Before revision:  The toy problem that we consider is  the Turek-Hron benchmark test case, with a fluid Reynolds number Re = 100, which is known to lead to the formation of Karman vortexes in the fluid, and a periodically oscillating behaviour in the structure.
After revision:  The toy problem that we consider is the Turek-Hron benchmark test case, with a fluid Reynolds number Re = 100.