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Blast walls are implemented in order to attenuate the explosion blast wave and protect the important objects. These obstacles decrease the blast wave intensity by reflecting a portion of the wave to the explosion source and producing turbulence in the blast wave flow. The geometrical shape of the blast wall, as an influential factor, decrease the intensity and increase the protective effect of these obstacles. In this thesis, the angle of curvature of the canopy blast walls was studied to find the optimum angle with the most attenuation effect. To simulate the interaction of the blast wave with the blast wall, computational fluid dynamic with finite volume method and OpenFOAM software (an open source software) was used. The results of the simulation with LES turbulence model, was presented the more exact description for the attenuation of the blast wave interacted with the canopy blast wall. The comparison of the overpressure peak and the created vortexes behind the canopy and oblique wall, shows that the canopy wall was increased the attenuation of the blast wave up to 14%. On the other hand, by increasing the angle of curvature of the canopy wall from 0° to 67.5°, the attenuation of the interacted blast wave with the obstacle was increased step by step up to 4%.