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主页 旧刊 有关人员 未来大会 American Society of Thermal and Fluids Engineering

ISSN 在线: 2379-1748

ISBN 打印: 978-1-56700-517-2 (Flash drive)

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

A NUMERICAL AND EXPERIMENTAL STUDY OF LAMINAR AND INTERMITTENTLY TURBULENT BOUNDARY LAYER ON A FLAT PLATE

Get access pages 865-877
DOI: 10.1615/TFEC2021.fnd.032183

摘要

A study was conducted to investigate the characteristics of incompressible boundary layer flows (laminar and intermittently turbulent) over a flat plate. More specifically, to study shear-stress distributions and boundary layer thickness, experimentally and numerically, for the same. The predictions based on the numerical model for laminar flow are validated using the results of the experiments in which employs Particle Image Velocimetry (PIV) techniques. The numerical study is carried out using in-house CFD codes (Explicit and Implicit based on pseudo-compressibility model) and a commercial CFD package. Reynolds Averaged Navier-Stokes (RANS) along with two equation (k-ε) turbulence model is used to simulate the intermittently turbulent flow over flat plate. Boundary layer characteristic for flow over a flat plate observed experimentally using 2D PIV technique. The experiments were conducted in a open flow channel, of constant hydraulic cross section of 50×28 cm2, made of 25 mm thick acrylic glass. The test article (plate) is made of 6 mm thick acrylic glass and is immersed into the flow of water. Velocity fields generated experimentally and predicted numerically are used to determine the shear stress distributions and boundary layer thickness for laminar region. Same are also generated inside the boundary for intermittently turbulent flows using the Explicit code and then compared to predictions of commercial CFD package and the other Implicit code. The results of this study indicate that pseudo-compressibility model used in the Implicit CFD code is capable of predicting the characteristics of external boundary layer flows successfully, and deviations between velocity magnitudes predicted by in-house codes and experimentally observed are within acceptable range.
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