Computational Study of a 3D Turbulent Channel With Wavy Wall

• Main Authors: Yie-Ren Zeng, 曾郁仁
• Other Authors: Yeong-Pei Tsai
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/70726409795409154016

碩士 === 中華大學 === 機械工程學系碩士班 === 97 === Most turbulent problems happening to the nature and engineering applications were exactly the turbulence problem frequently caused by one or more turbulent shear flows. Among them, wavy wall flow was affected by curve surface and this effect became one of the typical problems in researching the effect onto turbulence flow triggered by way walls. Complex wavy walls were broadly applied engineering techniques such as transportation airplanes and vessels with their surface friction rating 50% of total resistance force. For moving underwater such as submarines, the said surface friction will amount to 70% of total friction. In addition, in the long-distance channels for transportation, almost all dynamics were used to overcome the surface friction. This study was operated with incompressible 3-D channels with cyclic wavy boundary to explore the physical properties of turbulence flow. For the selection of numerical operations, the UP-WIND Scheme was directly used to solve the Navier-Stokes equation. As for temporal discretization, the LU-SSOR method was adopted to enhance numerical stability and accelerate the equation convergence. Because wavy tube walls were featured with increased drag and reduced resistance force with energy saved. This research measures the distribution of average velocity, instant flowing field shapes, turbulence and pressure distribution, etc. Furthermore, the systematic computation and analysis for the 3-D flow field was also implemented. It was aimed to clearly understand the turbulence fields formed by wavy bounds of tube flow.