This issue is devoted to documenting the effect of upwinding parameters on the cylinder runs (also as a test of video uploads in github issues). Feel free to comment below and close the issue when discussion is complete.
Testing alpha_upw
For both the grid0 and grid1 case, the alpha_upw parameter was varied for the velocity component only, and values of 0, 0.25, 0.5, 0.667, and 1.0 were tried:
The turbulent_ke and specific_dissipation_rate were always set to 1.0.
The results show that for alpha_upw>0, the Cd results are relatively consistent, while no upwinding with alpha_upw=0 leads to an outlier result.
For the grid0 case
Flow artifacts near the cylinder were seen in the alpha_upw=0 case
which are not seen for alpha_upw=1
or for alpha_upw=0.25
The Cp distribution is also similar between alpha_upw=0.25 and 1.0: plotCp
whereas the Cp distribution for alpha_upw=0.0 is obviously different: plotCp
Testing upw_factor
A similar study was done on the upw_factor. The velocity component of upw_factor was set to 0 for alpha_upw values of 0, 0.25, 0.50, 0.667, and 1.0 for the grid0 case: