Predictive near-wall modelling for turbulent boundary layers with arbitrary pressure gradients

Yang, Xiang I. A.1; Chen, Peng E. S.2; Zhang, Wen2; Kunz, Robert1

2024-09-13

10.1017/jfm.2024.565

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

The mean flow in a turbulent boundary layer (TBL) deviates from the canonical law of the wall (LoW) when influenced by a pressure gradient. Consequently, LoW-based near-wall treatments are inadequate for such flows. Chen et al. (J. Fluid Mech., vol. 970, 2023, A3) derived a Navier-Stokes-based velocity transformation that accurately describes the mean flow in TBLs with arbitrary pressure gradients. However, this transformation requires information on total shear stress, which is not always readily available, limiting its predictive power. In this work, we invert the transformation and develop a predictive near-wall model. Our model includes an additional transport equation that tracks the Lagrangian integration of the total shear stress. Particularly noteworthy is that the model introduces no new parameters and requires no calibration. We validate the developed model against experimental and computational data in the literature, and the results are favourable. Furthermore, we compare our model with equilibrium models. These equilibrium models inevitably fail when there are strong pressure gradients, but they prove to be sufficient for boundary layers subjected to weak, moderate and even moderately high pressure gradients. These results compel us to conclude that history effects in mean flow, which negatively impact the validity of equilibrium models, can largely be accounted for by the material time derivative term and the pressure gradient term, both of which require no additional modelling.

turbulence modelling turbulent boundary layers

SCI

英语

通讯

Office of Naval Research[N000142012315] ; National Natural Science Foundation["12225204","11988102"] ; NSFC[12102168]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:001310801700001

CAMBRIDGE UNIV PRESS

Web of Science

1.Penn State Univ, Mech Engn, University Pk, PA 16802 USA
2.Southern Univ Sci & Technol, Mech Engn, Shenzhen 518055, Guangdong, Peoples R China

Yang, Xiang I. A.,Chen, Peng E. S.,Zhang, Wen,et al. Predictive near-wall modelling for turbulent boundary layers with arbitrary pressure gradients[J]. JOURNAL OF FLUID MECHANICS,2024,993.

Yang, Xiang I. A.,Chen, Peng E. S.,Zhang, Wen,&Kunz, Robert.(2024).Predictive near-wall modelling for turbulent boundary layers with arbitrary pressure gradients.JOURNAL OF FLUID MECHANICS,993.

Yang, Xiang I. A.,et al."Predictive near-wall modelling for turbulent boundary layers with arbitrary pressure gradients".JOURNAL OF FLUID MECHANICS 993(2024).