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[Chiara Modenese <question194761@xxxxxxxxxxxxxxxxxxxxx>]

Question #194761 on Yade changed:
https://answers.launchpad.net/yade/+question/194761

Chiara Modenese proposed the following answer:
Hi Wangxiaoliang,
The closer you get to the physics of the real material with your 
numerical model, the easier the calibration should become, up to the 
point where no calibration at all is needed (currently not possible due 
to the limit on the computational time, as Jerome said). The fact that 
you need to calibrate your model against experimental results does not 
mean that the model is wrong. With finite elements, you still need to 
calibrate the parameters of your mathematical constitutive model, for 
instance.

Suggestion:
Before deciding on the assumptions you want to make, you need to clarify 
what is the goal of your model and how you are going to do it. One 
example aong others: it is a bad idea to scale up the size of your 
particles if you are going to include attractive forces which scale with 
the particle size (the scaling would be incorrect then and the results 
difficult to interpret). Otherwise it should be safe doing it.

Chiara


On 26/04/2012 09:35, jduriez wrote:
> Question #194761 on Yade changed:
> https://answers.launchpad.net/yade/+question/194761
>
>      Status: Open =>  Answered
>
> jduriez proposed the following answer:
> Briefly : for practical reasons computer simulations can not reproduce
> the reality as it is, as you understood it. However, if you agree that
> "good calibration over the dem model with experimental models" can be
> reached, you should not see any problem in the method... (in the sense
> that the results it gives are ok, even if it is "simple")
>
> So welcome in, and enjoy, the numerical world ! :-)
>
> There might be something in common with the real one...
>

-- 
Chiara Modenese BSc MSc(Eng)
DPhil(PhD) Candidate in Engineering Science
Department of Engineering Science
University of Oxford
Parks Road, Oxford, OX1 3PJ, UK

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