Frank Denys

Frank Denys
Stellenbosch University | SUN · Department of Civil Engineering

Doctor of Philosophy

About

14
Publications
10,111
Reads
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31
Citations
Citations since 2017
6 Research Items
31 Citations
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20172018201920202021202220230246810
20172018201920202021202220230246810
20172018201920202021202220230246810
Introduction
Dam engineer specialising in design, construction and safety of dams. Currently researching Piano Key Weirs in terms of the fluid-structure-interaction between their unique hydraulic behaviour and the thin-walled structural members.

Publications

Publications (14)
Article
Full-text available
Piano key weirs (PKWs) are nonlinear hydraulic structures that exhibit unsteady hydraulic phenomena. A study incorporating both physical and numerical modeling was undertaken to identify instabilities that are generated by flow. Several excitations were identified and a portion of their nature is characterized in this paper. These include a system...
Thesis
Full-text available
This thesis considers the transient behaviour of piano key weirs (PKW) from a hydrodynamic and structural perspective. Their geometry makes them very rigid structures, however, there are thinner components of a PKW which may be prone to the onset of vibrations, specifically fluid or flow induced vibrations (FIV). Such vibrations, if strong enough a...
Conference Paper
Full-text available
Piano Key Weirs generate complex flow patterns in their vicinity. These patterns are not only variant in space but also fluctuate over time. Time variant dynamics in the inlet key originate from the presence of separation bubbles which form at the entrance edge to the inlet key. This turbulent bubble periodically sheds vortices which cause regular...
Thesis
Full-text available
The floodplain of a river forms a close relationship with the stream that created it. Not only does the river influence the characteristics of the floodplain, the floodplain can also very easily influence its river, as is evidenced by examples such as the Huang He River in China and the Columbia River in Canada. These two cases clearly indicate tha...

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