A numerical method for fluid-structure interactions of slender rods in turbulent flow
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Beschreibung
This thesis presents a numerical method for the simulation of
fluid-structure interaction (FSI) problems on high-performance
computers. The proposed method is specifically tailored to
interactions between Newtonian fluids and a large number of
slender viscoelastic structures, the latter being modeled as
Cosserat rods. From a numerical point of view, such kind of
FSI requires special techniques to reach numerical stability.
When using a partitioned fluid-structure coupling approach
this is usually achieved by an iterative procedure, which
drastically increases the computational effort. In the present
work, an alternative coupling approach is developed based
on an immersed boundary method (IBM). It is unconditionally
stable and exempt from any global iteration between the fluid
part and the structure part.
The proposed FSI solver is employed to simulate the flow
over a dense layer of vegetation elements, usually designated
as canopy flow. The abstracted canopy model used in the
simulation consists of 800 strip-shaped blades, which is the
largest canopy-resolving simulation of this type done so far.
To gain a deeper understanding of the physics of aquatic
canopy flows the simulation data obtained are analyzed, e.g.,
concerning the existence and shape of coherent structures.
Autor*in
Silvio Tschisgale
Themen in »A numerical method for fluid-structure interactions of slender rods in turbulent flow«
Fluss High-Performance Computer Strömungsmechanik