Hi, Alice,
I am using solverIB to simulate periodic laminar particle-fluid flows in a cylindrical pipe.
In CFD side, I set all the parameters in "0" folder to be cyclic for the inlet and outlet, and set a source in fvOptions to drive the flow. The flow velocity (parabolic) and pressure (uniform) profiles are fine.
In DEM side, the boundary is set to be p f f.
Unfortunately, when I plot the particle velocity(vx, vy, vz) changing with time, I find there is a velocity jump when the particle flows out of the outlet and then flows into the the inlet.
It seems that there is a bug. I attach the pipe and the results of vy below. Look forward to your comments and suggestions.
| Attachment | Size |
|---|---|
 pipe with axis in x direction | 5.39 KB |
| velocity jump when part of the particle is out of the domain | 5.56 KB |
| velocity changing with time | 7.45 KB |
Nucleophobe | Sun, 02/28/2016 - 22:27
Same problem
Hi fanfengxian, others:
Sorry to bring up an old thread, but was this ever resolved? I would like to perform a similar simulation by have had the same problem as fanfengxian here.
Thanks,
-Nuc
Daniel Queteschiner | Tue, 03/01/2016 - 15:55
Case setup?
Without further information about the setup (i.e. couplingProperties dict) it's difficult to tell if what we see is a bug in the CFDEMcoupling code or an issue with the setup.
E.g., the locateModel_engineSearchIB has an undocumented flag
checkPeriodicCellsfor periodic bc that is set to false by default ...Providing a small test case that demonstrates the issue may help to get the problem sorted out.
Nucleophobe | Thu, 03/03/2016 - 16:58
Thanks
Thanks for the response, Dan.
I just discovered the 'checkPeriodicCells' flag and haven't had a chance to try it.
I will try using the flag and then upload an example case sometime in the next few days.