Magnetic arcade of a two-ribbon flare (on the left) and its model (on the right) used during simulations. The black lines illustrate the magnetic field lines. The red regions in the left panel show the flare ribbons while we implemented line-tying boundary conditions at the left and the right boundary of simulation region. The yellow dashed lines show the race of the fastest slow magnetoacoustic waves. The red star shows the position of ignition of slow wave. The yellow stars show the positions of the secondary energy releases induced by the slow magnetoacoustic pulses.