CFDEM®coupling - User Forum

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.

Dear CFDEM member.
I am newbie in using CFDEM. I am now running the tutorial for CFD-DEM with heat transfer by solver cfdemSolverPisoSTM. I just run the command line (./Allrun.sh) and then I make a file CFD.foam in CFD folder, I use the paraview to read the CFD.foam but I can not see the information for temperature of particel and heatFlux (convective fluid-particle heat transfer) like the picture which show in the link "https://www.cfdem.com/cfd-dem-heat-transfer".

Hello everyone,

I’m currently working on a simulation using the multiphaseInterFoam solver (specifically, the PFM version cfdemSolvermultiphase from the tutorials). My goal is to model fluid injection into a porous medium with particles, but I’m encountering some issues with pressure stability. The simulation often shows negative pressures and other unstable pressure fluctuations.

I’d appreciate any suggestions or troubleshooting tips on resolving these pressure issues.

Hi,
I am new to CFDEM and am trying to use it to simulate particles for a 3D printer. The paper I am trying to replicate uses Fluent for DPM concentration in kg/m3. So, far I understand,

DPM concentration= Total particle mass in a cell/Cell volume

I am trying to achieve the same using CFDEM. I cannot find a way to do that in Paraview. Specially how do I get mass per unit cell and the unit cell volume. Can you help me?

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Hi everyone i want to simulate something with this information. but I don't know how could the condition is same for gas and oil and I just can simulate gas and when use oil , the simulation isn't stable and it's look like the particle dispersed and spin in oil
if anybody have any solution please help me
best regards