Influences of Wind Blowing Conditions on Predicted Dynamic Deformations of Textile Fabrics.

The influence of wind blowing was investigated as an essential factor that should be taken into account when the motion and deformation of textile fabrics in the air are predicted by numerical simulation. A few alternative analytical models to express how the resistance of the air exerted on rectangular strips of cloth depends on the relative velocity of fluid were examined and compared with experimental observations. The obtained results suggested that the second order model, in which the air resistance depends on a linear combination of the. velocity and the square of it, gave a better approximation than the conventional model only with the first order term.