Parameters for the collapse of turbulence in the stratified plane Couette flow
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| Title: | Main Title: Parameters for the collapse of turbulence in the stratified plane Couette flow |
| Description: | Abstract: We perform direct numerical simulation of the Couette flow as model for the stable boundary layer. The flow evolution is investigated for combinations of the (bulk) Reynolds number and the imposed surface buoyancy flux. First, we establish what the similarities and differences are between applying a fixed buoyancy difference (Dirichlet) or a fixed buoyancy flux (Neumann) as boundary conditions. Moreover, two distinct parameters were recently proposed for the the turbulent-to-laminar transition: the Reynolds number based on the Obukhov length; and the ’shear capacity’, a velocity scale ratio based on the buoyancy flux-maximum. We study how these parameters relate to each other and to the atmospheric boundary layer. The results show that in a weakly stratified equilibrium state the flow statistics are virtually the same between the different types of boundary condition. However, at stronger stratification and, more generally in non-equilibrium conditions the flow statistics do depend on the type of boundary condition imposed. In the case of Neumann boundary conditions, a clear sensitivity to the initial stratification strength is observed due to the existence of multiple equilibria, while for Dirichlet boundary conditions only one statistically steady turbulent equilibrium exists for a particular set of boundary conditions. As in previous studies, we find that when the imposed surface flux is larger than the maximum buoyancy flux, no turbulent steady-state occurs. Analytical investigation and simulation data indicate that this maximum buoyancy flux converges for increasing Reynolds numbers, which suggests a possible extrapolation to the atmospheric case. |
| Identifiers: | 10.1175/JAS-D-17-0335.1 (DOI) 0022-4928 (ISSN) http://journals.ametsoc.org/doi/pdf/10.1175/JAS-D-17-0335.1 (URL) |
Responsible Party
| Creators: | Ivo G S van Hooijdonk (Author), Herman J H Clercx (Author), Cedrick Ansorge (Author), Arnold F. Moene (Author), Bas J H van de Wiel (Author) |
| Funding References: | Netherlands Organisation for Scientific Research (NWO ALW): 832010110: -- European Research Council (ERC): 648666: Collapse Of Atmospheric Turbulence Deutsche Forschungsgemeinschaft (DFG): CRC/TRR 32: Patterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling and Data Assimilation |
| Publisher: | American Meteorological Society |
| Publication Year: | 2018 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subproject: | C7 |
| Subjects: | Keywords: 2m-Temperature, 10m-Wind Speed, Atmosphere–Land Interaction, Atmospheric Stability, Boundary Layer, Meteorology, Numerical Simulation, Planetary Boundary Layer, Surface Fluxes, Turbulence DDC: 532 Fluid mechanics; Liquid mechanics, 550 Earth sciences GEMET Inspire Spatial Data Theme: Atmospheric conditions |
| Geogr. Information Topic: | Climatology/Meteorology/Atmosphere |
File Details
| Filename: | jas.pdf |
| Data Type: | Text - Article |
| File Size: | 15 MB |
| Date: | Available: 28.06.2018 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | According to the TR32DB data policy agreement. |
| Access Limitations: | According to the TR32DB data policy agreement. |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Journal of the Atmospheric Sciences |
| Source Website: | https://journals.ametsoc.org/doi/pdf/10.1175/JAS-D-17-0335.1 |
| Issue: | 9 |
| Volume: | 75 |
| Number of Pages: | 21 (3211 - 3231) |
Metadata Details
| Metadata Creator: | Cedrick Ansorge |
| Metadata Created: | 02.08.2018 |
| Metadata Last Updated: | 02.08.2018 |
| Subproject: | C7 |
| Funding Phase: | 3 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 623 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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