This collection holds statistics from direct numerical simulations of turbulent wall-bounded flows which serve as abstraction of the atmospheric boundary layer. The simulations were carried out since 2011 on a variety of supercomputing systems (jugene, juqueen, juwels at Jülich Supercomputing centre, and hawk at Höchstleistungsrechenzentrum Stuttgart) using the tool-suite for turbulence simulation tlab - available on github.

Each item of the collection contains time-series of

- a namelist files name dns.ini holding the configuration of the tLab code (for documentation, please refer to github)
- vertical profiles of velocity and scalar variables (temperature/buoyancy as active and for some cases also passive scalars)
- the profiles of the contributions to the turbulence kinetic energy
- the profiles of the contributions to the scalar variance budget (if available)
- moments up to 4th order of velocity and temperature and their derivatives

The file dns.ini is a plain text file in the format required by the tLab tool-suite. The statistical data are available in self-documented netCDF format with one file holding data correspdoning to the velocity variables (ri{Richardson number}_re{Reynolds number}_{grid}_{timestamp}_avg_all.nc) and one file per each scalar variable holding the scalar statistics (ri{Richardson bulk number}_re{Reynolds number}_{grid}_{timestamp}_avg{scalar-ID}s_all.nc).

**Funding: **As of 2023, the initiation of this collection, work on the iterms belonging to it has been funded by an ERC Starting Grant (#851374), the DFG Transregional research collaboration #32 (TR32) from 2015-2018, a University of Cologne PostDoc Grant awared to C. Ansorge.

2024datasetTurbulent Ekman flow under stable stratification

Set-up and vertical profiles for Re=1000Ansorge, Cedrick

Set-up and vertical profiles for Re=1000Ansorge, Cedrick

This dataset contains statistics of resolved-turbulence simulation for turbulent Ekman flow,
the flow over a flat rotating plate. The five simulation cases differ by the strength of stable
density stratification imposed as a Dirichlet boundary condition at the surface, quantified
by a Froude and Richardson numbers. Here, cases are labelled by their Froude numbers as fr02, fr05, fr07, fr09, fr18. The choice of Re_Λ ... View more

This dataset contains statistics of resolved-turbulence simulation for turbulent Ekman flow, the flow over a flat rotating plate. The five simulation cases differ by the strength of stable density stratification imposed as a Dirichlet boundary condition at the surface, quantified by a Froude and Richardson numbers. Here, cases are labelled by their Froude numbers as fr02, fr05, fr07, fr09, fr18. The choice of Re_Λ = 5 × 10^5 corresponds to an Ekman-based Reynolds-number of 1000 and a friction Reynolds number Re_τ ≈ 1400 for the neutrally stratified case. The turbulent flow is simulated with tLab using a computational grid with dimensions of 3072 x 512 x 6144 and a spatial resolution at the surface of approximately 4.1 × 4.1 × 1.05 wall units. The horizontal domain size is scaled to 1.08 in terms of Rossby radius. This dataset contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files.

View less2024datasetDirect numerical simulation of turbulent Ekman flow with cubic small-scale surface roughness (Re=1000)

Neutral density stratification (Re=1000)

Direkte numerische Simulation der turbulenten Ekmanströmung mit kubischer kleinskaliger OberflächenrauigkeitKostelecky, Jonathan

Neutral density stratification (Re=1000)

Direkte numerische Simulation der turbulenten Ekmanströmung mit kubischer kleinskaliger OberflächenrauigkeitKostelecky, Jonathan

This dataset contains four simulation cases (identifier: s, r1, r2, r3), one smooth case (s) and three cases with small-scale surface roughness (r1, r2, r3). The netCDF file names in the dataset include grid information and the date of creation of the data on the High-Performance Computing (HPC) system. The Reynolds number in this simulation is Re=1000, based on the laminar Ekman layer thickness, the geostrophic wind ... View more

