Development of an Analytical Wall Function for Bypass Transition

• Main Authors: Ekachai Juntasaro, Kiattisak Ngiamsoongnirn, Phongsakorn Thawornsathit, Kazuhiko Suga
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Fluids
• Subjects: wall function; analytical wall function; transition; bypass transition; transition modeling; algebraic transition model
• Online Access: https://www.mdpi.com/2311-5521/6/9/328

The objective of the present work is to propose an extended analytical wall function that is capable of predicting the bypass transition from laminar to turbulent flow. The algebraic <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula> transition model, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>k</mi><mo>−</mo><mi>ω</mi></mrow></semantics></math></inline-formula> turbulence model and the analytical wall function are integrated together in this work to detect the transition onset and start the transition process. The present analytical wall function is validated with the experimental data, the Blasius solution and the law of the wall. With this analytical wall function, the transition onset in the skin friction coefficient is detected and the growth rate of transition is properly generated. The predicted mean velocity profiles are found to be in good agreement with the Blasius solution in the laminar flow, the experimental data in the transition zone and the law of the wall in the fully turbulent flow.