Control of vortex shedding in a two-dimensional flow past a plate

A version of the no-feedback-control method developed by H\"ubler and L\"uscher [Helv. Phys. Acta 62, 544 (1989)] is applied to two-dimensional open-channel flow past a plate. The control is applied in the vortex-shedding regime with the aim of reducing the effective Reynolds number, thereby suppressing the vortex shedding. It is shown that the method works well not only when the flow is globally forced but also when the forcing is restricted to the boundary-layer region.