Abel-John Buchner
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View article: Dynamic stall of a hydrofoil with tubercles in surface gravity waves
Dynamic stall of a hydrofoil with tubercles in surface gravity waves Open
The interaction of an object with an unsteady flow is non-trivial and is still far from being fully understood. When an airfoil or hydrofoil, for example, undergoes time-dependent motion, nonlinear flow phenomena such as dynamic stall can …
View article: Dynamic stall in vertical axis wind turbines: scaling and topological considerations
Dynamic stall in vertical axis wind turbines: scaling and topological considerations Open
Vertical axis wind turbine blades are subject to rapid, cyclical variations in angle of attack and relative airspeed which can induce dynamic stall. This phenomenon poses an obstacle to the greater implementation of vertical axis wind turb…
View article: Dynamic stall: stability and evolution at transitional Reynolds numbers
Dynamic stall: stability and evolution at transitional Reynolds numbers Open
Detailed herein is a campaign of experiments aimed at building an understanding of unsteady flow phenomena arising due to the rapid pitching motion of an airfoil. The physical problem investigated is simplified significantly from the exten…
View article: Local topology via the invariants of the velocity gradient tensor within vortex clusters and intense Reynolds stress structures in turbulent channel flow
Local topology via the invariants of the velocity gradient tensor within vortex clusters and intense Reynolds stress structures in turbulent channel flow Open
Previous works have shown that momentum transfer in the wall-normal direction within turbulent wall-bounded flows occurs primarily within coherent structures defined by regions of intense Reynolds stress [1].Such structures may be classifi…