A computer-implemented method for pneumatic tire simulation comprising the steps of: modeling a tire body having a cavity extending in a circumferential direction of the tire using finite elements (2a, 2b, 2c) to build a tire body model, the tire body model comprises a pair of sidewall portions and a tread portion interposed therebetween; modeling a road using finite elements (4a, 4b, 4c) to build a road model; and executing a numerical simulation in which the tire model is made to roll on the road model in a predetermined condition, characterized in that it comprises the further steps of: modeling the cavity surrounded by the tire body using finite volumes (3a, 3b, 3c) to build a cavity model; setting a pneumatic tire model coupling the tire body model with the cavity model so that a relative distance between an outer surface of the cavity model and an inner surface of the tire body model does not change; wherein finite volumes (3a, 3b, 3c) of the cavity model comprise a plurality of covering volumes each being coupled to the inner surface of the tire body model and a plurality of mid volumes being surrounded by the covering volumes, each covering volume being coupled with the inner surface of the tread portion and/or the inner surface of the sidewall portions has a greater volume than that of the mid volume being coupled inside thereof, and each covering volume being coupled with the inner surface of the tread portion has a radial length greater than that of the mid volume being coupled inside thereof. modeling a tire body having a cavity extending in a circumferential direction of the tire using finite elements (2a, 2b, 2c) to build a tire body model, the tire body model comprises a pair of sidewall portions and a tread portion interposed therebetween; modeling a road using finite elements (4a, 4b, 4c) to build a road model; and executing a numerical simulation in which the tire model is made to roll on the road model in a predetermined condition, characterized in that it comprises the further steps of: modeling the cavity surrounded by the tire body using finite volumes (3a, 3b, 3c) to build a cavity model; setting a pneumatic tire model coupling the tire body model with the cavity model so that a relative distance between an outer surface of the cavity model and an inner surface of the tire body model does not change; wherein finite volumes (3a, 3b, 3c) of the cavity model comprise a plurality of covering volumes each being coupled to the inner surface of the tire body model and a plurality of mid volumes being surrounded by the covering volumes, each covering volume being coupled with the inner surface of the tread portion and/or the inner surface of the sidewall portions has a greater volume than that of the mid volume being coupled inside thereof, and each covering volume being coupled with the inner surface of the tread portion has a radial length greater than that of the mid volume being coupled inside thereof. modeling the cavity surrounded by the tire body using finite volumes (3a, 3b, 3c) to build a cavity model; setting a pneumatic tire model coupling the tire body model with the cavity model so that a relative distance between an outer surface of the cavity model and an inner surface of the tire body model does not change; wherein finite volumes (3a, 3b, 3c) of the cavity model comprise a plurality of covering volumes each being coupled to the inner surface of the tire body model and a plurality of mid volumes being surrounded by the covering volumes, each covering volume being coupled with the inner surface of the tread portion and/or the inner surface of the sidewall portions has a greater volume than that of the mid volume being coupled inside thereof, and each covering volume being coupled with the inner surface of the tread portion has a radial length greater than that of the mid volume being coupled inside thereof.