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Study of sediment transport processes using Reynolds Averaged Navier-Stokes and Large Eddy Simulation

Wednesday, 24 August, 2011 - 16:00
Campus: Brussels Humanities, Sciences & Engineering campus
Patryk Widera
phd defence

The main objective of research described in this thesis is a study of the sediment transport in
fluids using Large Eddy Simulation (LES) and Reynolds Averaged Navier]Stokes (RANS) methodologies,
with the emphasis on the development of the LES methodology. Thesis consists of the code description,
its development and investigation of the sediment transport processes in fluids.

The specific objectives of this study were outlined as follows:

. Applicability of LES methodology to the sediment transport processes
. Example of improvement of the RANS models based on the LES results
. Investigation on the turbulent Schmidt number profile in case of channel with a smooth and
rough bottom
. Investigation on the fluid]sediment coupling
. Investigation on the slip velocity models for the sediment

Results obtained from simulations were as expected. It has been proved by comparing with theoretical
model that the LES methodology is useful and gives very accurate results of sediment concentration. The
LES approach gives also the possibility to investigate such a phenomenon as a turbophoresis or the
sediment uplifting in the bottom region. It was proved that the large eddy simulation technique has a
big potential in further investigations of the sediment transport as well as in the improvement of RANS
methodology in order to get more accurate results for a real life and large scale test cases.