Direct numerical simulation and large EDDY simulation of turbulent flow in a curved pipe

摘要

Numerical prediction of turbulent flow in a curved circular-pipe have been carried out mostly by RANS (Reynolds-averaged Navier-Stokes equation model) such as k - epsilon model for a practical purpose, but there is only a few predictions by DNS and LES. Predicted curved-pipe flows, however, are still defective regardless of analyzing method. To clarify the subject of such predictions, flow in a curved pipe with a somewhat strong curvature is studied here by DNS using CIT (Cubic Intepolated Pseudo-particle) solution method for general coordinate systems. Since LES with Samgorinsky's model is recently, successfully applied for solving turbulent flow, the LES with the CIP method was implemented and applied to calculate the flow for Re=20000 in this study. The results obtained by DNS and LES were compared with an existing experimental data.