Доступ предоставлен для: Guest
Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

CHARACTERISTICS OF PRESSURE DISTRIBUTION AND SKIN FRICTION WITHIN THE LAMINAR SEPARATION BUBBLE AT DIFFERENT REYNOLDS NUMBERS

pages 365-370
DOI: 10.1615/TSFP9.620
Get accessGet access

Краткое описание

Mechanisms behind the pressure distribution within a laminar separation bubble (LSB) are investigated by largeeddy simulations around a 5% thickness blunt flat plate. The plate length based Reynolds numbers are set to be (Rec) 5.0×103, 6.1×103, 8.0×104, 1.1×104, and 2.0×104. From the results, two types of LSB are observed; steady laminar separation bubble (LSB S) at Rec = 5.0×103 and 6.1×103, and a steady-fluctuating laminar separation bubble (LSB SF) at Rec = 8.0×103, 1.1×104, and 2.0×104. As the Reynolds number increases, different shapes of pressure disribution appear such that a gradual pressure recovery in the LSB S and a plateau pressure distribution followed by a rapid pressure recovery in the LSB SF. The reasons of appearing the different shapes of pressure distributions depending on the Reynolds number are explained by deriving the Reynolds averaged pressure gradient equation. From the momentum budgets of the equation, it is confirmed that the viscous stress near the surface has an influence on determining the different shape of pressure distribution. The different viscous stress distributions near the surface are affected by grwoth of the separated laminar shear layer depending on the Reynolds number or generation of the Reynolds shear stress.

Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции Цены и условия подписки Begell House Контакты Language English 中文 Русский Português German French Spain