Hi @DaleKramer,
I think I need a summary here I think as people looking at this don’t have an idea as to what the issue is and we are viewing this as incorrect results.
The solver produces a positive viscous drag, and combined with pressure drag produces a Cd approximately of 0.33, correct?
The positive drag value is also logical because the overall amount of x drag from viscous forces is expected in the positive x-direction, as the friction of the air is pulling it in the flow direction.
The fact paraview is producing negative viscous forces is not logical, and I assume incorrect for some reason.
Therefore, invalid results are produced as the target is approx 0.25 and therefore the simulation needs improving. When separation point is critical to results we must have a Y+ approaching 1 and model the results as a full resolution BL. Furthermore, as we both know, the divergence scheme needs to be of second-order to get a valid drag result, therefore both these points being improved would bring us to a result that is closer to validation.
Do you agree with all the above points?
Hope you are well,
Darren