creating large bed of soil with pipe

bapo22

Hello,

I am struggling to find a better way to create my large bed of soil properly with pipe. I have done lots of try-outs (bed generation tool- block and static factory) to have a proper material bed without being created in the pipe but I couldn't manage it(image1). I am now trying simply with the dynamic factories (top and directly underneath the pipe) to not have particles within the pipe(image2). It looks better but I don't think it is efficient for what I am trying to do. I am trying to analyse the stress upon pipe after a simple rockfall impact. 

The other problem is I am unfortunately using the classroom edition and it is limited to 10000 model elements. I am doing the best I can to be as realistic as I can but I couldn't find another way other than making my particles bigger. Is there anything I can do better with the setup? 

Best Regards,

Can

PrasadAvilala

Hi Can,

As you know student version has limitation on total number of particles, I suggest you to use periodic boundary.

Periodic boundary condition can be defined in the length of cylinder.

for example you can consider short pipe length which is 20 to 30 times of particle diameter and define periodic boundary condition in length direction of pipe

 

apart from this there is no other best method is possible with student version.

RWood

Hi,

This might be a bit of a faff to do, but you could add concentric cylinders inside the pipe, so that particles can't be created there, then switch them to virtual (or delete them) afterwards.

Or failing that, create a few different geometries around your cylinder, before using static/block factories. There's nothing particularly 'wrong' with using dynamic factories though.

Cheers,

Richard

bapo22

Prasad Avilala_20558 said:

Hi Can,

As you know student version has limitation on total number of particles, I suggest you to use periodic boundary.

Periodic boundary condition can be defined in the length of cylinder.

for example you can consider short pipe length which is 20 to 30 times of particle diameter and define periodic boundary condition in length direction of pipe

 

apart from this there is no other best method is possible with student version.

Hello Prasad,

Thank you for your answer! I believe I understand what you are suggesting and I am trying it out but I am still hitting the 10000 limit with my 2m long pipe(image1). I am now trying with shorter and smaller periodic boundaries(image2) but the problem is that I don't know when the soil bed is actually full with particles. I can't assume when should I drop my single rock. I can't use block factory because of particle creation in pipe so I am using dynamic factory with box dimensions 2000mm-660mm-600mm. 

My current setup:

-Soil creation for example 20s

-For the rockfall event I have a single dynamic factory 4,5m above(with limitation:1 particle)(image3). Factory start time: for example 21s

Am I in the wrong direction? 

Edit: my mistake actually. it won't consider outside the periodic boundary. the particles can't build a soil bed. simulation is erasing the particles after going through periodic boundary. back to 0%  

Thank you,

Can