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[Jan Stránský <question199704@xxxxxxxxxxxxxxxxxxxxx>]

Question #199704 on Yade changed:
https://answers.launchpad.net/yade/+question/199704

Jan Stránský proposed the following answer:
I am doing some tests now, and the first result is that with minus

if (isPeriodic) branch -= scene->cell->hSize*I->cellDist.cast<Real>();

the results are not ok, while with


if (isPeriodic) branch += scene->cell->hSize*I->cellDist.cast<Real>();

the results are ok.. In the tests, I am using convention that positive 
normal stress is tensile.. I will look on I->cellDist (I have never used 
it) and let you know if I discover something :-)


My idea when thinking of not using reverseSign flag was that if you use 
positive forces for tension, you would obtain positive stress for 
tension and vice versa, but maybe this assumption is not correct..

Jan

On 24.6.2012 13:25, Chiara Modenese wrote:
> Question #199704 on Yade changed:
> https://answers.launchpad.net/yade/+question/199704
>
> Chiara Modenese proposed the following answer:
>
> On 24 Jun 2012, at 11:15, Chareyre wrote:
>
>> Question #199704 on Yade changed:
>> https://answers.launchpad.net/yade/+question/199704
>>
>> Chareyre proposed the following answer:
>> Sure there is not another difference elsewhere giving the same result in
>> the end (e.g. sign of force)?
> Yes, in fact there is no reversed sign inside the function getStress but instead there is in PeriIso*.cpp. The result should be the same in the end (Jan, have you done any test in these regards?). I gather it was decided not to keep reversing the sign of contact forces depending on the convention but I am not sure it is the best solution (I think it was a good reminder to not overlook that feature).
>
> Chiara
>
>
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