Numerical Study on Separated Pipe Flow Using a Modified Low Reynolds Number k-¦ÅTurbulence Model

Zhang Chuhua, Gu Chuangang, Miao Yongmiao
(Xi'an Jiaotong University, Xi'an, 710049£©

£Ábstract: A modified low Reynolds number k-¦Åturbulence model applicable to separated flow recently developed in£Û£µ£Ý is used for the calculation of turbulent separated flow in pipe expansion, particularly for the numerical study on turbulent flow in the regions near the wall and neighboring to the reattachment point. It is shown theoretically that this turbulence model satisfies the near wall asymptotic behavior while avoiding ¦Ìt¡Ô£° in the whole section across the reattachment point. Comparisons with available measurements and the numerical results by previously developed k-¦Åturbulence model show that the adopted model is superior to other low Reynolds number k-¦Å models on the prediction of reattachment point and the flow field neighboring to it.
Keywords: low Re turbulence model, separation reattachment, asymptotic behavior toward the wall