Computer simulations of domains propagating in lateral displacement coded circuits of the conductor‐groove type are presented. The simulations show that single wide LDC groove circuits propagate bubbles around turns with difficulty while there exists no such difficulty with a pair of smaller grooves, or dual grooves. Simulations of dual groove circuits indicate an operating margin of 600 A/m (7.5 Oe) at a propagation frequency of 500 kHz and an assumed mobility of 0.15 M2/A‐sec (1200 cm/Oe‐s). The simulated circuit results were consistent with the behavior of single domains in actual circuits.