Abgeschlossene Abschlussarbeiten
Eine Liste mit Themenvorschläge für Abschlussarbeiten zur Erlangung des Diplom- oder Mastergrades und des Bakkalaureats sowie für Projektarbeiten finden Sie auf der Seite des Instituts.
Folgende Abschlussarbeiten wurden an der Professur für Wasserbau betreut:
Hydro-numerical investigations concerning the influence of two different turbulence modeling approaches (RANS with k-e-equation and LES) within two types of fish migration facilities (Vertical Slot Fish Pass and Meander-Type Fish Pass)
Art der Abschlussarbeit
Master
Autoren
- Schneider, Lisa Kathleen
Betreuer
- Dipl.-Ing. Rocco Zimmermann
- Dr.-Ing. Ulf Helbig
- Prof. Dr.-Ing. Jürgen Stamm
Abstract
In 2000, the European Union Water Framework Directive was implemented as a reaction
to the declining status of European waters. The Water Framework Directive requires all
European member status to achieve a “good status” in waters at the latest by 2027. In
Germany, due to fragmented rivers and a lack of habitats, the deteriorated fish fauna is one
of the main reasons for the unsatisfactory status of surface waters. Therefore, establishing
river continuity is an important step towards achieving a “good status”. One measure
is to build fish migration facilities which allow up- and downstream migration past traverse
structures. The vertical slot fish pass and meander fish pass are two types of fish passes
that differ distinctly from each other with regard to turbulence, energy dissipation and flow
regime stability. The two fish passes were modeled in OpenFOAM using two turbulence
models, the Reynolds averaged Navier-Stokes model and the Large Eddy Simulation model.
Thus, it was possible to qualitatively compare the two fish passes with each other as well
as model the effect of the different turbulence models on the flow regime. The simulation
analysis showed that the meander fish pass provides a stable flow regime that is independent
of the implemented turbulence model or geometry. The vertical slot pass provides a
dissipative flow regime that varies with the implemented turbulence model and geometry.
Furthermore, the Large Eddy Simulation provided a better approximation when compared to
in-situ measurements. Lastly, using the Large Eddy Simulation, the turbulent kinetic energy
was calculated. This calculated turbulent kinetic energy could provide a different approach
towards calculating turbulence threshold ranges in fish passes in the future.
to the declining status of European waters. The Water Framework Directive requires all
European member status to achieve a “good status” in waters at the latest by 2027. In
Germany, due to fragmented rivers and a lack of habitats, the deteriorated fish fauna is one
of the main reasons for the unsatisfactory status of surface waters. Therefore, establishing
river continuity is an important step towards achieving a “good status”. One measure
is to build fish migration facilities which allow up- and downstream migration past traverse
structures. The vertical slot fish pass and meander fish pass are two types of fish passes
that differ distinctly from each other with regard to turbulence, energy dissipation and flow
regime stability. The two fish passes were modeled in OpenFOAM using two turbulence
models, the Reynolds averaged Navier-Stokes model and the Large Eddy Simulation model.
Thus, it was possible to qualitatively compare the two fish passes with each other as well
as model the effect of the different turbulence models on the flow regime. The simulation
analysis showed that the meander fish pass provides a stable flow regime that is independent
of the implemented turbulence model or geometry. The vertical slot pass provides a
dissipative flow regime that varies with the implemented turbulence model and geometry.
Furthermore, the Large Eddy Simulation provided a better approximation when compared to
in-situ measurements. Lastly, using the Large Eddy Simulation, the turbulent kinetic energy
was calculated. This calculated turbulent kinetic energy could provide a different approach
towards calculating turbulence threshold ranges in fish passes in the future.
Zugeordnete Forschungsschwerpunkte
- 1d-, 2d- und 3d-Strömungssimulation
- Fischaufstieg und Fischabstieg
Schlagwörter
meander fish pass, vertical slot fish pass, OpenFOAM, RANS, LES, turbulent kinetic energy
Berichtsjahr
2017