Interaction between the particles in a clump

Hello,

> I tried his example
> the interactions between these bodies will not be removed

what is "his example"? The code in OP? If yes, then there are no "interactions between these bodies" (they are clumped before O.step)

cheers
Jan

Hello Jan, thank you for your reply!

The example code is in the OP:

******** Example **********
O.bodies.append(sphere(Vector3(0,0,0),1,fixed='True'))
O.bodies.append(sphere(Vector3(0,0,1.99),1,fixed='True'))
O.bodies.clump([0,1])
O.step()
O.interactions.has(0,1) # returns false here (true without O.bodies.clump() line)
***************************

I run this example, If there is no interactions, the result should return "False" for "O.interactions.has(0,1)". However,I run it in YADE and it return "True", which makes me so confused.

As you said, they are clumped before the O.step(), so there should be no interaction. I run the code line by line in the terminal, do you think it affect the result?

Regards,
Yuxuan

Thanks for clarification.

Normally it should work like you described:
- new interactions are not created within a clump
- existing interactions are not deleted (if a clump is made of interacting particles)

I am not sure with the second point, but looks like that from quick simple tests (e.g. switching O.bodies.clump and O.step in the example code)

Why it is not like that in your code might have several reasons:
- do you run in "clean" terminal? Can you try using a script file?
- what version of Yade do you use?

cheers
Jan

Hello Jan, thank you for your answer!

- do you run in "clean" terminal? Can you try using a script file?

Yes, now I run the code both in the "clean" terminal and through a script file. Both shows "True" for "O.interactions.has(0,1)", which means that there is interaction between the two sphere bodies. In the code, the O.bodies.clump() is run before the O.step(), so according to your clarification there should be no interaction. The contraction makes me so confused, is these results consistent in your computer?

 - what version of Yade do you use?

I use Yade 2018.02b, do you think this version works?

Kind Regards,
Yuxuan Wen

Hello Jan,

Thank you for your answer! It really helps! I think I need to update the YADE to the latest version.

Kind Regards,
Yuxuan

Thanks Jan Stránský, that solved my question.

Using yadedaily is the easiest way IMO, see https://yade-dem.org/doc/installation.html
cheers
Jan

Got it!! Thank you Jan and have a nice weekend!!
Yuxuan Wen