Bug in CGP heat transfer?

MFiX
#1

Hi all,

I’m trying to reproduce Patil’s work for a further study, as in https://www.sciencedirect.com/science/article/pii/S0017931016333129, and I found different results when analysing different parcel weights, as can be seen in the attached figure,

65E2CE0D-DDB2-429B-BF51-8A8A5292A608
65E2CE0D-DDB2-429B-BF51-8A8A5292A608704×535 7.64 KB

I attach also de mfx files in case they help.

Regards,
w-27.mfx (18.0 KB)
w-8.mfx (18.2 KB)

#2

Several reasons caused the mismatch between W8 and W27. The following steps can minimize the differences in your cases:

  1. Using constant temperature BC for both the gas phase and solid phase.
  2. Provide the actual Young’s modulus, e.g. 78e9
  3. use the same “flpc” in different cases. LENS_RAD = MAX_RAD * (1.0D0 + FLPC)
  4. Other hydrodynamics related parameters, such as interpolation and revision of restitution coefficient

Summary:
The model is accurate for convection-dominated cases and the errors in conduction-dominated cases are larger. Your previous setup leads to high ratios of conduction/convection.

image
image1157×841 114 KB

1 Like
#3

Seems to work!

Thanks a lot for the answer and the guidance.

#4

Hi, could you share the revised mfix files? Thanks a lot!