CFD technique has been used to simulate the flow field for a vortex flowmeter with different inflow conditions. The transient turbulent flows were simulated and the vortex shedding frequencies were obtained by FFT technique. The relation of Strouhal number versus Reynolds number with fully developed flow inlet was acquired numerically and experimentally for the standard case. The flow qualities along the piping were quantified by a specific definition. Several cases, including the asymmetric flows and unsteady sine-wave flows at the entrance, were studied and compared with the standard one. The reasons for the fundamental frequency shift caused by different inflow conditions were addressed; several conclusions and future works based on numerical simulation were suggested.
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