. If not, isolate
>> the differences in the stress on the fault.
>>
>> Brad
>>
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>
>
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