  We report frictional drag reduction and a complete flow re-laminarization of
elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow
past an obstacle. We show that intensity of observed elastic waves and
wall-normal vorticity correlate well with the measured drag above the ET onset.
Moreover, we find that the elastic wave frequency grows with Weissenberg
number, and at sufficiently high frequency it causes decay of the elastic
waves, resulting in ET attenuation and drag reduction. Thus, this allows us to
substantiate a physical mechanism, involving interaction of elastic waves with
wall-normal vorticity fluctuations, leading to the drag reduction and
re-laminarization phenomena at low Reynolds number.
