CFDEM®coupling - User Forum

I am experiencing sudden, uncontrolled particle ejections (particles "flying away") in a CFD-DEM coupled simulation of a rotating drum with internals (segment) for heat transfer investigation (conductive and convective; low temparature area). The simulation runs stable for approximately 20-30 seconds, then particles are suddenly ejected from the packed bed. This behavior appears to correlate with the output/dump intervals.

Hello,

I am trying to simulate the aggregation of nanoparticles of size range 50-80 nm, the only problem I am encountering is my simulation is very slow. For example it's gonna at least take 8 months to finish my simulation with my current speed. I just wanted to know if there is a way to speed up the simulation as I am fairly new to CFDEM.

Thanks
Sarwar

I have trying to compile CFDEMCoupling solvers. However, it throws the following error:

Can anybody help me to do simulation of collapse of granular column submersed in in a liquid pool? Is it possible in CFDEMcoupling-public?
I have trying running a dam break problem of CFDEMcoupling in am getting an error. If anyone can help me to resolve the issue then i will be grateful.

Processor 0: field transfer
Processor 1: field transfer
Processor 2: field transfer
Processor 3: field transfer

End

// run_parallel_cfdemSolverMultiphase_test //

/home/user/CFDEM/Run/damBreak/CFD

Hello Everyone,

I am trying to reproduce the fluidized bed results from the paper "Hydrodynamic modelling of dense gas-fluidised beds: comparison and validation of 3D discrete particle and continuum models." However, I am facing some discrepancies when using cfdemSolverPiso in CFDEM.

Problem Description
- At 1.25×Umf and 1.5×Umf, the bed remains mostly fixed, whereas in the experiments, particles are already fluidized.
- At 2×Umf, particles start moving, but the average bed height is nearly half of what is reported in the publication.

Could someone please help with debugging of the code for the particle exploding behaviour:
https://youtu.be/qdRJLA0vZG8

The case is derived from periodic channel example. Interestingly the behaviour is not flow dependent as the result is the same for different inlet velocities (even U=0). I have seen there was a particle-mesh interaction Bug (somewhere in v2), but I gues this was resolved by now.

I have tried reducing the timestep, changing particle-wall interaction parameters, etc but cannot get anywhere.

I am trying to install LPP (LIGGGHTS® Post-Processing) following the official installation guide. However, I encountered issues when trying to clone the repository.
1.I attempted to clone the repository using: git clone git@github.com:CFDEMproject/LPP.git
But it returned the following error:
ERROR: Repository not found.
fatal: Could not read from remote repository.

Hi. I am trying to use LIGGGHTS and ANSYS Mechanical for studying the erosion wear of a mesh. The coupling will be one way coupling. I will transport the LIGGGHTS stress file to ANSYS. I know that you need to export mesh coordinates and the force on the mesh data from LIGGGHTS to ANSYS to do this coupling. Since, I am a beginner, I have a very less idea on how to do it. Could anybody suggest or provide a sample LIGGGHTS script explaining how these results could be exported in CSV format to ANSYS? Thank you

Where can I find the example files for "CFD-DEM with Heat Transfer"?

Greetings.
I have a couple of doubts regarding the implementation of the coarse-grained method. Please correct me if I am wrong:
1. If I am using Hooke's stiffness model, then I have to scale the stiffness and damping coefficient by the cube of CGR.
2. The inertia is already scaled, and the user doesn't need to change or modify anything while using coarse particles.