Study On Drag Coefficient Of Cylinders In Tandem Arrangement

About the study of the drag coefficient of two cylinders, the early studies focused on two modes of arrangement- the tandem arrangement and the side-by-side arrangement, and they are studied at low Reynolds number in most cases. At high Reynolds number, there isn't any systematic analysis of the arrangement that the line between the two cylinders with the direction of flow had different included angle .In this thesis, Domain Decomposition Method is used to simulate the single cylinder, two cylinders in tandem arrangement and in side-by-side arrangement to find out the drag coefficient and pressure on the surface of cylinders. The calculated result is compared with the prime research in order to prove the correction of using ADINA in fluid computation .Then at high Reynolds number, the changing drag coefficient of two different arranged cylinders in fluid field is further studied, and the regularity of their changes is analyzed too. The result of simulation indicated that tandem interval and side-by-side interval play a real effect on the character of staggered double cylinders which seem to be affected by the range intervals and angles of attack of cylinders. Four cylinders arranged in tandem mode in Bridge Engineering are studied in different angles of attack and range intervals. Tandem interval and side-by-side interval between cylinders play a real effect on the character of four cylinders in tandem arrangement. When the angles of attack is 0 degrees, the drag coefficient of the two cylinders ahead and two cylinders in tandem arrangement had the same changing regularity; When the angle of attack is 45 degrees, the changing regularity of the drag coefficient of each cylinder had no difference and its value is almost the same.