Documentation for fix couple/cfd/convection ; couple/cfd/speciesconvection ; and others

Submitted by yesaswi92 on Wed, 06/15/2016 - 18:05

Hi,

I am new to LIGGGHTS and CFDEM and I'm solely relying on the tutorials and documentation to learn. In one of the tutorial cases of CFDEM, I found these lines in the DEM section:
#----------------------------------------------------------------------------------------------------------
# cfd coupling
fix cfd all couple/cfd couple_every 100 mpi
fix cfd2 all couple/cfd/force
# heat transfer
fix cfd3 all couple/cfd/convection T0 600
# set particle temperature for the bed
set region total property/atom Temp 600.
#----------------------------------------------------------------------------------------------------------
Though the comments in the file are self-implicating, I'd like to know more info about them. There was also another forum entry about the same (http://www.cfdem.com/forums/about-couplecfd-and-couplecfdforce). But that was not clear.

So can anyone help me in understanding this fix.

Thank You.
Yesaswi

Forums:

yesaswi92 | Wed, 06/15/2016 - 18:08

I was actually trying to change the particle temperature in the simulation to 300K instead of 600K. But when I change the values in these fixes, there was no change at all and the simulation still gives me a temp of 600K. That is why, I would like to know more about these fixes and learn where I am going wrong.

Apologies for the long post!!
:)

paul | Wed, 06/22/2016 - 08:30

check out CFD/constant/liggghtsCommands.

As for the documentation, reading through the code seems to be the only way to gain insight into how these fixes work.