抄録
The flow around the criss-crossed two circular cylinders set normal to the uniform stream was examined from the measurements of the surface pressure distributions and the behavior of the vortex behind the cylinders. The estimation of the drag on the crossed two cylinders shows that the drag coefficient of each cylinder is lower than that of the single cylinder except in the vicinity of the crossed region. On the surface region close to the contact point the secondary flows were observed from the oil-film visualization. The vortex shedding from the four cylinder parts away from the contact point is almost equal to that of a single cylinder, but these vortices are not correlated with one another.
