Turbulent Couette flow up to Re pi = 2000
[EN] Two simulations of turbulent Couette flows were performed at friction Reynolds numbers of 1000 and 2000 in a large box of dimensions L-x = 16 pi h, L-y = 2h and L-z = 6 pi h, where h is the semi-height of the channel. The study focuses on the differences in the intensity and scaling of turbulen...
| Autores: | ; |
|---|---|
| Tipo de documento: | Artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/207496 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/207496 |
| Nivel de acceso: | Acceso abierto |
| Palabra clave: | Turbulence theory Turbulent boundary layers INGENIERIA AEROESPACIAL |
| _version_ | 1878735462275743744 |
|---|---|
| author | Hoyas, Sergio|||0000-0002-8458-7288 |
| author2 | Oberlack, Martin |
| author2_role | author |
| author_browse | Hoyas, Sergio|||0000-0002-8458-7288 Oberlack, Martin |
| author_facet | Hoyas, Sergio|||0000-0002-8458-7288 Oberlack, Martin |
| author_role | author |
| collection | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| description | [EN] Two simulations of turbulent Couette flows were performed at friction Reynolds numbers of 1000 and 2000 in a large box of dimensions L-x = 16 pi h, L-y = 2h and L-z = 6 pi h, where h is the semi-height of the channel. The study focuses on the differences in the intensity and scaling of turbulence at these two Reynolds numbers. The 2000 case showed a lack of a clear log layer with a higher value of the Von Karman constant kappa than Poiseuille channels. The intensities were well-scaled in the buffer layer and below, with a second maximum of the streamwise intensity at approximately 350 wall units. Contrary to Poiseuille channels, the dissipation scales close to the wall in wall units. This fact can be attributed to the constant value of the derivative of the streamwise intensity in wall units. The intensities of the 2000 case showed remarkable differences compared with those at Reynolds number 1000 at the channel centre, likely due to the organization of large scales of the streamwise fluctuactions, u. These large scales were thought to be considered 'infinite'. However, for the 2000 case, while all the structures have a width of L-z approximate to 6/8 pi h, their length varies from L-x approximate to 6 pi h to L-x approximate to 16 pi h, which clearly contradicts the trends obtained in the past. This is a new effect that has not been reported for turbulent Couette flow and points to the uncertainty and sensitivity that is observed for certain statistical quantities. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_7d303bd9de258fb6db241fe08bc7ce5d |
| institution | Universitat Politècnica de València (UPV) |
| instname_str | Universitat Politècnica de València (UPV) |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:riunet.upv.es:10251/207496 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| reponame_str | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| spelling | Turbulent Couette flow up to Re pi = 2000 Hoyas, Sergio|||0000-0002-8458-7288 Oberlack, Martin Turbulence theory Turbulent boundary layers INGENIERIA AEROESPACIAL [EN] Two simulations of turbulent Couette flows were performed at friction Reynolds numbers of 1000 and 2000 in a large box of dimensions L-x = 16 pi h, L-y = 2h and L-z = 6 pi h, where h is the semi-height of the channel. The study focuses on the differences in the intensity and scaling of turbulence at these two Reynolds numbers. The 2000 case showed a lack of a clear log layer with a higher value of the Von Karman constant kappa than Poiseuille channels. The intensities were well-scaled in the buffer layer and below, with a second maximum of the streamwise intensity at approximately 350 wall units. Contrary to Poiseuille channels, the dissipation scales close to the wall in wall units. This fact can be attributed to the constant value of the derivative of the streamwise intensity in wall units. The intensities of the 2000 case showed remarkable differences compared with those at Reynolds number 1000 at the channel centre, likely due to the organization of large scales of the streamwise fluctuactions, u. These large scales were thought to be considered 'infinite'. However, for the 2000 case, while all the structures have a width of L-z approximate to 6/8 pi h, their length varies from L-x approximate to 6 pi h to L-x approximate to 16 pi h, which clearly contradicts the trends obtained in the past. This is a new effect that has not been reported for turbulent Couette flow and points to the uncertainty and sensitivity that is observed for certain statistical quantities. The authors gratefully acknowledge the provision of computing time on the Gauss Centre for Supercomputing e.V. on the GCS Supercomputer SuperMUC-NG at Leibniz Supercomputing Centre under project number pr92la. M.O. acknowledges partial funding by the German Research Foundation (DFG) under the project OB 96/48-1. S.H. is partially funded by project PID2021-128676OB-I00 by Ministerio de Ciencia, innovacion y Universidades/FEDER. Cambridge University Press https://riunet.upv.es/handle/10251/207496 |
| spellingShingle | Turbulent Couette flow up to Re pi = 2000 Hoyas, Sergio|||0000-0002-8458-7288 Turbulence theory Turbulent boundary layers INGENIERIA AEROESPACIAL |
| title | Turbulent Couette flow up to Re pi = 2000 |
| title_full | Turbulent Couette flow up to Re pi = 2000 |
| title_fullStr | Turbulent Couette flow up to Re pi = 2000 |
| title_full_unstemmed | Turbulent Couette flow up to Re pi = 2000 |
| title_short | Turbulent Couette flow up to Re pi = 2000 |
| title_sort | Turbulent Couette flow up to Re pi = 2000 |
| topic | Turbulence theory Turbulent boundary layers INGENIERIA AEROESPACIAL |
| topic_facet | Turbulence theory Turbulent boundary layers INGENIERIA AEROESPACIAL |
| url | https://riunet.upv.es/handle/10251/207496 |