Hi, ruochun,
Thank you for your reply.
1. For the conveyor belt model, it means that when the particle
contact to the belt mesh, the particles would be added with a belt
velocity. How to realize this function?
在2023年12月20日星期三 UTC+8 20:44:42<Ruochun Zhang> 写道：
> Hi Wenxuan,
>
> 1. You can generate particles after the system initialization in DEME. An
> example is GRCPrep_Part1
> <https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_GRCPrep_Part1.cpp>,
>
> where new particles are brought into the simulation in batches after the
> simulation starts using *AddClumps *then *UpdateClumps*. However,
> defining how they are generated is the responsibility of the user. If you
> would like to generate at a mass rate, then you have to write in your
> script the code that instantiates the initial positions of the particles
> that suffice this mass rate, and add them to the simulation with an
> appropriate frequency. Of course, depending on the problem to simulate,
> sometimes it's easier to generate all particles needed first, then use some
> sort of geometry to help release them with a certain flow rate into the
> simulation region of interest.
>
> 2. I am not sure if you meant whether it can simulate a (mesh-represented)
> conveyor belt, or simulate using a specific contact force model called the
> conveyor belt model. If it's just mesh--particle contact with a moving
> mesh, then DEME can do that. If the challenge is that the mesh is
> deformable, then DEME can do that as well (see the flexible mesh demo
> <https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_FlexibleMesh.cpp>)
>
> as well, but it is more advanced and the deformation of the mesh has to be
> simulated using an external solid mechanics solver: DEME can only provide
> the granular force the belt experiences, but not calculate how it deforms.
> However, if the idea is that the soft-material nature of the belt is
> modeled by a special force model (instead of the default Hertz--Mindlin
> model) rather than the actual deformation of the belt, then it can be done
> with a custom force model (a good example with a custom force model is used
> is probably the material fracture demo
> <https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_Fracture_Box.cpp>).
>
> This is also a more advanced usage of DEME, and it is certainly not a
> one-liner call. In short, this is a scientific question. The approach and
> the viability depend on what you'd like to explore and achieve with the
> simulation.
>
> 3. I don't know if I understand the question correctly. I think you meant
> scenarios such as a rotating object that also revolves around something
> else. You can do this and there is more than one way. You can use a tracker
> to track the geometry, then set the position and quaternion of the geometry
> using this tracker step by step, so you have explicit control over it,
> regardless of how complex the motion is. You can probably use the
> electrostatic demo
> <https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_Electrostatic.cpp>
>
> as the example, and see how the *rod_tracker *object is used to *SetPos *of
> the geometry step by step. Another approach is when the motion is simple
> enough and prescribed, you can give this geometry a family tag and then use
> *SetFamilyPrescribedLinVel
> *along with *SetFamilyPrescribedAngVel *to enforce the motion. The
> *SetFamilyPrescribedAngVel *method sets the prescribed rotational motion
> of the geometry about its own local coordinate system, then the
> *SetFamilyPrescribedLinVel *method can be used to define the global
> revolution you probably need (you can write something like *sin(3.14 * t)*
> as the prescribed motion). The excavator plowing demo
> <https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_Plow.cpp>
>
> might help you understand the usage.
>
> Thank you,
> Ruochun
>
> On Tuesday, December 19, 2023 at 3:04:18 AM UTC-6 [email protected]
> wrote:
>
>> Hi, all
>>
>> I have the following functions and would like to inquire if DEME can
>> implement them?
>> 1. Does DEME have the function of dynamically generating particles? For
>> example, generating at a certain mass rate.
>> 2. Does DEME have a conveyor belt contact model?
>> 3. Can DEME set multiple rotational motions for geometry?
>>
>> Best regards,
>> Wenxuan Xu
>>
>
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