de.pangaea.dataset997505 und dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-10-30T10:16:42Z https://doi.pangaea.de/10.1594/PANGAEA.997505 <gco:CharacterString>Dataset of direct numerical simulations of turbulent mixing in a T-shaped mixer for Reynolds number up to 2000, Schmidt number unity and laminar inlets</gco:CharacterString> 2026-10-30T10:16:41 publication Zamani Asl, Mohammad Mehdi
mehdi.zamani@zarm.uni-bremen.de
https://orcid.org/0000-0002-1322-6258 information author Avila, Marc
marc.avila@zarm.uni-bremen.de
https://orcid.org/0000-0001-5988-1090 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital Despite its widespread use as a model configuration for investigating mixing processes in chemical engineering, the turbulent regime of the T-shaped mixer remains relatively unexplored, in contrast to its well-documented transitional behaviour. To address this gap, we performed direct numerical simulations at Reynolds numbers up to Re = 2000 with a Schmidt number of Sc = 1 with spectral-element solver Nek5000. The results reveal a streamwise evolution characterised by two distinct regions before the flow approaches a fully developed duct-flow state. In the vicinity of the junction, the dynamics are dominated by a jet-like structure that displays approximate self-similarity resembling that of transitional planar jets. Downstream of this region, turbulence undergoes a decay process in which turbulent kinetic energy, dissipation, and scalar variance exhibit power-law scaling. Interestingly, the velocity-related decay exponents are characteristic of turbulence confined within bounded domains, whereas scalar variance decays at a rate consistent with unbounded turbulent flows. This difference can be explained by the spatial development of the mixing process: although turbulent fluctuations have spread across the entire channel cross-section by the end of the jet region, scalar homogenisation continues to advance laterally from the channel centre toward the walls within the decay region. In addition, the mean scalar distribution retains an error-function shape in the transverse direction, reminiscent of laminar mixing. The resulting streamwise development of the mean mixing state is described using an effective diffusion coefficient that varies along the channel. This dataset provides all the post-processed data necessary to reproduce the figures in the manuscript (doi:10.1017/jfm.2026.12098). Further, original Nek5000 binary output files (.f) can be used to extract simulation data at arbitrary spatial coordinates within the T-mixer for the averaged TKE quantities and scalar variance. Instantaneous velocity and scalar fields of the simulations are provided that allow to restart all simulations in Nek5000. completed Zamani Asl, Mohammad Mehdi
mehdi.zamani@zarm.uni-bremen.de
https://orcid.org/0000-0002-1322-6258 information principalInvestigator turbulence simulation turbulence theory turbulent mixing theme <gco:CharacterString>PANGAEA Keyword List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation Binary Object thematicClassification Numerical simulated Binary Object (File Size) physicalMeasurement Numerical simulated Bytes Bytes Figure thematicClassification Numerical simulated Title thematicClassification Numerical simulated File name thematicClassification Numerical simulated File format thematicClassification Numerical simulated Description thematicClassification Numerical simulated text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.997505?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. Related to <gco:CharacterString>Stages of turbulence generation and decay in a T-shaped mixer</gco:CharacterString> 2026-01-01 publication https://doi.org/10.1017/jfm.2026.12098 Zamani Asl, Mohammad Mehdi
mehdi.zamani@zarm.uni-bremen.de
https://orcid.org/0000-0002-1322-6258 information author Avila, Marc
marc.avila@zarm.uni-bremen.de
https://orcid.org/0000-0001-5988-1090 information author documentDigital Journal of Fluid Mechanics 1044 A17