Hello Everyone,
I am a new user using the CFDEM. I am trying to use the heat transfer functions and have started with one of the tutorials (packedBedTemp). I can see that there are two main folders, DEM and CFD. In the DEM, there are also two input files: 1. in.liggghts_init and 2. in.liggghts_run. Besides, there are a few folders in the CFD folder, which I believe are the fluid properties. So, I have the following questions:
1. What is the difference between the files in the DEM folder? (the above 1 and 2 numbers).
2. I can see several thermalCapacity in both in _init and _run files. Which one of them is for fluid and which is for the solid? I am confused about these parameters. The same question for initial_temperature as well.
3. How can I define the T of fluid?
4. Where can I assign the velocity and density of fluid?
Thank you very much for your help. I know these questions should not be asked, but I searched a lot and could not find any answers.
alice | Tue, 04/03/2018 - 09:37
Hello,
Hello,
basically, all fluid settings that concern the fluid are made in the CFD folder (e.g., mesh, mentioned parameters - these are set in the contant/couplingProperties/LaEuScalarTempProps, boundary & initial conditions (in the 0 folder, there are files for each field like the temperature (T), the velocity (U) and the density (rho))).
In the DEM folder you find one input file which is for a liggghts-only calculation (the in.liggghts_init) file, which is used for the pure liggghts initialization calculation. You will not find a fix couple/cfd or similar command there. The in.liggghts_run file is for the coupled run, there you find the coupling commends (also the fix couple/cfd/convection command for example). The thermalConductivity and thermalCapacity you find there are the ones for the particles (in both files).
Cheers,
Alice