This dataset contains four simulation cases (identifier: s, r1, r2, r3), one smooth case (s) and three cases with small-scale surface roughness (r1, r2, r3). The netCDF file names in the dataset include grid information and the date of creation of the data on the High-Performance Computing (HPC) system. The Reynolds number in this simulation is Re=1000, based on the laminar Ekman layer thickness, the geostrophic wind and kinematic viscosity. The turbulent flow is simulated with tLab using a computational grid with dimensions of 3072 x 656 x 3072 and a spatial resolution at the surface of 2.3 × 1.0 × 2.3 in terms of smooth wall units in the streamwise, wall-normal and span-wise directions respectively. The domain size is scaled to 0.27 in terms of Rossby radius. This dataset contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files. A detailed description of the methodology and implementation is found in the git repository https://github.com/turbulencia/tlab, which contains the relevant code and a manual.

View less2024datasetDirect numerical simulation of turbulent Ekman flow (Re=1300)

Neutral stratification (Re=1300)Ansorge, Cedrick

Neutral stratification (Re=1300)Ansorge, Cedrick

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1300 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 2560 x 5120 x 640 and a spatial resolution of 8.9 × 4.5 × 0.99 in terms of wall units. The domain size is scaled to 0.54 in terms ... View more

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1300 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 2560 x 5120 x 640 and a spatial resolution of 8.9 × 4.5 × 0.99 in terms of wall units. The domain size is scaled to 0.54 in terms of Rossby radius. For detailed of the methodology and implementation, the git repository https://github.com/turbulencia/tlab contains the relevant code and a manual. This dataset also contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files.

View less2024datasetDirect numerical simulation of turbulent Ekman flow (Re=1000)

Neutral stratification (Re=1000)Ansorge, Cedrick

Neutral stratification (Re=1000)Ansorge, Cedrick

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1000 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 3072 x 6144 x 512 and a spatial resolution of 9.3 × 4.7 × 1.14 in term of wall units. The domain size is scaled to 1.08 in terms ... View more

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1000 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 3072 x 6144 x 512 and a spatial resolution of 9.3 × 4.7 × 1.14 in term of wall units. The domain size is scaled to 1.08 in terms of the Rossby radius. For detailed of the methodology and implementation, the git repository https://github.com/turbulencia/tlab contains the relevant code and a manual. This dataset also contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files.

View less2024datasetDirect numerical simulation of turbulent Ekman flow (Re=1600)

Neutral stratification (Re=1600)Ansorge, Cedrick

Neutral stratification (Re=1600)Ansorge, Cedrick

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1600 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 3860 x 7680 x 960 and a spatial resolution of 8.6 × 4.3 × 1.00 in term of wall units. The domain size is scaled to 0.54 in terms ... View more

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation with Re=1600 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 3860 x 7680 x 960 and a spatial resolution of 8.6 × 4.3 × 1.00 in term of wall units. The domain size is scaled to 0.54 in terms of Rossby radius. For detailed of the methodology and implementation, the git repository https://github.com/turbulencia/tlab contains the relevant code and manual. This dataset also contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files.

View less2024datasetDirect numerical simulation of turbulent Ekman flow (Re=500)

Neutral stratification (Re=500)Ansorge, Cedrick

Neutral stratification (Re=500)Ansorge, Cedrick

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation Re=500 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 2048 x 2048 x 192 and a spatial resolution of 4.1 × 4.1 × 1.05 in terms of wall units. The domain size is scaled to 1.08 in terms of ... View more

The netCDF file in the dataset includes grid information and the date of creation of the data on the High-Performance Computing (HPC) system. In this simulation Re=500 based on laminar Ekman layer thickness. We investigate the turbulent flow using a computational grid with dimensions of 2048 x 2048 x 192 and a spatial resolution of 4.1 × 4.1 × 1.05 in terms of wall units. The domain size is scaled to 1.08 in terms of the Rossby radius. For details of the methodology and implementation, the git repository https://github.com/turbulencia/tlab contains the relevant code and a manual. This dataset also contains a PDF file outlining the simulation setup and description of the variables contained in the netCDF files.

View less