Fig. 1. The diamond joined-wing configuration UAVs at home and abroad

Fig. 2. Front-side view of the diamond joined-wing configuration UAV

Fig. 3. Grid diagram

Fig. 4. Near-wall meshes of FX63-137 airfoil

Fig. 5. Comparison of the simulative and experimental results of the lift and drag coefficients

Fig. 6. Macro-aerodynamic curves of the diamond joined-wing configuration UAV

Fig. 7. Aerodynamic forces of the front and rear wings of the diamond joined-wing configuration UAV

Fig. 8. The cross-section along the wing

Fig. 9. Distribution of the turbulent kinetic energy in each section

Fig. 10. Friction resistance of the front and rear wings with the angle of attack