Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

The role of forcing and eddy viscosity variation on the log-layer mismatch observed in wall-modeled large-eddy simulations

Deleon, R and Senocak, I (2019) The role of forcing and eddy viscosity variation on the log-layer mismatch observed in wall-modeled large-eddy simulations. Journal of Fluids Engineering, Transactions of the ASME, 141 (5). ISSN 0098-2202

[img]
Preview
PDF
Available under License : See the attached license file.

Download (1MB) | Preview
[img] Plain Text (licence)
Available under License : See the attached license file.

Download (1kB)

Abstract

© 2019 by ASME. We investigate the role of eddy viscosity variation and the effect of zonal enforcement of the mass flow rate on the log-layer mismatch problem observed in turbulent channel flows. An analysis of the mean momentum balance shows that it lacks a degree-of-freedom (DOF) when eddy viscosity is large, and the mean velocity conforms to an incorrect profile. Zonal enforcement of the target flow rate introduces an additional degree-of-freedom to the mean momentum balance, similar to an external stochastic forcing term, leading to a significant reduction in the log-layer mismatch. We simulate turbulent channel flows at friction Reynolds numbers of 2000 and 5200 on coarse meshes that do not resolve the viscous sublayer. The second-order turbulence statistics agree well with the direct numerical simulation benchmark data when results are normalized by the velocity scale extracted from the filtered velocity field. Zonal enforcement of the flow rate also led to significant improvements in skin friction coefficients.


Share

Citation/Export:
Social Networking:
Share |

Details

Item Type: Article
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Deleon, R
Senocak, I
Date: 1 May 2019
Date Type: Publication
Journal or Publication Title: Journal of Fluids Engineering, Transactions of the ASME
Volume: 141
Number: 5
DOI or Unique Handle: 10.1115/1.4041562
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: No
ISSN: 0098-2202
Date Deposited: 07 May 2018 19:37
Last Modified: 08 Dec 2018 05:55
URI: http://d-scholarship.pitt.edu/id/eprint/34486

Metrics

Monthly Views for the past 3 years

Plum Analytics

Altmetric.com


Actions (login required)

View Item View Item