clumps - particle size distribution

Hi Chiara,

I am also interested in how to do this in Yade.
I have experience how this can be done with PFC. The procedure is as follows:

1. Generate your packing with spheres.
2. Create templates of your clumps.
3. Replace spheres with clump templates (clumps should have same real volume as your spheres).

for example I send you the fish-code of my model:

;make a template of a clump with 2 overlapping spheres:
clump template make dyad 2 radii 0.5 0.5 pos (0.25, 0.5, 0.25) (-0.25, -0.25, -0.25)

;replace 5 percent of the spheres by clumps with my template called dyad:
clump replace 1 dyad 0.05

Regards,

Christian

On 19/03/12 12:11, Christian Jakob wrote:
Thank you, Christian, it makes sense to me. I will try to do it in python.
Cheers, Chiara
> Question #191084 on Yade changed:
> https://answers.launchpad.net/yade/+question/191084
>
> Christian Jakob posted a new comment:
> Hi Chiara,
>
> I am also interested in how to do this in Yade.
> I have experience how this can be done with PFC. The procedure is as follows:
>
> 1. Generate your packing with spheres.
> 2. Create templates of your clumps.
> 3. Replace spheres with clump templates (clumps should have same real volume as your spheres).
>
> for example I send you the fish-code of my model:
>
> ;make a template of a clump with 2 overlapping spheres:
> clump template make dyad 2 radii 0.5 0.5 pos (0.25, 0.5, 0.25) (-0.25, -0.25, -0.25)
>
>
> ;replace 5 percent of the spheres by clumps with my template called dyad:
> clump replace 1 dyad 0.05
>
> Regards,
>
> Christian
>

On 19/03/12 12:45, Chiara Modenese wrote:
> Question #191084 on Yade changed:
> https://answers.launchpad.net/yade/+question/191084
>
> Chiara Modenese gave more information on the question:
> On 19/03/12 12:11, Christian Jakob wrote:
> Thank you, Christian, it makes sense to me. I will try to do it in python.
> Cheers, Chiara
>> Question #191084 on Yade changed:
>> https://answers.launchpad.net/yade/+question/191084
>>
>> Christian Jakob posted a new comment:
>> Hi Chiara,
>>
>> I am also interested in how to do this in Yade.
>> I have experience how this can be done with PFC. The procedure is as follows:
>>
>> 1. Generate your packing with spheres.
>> 2. Create templates of your clumps.
>> 3. Replace spheres with clump templates (clumps should have same real volume as your spheres).
As to point 3., do you also account for the overlapping volume between
the spheres somehow? Or do you neglect it?
>> for example I send you the fish-code of my model:
>>
>> ;make a template of a clump with 2 overlapping spheres:
>> clump template make dyad 2 radii 0.5 0.5 pos (0.25, 0.5, 0.25) (-0.25, -0.25, -0.25)
>>
>>
>> ;replace 5 percent of the spheres by clumps with my template called dyad:
>> clump replace 1 dyad 0.05
>>
>> Regards,
>>
>> Christian
>>

Of course!

In the case of two overlapping spheres you have to replace ( ) with ( () ), so you have calculate the volume of a sphere cap and subtract this from the sum of the volumes of this two overlapping spheres.
formula see here:

http://en.wikipedia.org/wiki/Spherical_cap

In PFC it is done automatically with this replace command, very comfortable...

Please let us know, when you are successfull.

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