LIGGGHTS® - Developer Forum

Hi everyone,

I have written a contact law using memory (history_offset = hsetup->add_history_value("memory", "1");), as in tangential_model_history.h. I observe memory was reset whereas contact was not lost.

Hello everybody,

as the title states, I would like to add a variable temperature to my wall, but I am a little blocked on the code,

could someone help me? maybe giving some advices on how to do it?

Thanks and best regards,
Riccardo

Hi everyone!

So far, I've used custom interaction parameters (something like a rigidity) in my contact laws, adding them in the file global_properties.cpp.

Now, I'd like to introduce a particle parameter (something like a radius).
What I've tried so far is reproduce what's implemented for the radius in the following files :
- atom.h, atom.cpp : define the new parameter
- set.cpp : set it in the input script
- atom_vec_sphere.h, atom_vec_sphere.cpp : set the atom->parameter_flag to 1, manage memory (as far as I understand)

Hi liggghts developers!

I'd like to modify the behavior implemented in the surface_model_default.h file.
So far, what I've done is to directly modify this file, which is not a clean way to do.

If I create a new surface model (surface_model_new.h) , where will I be able to choose this new model in my input scripts?

Cheers,
Robin

Hello all,

Since this is the developer forum, I assume many people here need to compile the implementation 'often'. And this could be annoying, if it takes really long time to compile.

I have observed that LIGGGHTS compilation is stuck for a long time at the following place in the os_specific.h file:

Hey,

the contact vector cdata.en is the vector from one particle to the next? But what is the direction of this vector? and is the length of the vector =1?

regards,
Joshua

In contact_models.h and some other header files. I saw this beginPass and endPass functions , but Just don't get what they do and what they mean. They are inline functions with a void return type. BUT then? what they really do? they are not constructor or destructor. Can somebody tell me?

and also there is another function named checkSurfaceIntersect(). But this function doesn't check anything, it only gives a value true. Is it really necessary?

Thank you very much~!

Xiuhan

I am interested in learning how liggghts implements DEM. What is grid size, type of meshing and so on and so forth.
Can anyone point me to some resources where I could get the necessary details?
Thanks
Siddharth

Hello, All!

I understand using LIGGGHTS we can output the STL files for the mesh surface.
Just wondering if there's any way to reproduce the STL files for all the particle surfaces?
Many thanks!

Regards,
GH

Hi people,

I've pushed another patch today to improve the scalability of particle insertion in LIGGGHTS. You can find a description here:

https://github.com/ParticulateFlow/LIGGGHTS-PUBLIC/pull/1

It's yet another one of those features I had to hold back for months. Now I'm free to publicly release it. Better late than never I guess...

Cheers,
Richard