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-   -   SPH particle vs. real fragment size (http://www.cfd-online.com/Forums/fluent/63440-sph-particle-vs-real-fragment-size.html)

Katarina April 8, 2009 09:48

SPH particle vs. real fragment size
 
Hi,

I am modelling high velocity impacts and the ejected fragments in SPH. In my model, the fragments I am interested in are each represented with a single SPH particle.

So, I can read that particle density, volume, cell mass. But, when I multiply volume and density I don't get the cell mass. I am aware of the kernel function, so maybe due to interpolation these numbers don't match? I have no insight in the details of SPH implementations in Autodyn, so I can't know how it's doing the calculations.

Also, what does Autodyn consider to be the characteristic length of SPH particle?

The bottom line is, I am in doubt now which parameters to consider as "real" and assign them as the measured real size of the ejected fragments.

Can anyone please help in clarifying this?
Thank you.
Regards,
Katarina


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