A Lattice Boltzmann model is developed to simulate flow around a square cylinder of different roughness heights. It is evident from this study that the influences of pipe roughness on the flow parameters are quite noteworthy. It is revealed that the circumferential pipe roughness has significant influences on the hydrodynamic forces, circumferential pressure distribution, vortex shedding frequency and the formation of vortices in the vicinity of cylinder. In addition, it is seen that the orientation of the roughness elements or the density of the roughness elements does not have significant influence on the flow parameters.

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