标题：The direct numerical simulation of pipe flow
作者：Liu Zheng-gang; Du Guang-sheng; Shao Zhu-feng
作者机构：[Liu, Z.-G] School of Energy and Power Engineering, Shandong University, Jinan 250061, China;[ Du, G.-S] School of Energy and Power Engineering, Shand 更多
通讯作者地址：[Du, GS]Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Peoples R China.
关键词：Direct Numerical Simulation (DNS);pipe;turbulence intensity;Reynolds stress
摘要：The conservative difference scheme and the third-order Runge-Kutta scheme in combination with the the Crank-Nicholson scheme are used to directly simulate the flow field in a pipe with the Reynolds number of 2 600. The flow field, including the velocity distribution and the turbulence intensity, is obtained by the direct numerical simulation. From the calculated results, the ratio of the linear average velocity along the ultrasonic propagation path to the profile average velocity on the pipe cross-section is also obtained in an ultrasonic flow meter. It is concluded that the direct numerical simulation method can be used to study the ratio of the profile-linear average velocity at low Reynolds number conditions in the transition region and to improve the measurement accuracy of the ultrasonic flow meter.