There’s no project link for us to have a look, but in case someone else stumbles upon this, here are some common reasons why this could happen:
- Wrong boundary conditions (wrong units, wrong velocity inlet direction, etc.)
- If lift and drag coefficients are way off, there could be something wrong with your definition of reference area and/or reference velocity (see here for more details)
- Poorly converged results (see here for more details)
Cheers