부산대학교 도서관

In this work, the effect of sudden contraction in a pipe line has been investigated using finite element methods and the obtained results have been compared to literature. The results show that the length of upstream flow separation in contraction plane increases with Reynolds number of 104. But the length of upstream flow separation decreases for greater Reynolds number. The flow separation exists for all of Reynolds number. By increasing the Reynolds number, the length of upstream flow decreases. The flow separation is not exist in downstream at Reynolds number less than 300. The results show that by increasing X/D,the dimensionless velocity increases in pipe center. Further grid refinement did not cause significant changes in the predictions and therefore these results can be considered to be grid independent. [ABSTRACT FROM AUTHOR]