Dear all,
recently, I faced a problem with CFD-DEM coupling.
both in.liggghts_init and in.liggghts_run need to define "mesh/surface" . I defined wall using STL files located in folder "meshes", the commends are as follows:
fix cv all mesh/surface file meshes/wall.stl type 1 #surface_vel -4.5 0. 0.
fix bx all mesh/surface file meshes/inlet.stl type 1
fix inface all mesh/surface file meshes/outlet.stl type 1
fix wall all wall/gran model hertz tangential history mesh n_meshes 2 meshes bx cv
However, it went wrong as follows:
fix cv all mesh/surface file meshes/wall.stl type 1 #surface_vel -4.5 0. 0.
ERROR on proc 0: Cannot open mesh file meshes/wall.stl (../input_mesh_tri.cpp:105)
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI COMMUNICATOR 3 DUP FROM 0
with errorcode 1.
NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
--------------------------------------------------------------------------
I think it is also possible to define walls using "wall/gran" method, and the above problem can be solved, but I don't know how to define cone wall.
Thank you！
| Attachment | Size |
|---|---|
 log file of my case | 4.74 KB |
Daniel Queteschiner | Fri, 01/18/2019 - 09:25
CFDEM Coupling execution
A pure LIGGGHTS simulation (init) is usually executed in the DEM folder. CFDEMcoupling simulations on the other hand are controlled by the CFD side, i.e. the execution typically takes place in the CFD folder of the coupled case, not in the DEM folder. Hence the path to the mesh files must be adapted accordingly. A solution that works for executing the LIGGGHTS part of the simulation from the CFD or DEM folder may look like this:
fix cv all mesh/surface file ../DEM/meshes/wall.stl type 1 #surface_vel -4.5 0. 0.fix bx all mesh/surface file ../DEM/meshes/inlet.stl type 1fix inface all mesh/surface file ../DEM/meshes/outlet.stl type 1yirenxindudu | Mon, 01/21/2019 - 15:41
Thank you very much! It works
Thank you very much! It works!
In addition, I found that the quality of mesh (STL) file can effect the calculation speed, it should be further meshed using netgen etc after being exported from solidworks.
Best regards
lcy1294510602 | Sat, 05/11/2024 - 06:03
hello, I wander do you know the difference between run and init
Dear, I wander do you know the difference between in.liggghts_init and in.liggghts_run, how I can set up my case.
angelaevans | Thu, 10/17/2024 - 04:13
incredibox
@ Incredibox I understand your difficulty, and this problem may come from the path or access permissions of the STL file. Please check again if the file name and path are correct, or make sure that the "wall.stl" file is in the "meshes" folder. Also, using the "wall/gran" method to define walls is interesting – if you discover a way to define cone-shaped walls, please share! Hope you can fix this error soon!