Numerical Study of Vortex Core in Turbulent Swirling Flow

摘要

Two-dimensional velocity field in swirling pipe flow was numerically investigated. CFD results were validated using Phased array UVP experimental result. Following results are obtained. 1) The numerical simulation is conducted by ANSYS Fluent® v.14.5 in a tube with twisted tape inserted and verified with experimental data. Qualitative comparison is needed when swirling core position is different compared to experiment results. After shifting the CFD data, tangential velocity comparison between CFD and experiment shows a good agreement. 2) Axisymmetric or asymmetric flow is dependent on the geometry of the swirling generator. 3) Symmetric model with RNG k-s as turbulence model showed better agreement compared to experimental results when vortex core position is shifted.