Pressure and drag measurements on a cylinder in a liquid metal flow with an aligned magnetic field

Pressure distribution measurements around a cylinder placed in a liquid metal flow aligned with a constant magnetic field are presented. The pressure drag is derived from these measurements and is found to be reduced by the electromagnetic forces for values of the interaction parameter, N , around unity. For higher values of N , the rear pressure and the global pressure drag exhibit a linear dependence with the square root of the interaction parameter and it is also shown that, for a sufficient value of the magnetic field, the von Kármán street behind the cylinder is suppressed.