Learning Forum

[fpsundari]

Hi

i'm confused bout the result of my CFD analysis. I simulated a hovering propeller without wind with same setup (steady-state) but in some RPM the drag was negative. Is it normal or indicate something wrong on my setup? Could some one explain it? I was search on many papers and website but didn't get the answer. The setup was steady state, k-omega SST 5%, boundaries: pressure inlet-pressure outlet : 1atm, MRF, and the mesh have a min orthogonal quality: 0.2 with 1.89mil cells. For this analysis, i had follow the instructictions on Ansys's youtube channel.

Thankyou in advance.

[Rob]

Negative drag force or drag coefficient? For the latter, did you alter the area reference value? The definitions are covered in the Users Guide.