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A 3D-CFD simulation of the impeller and volute of acentrifugal pump has been performed using CFX codes. The pump hasa specific speed of 32 (metric units) and an outside impellerdiameter of 400 mm. First, a 3D flow simulation for theimpeller with a structured grid is presented. A sensitivityanalysis regarding grid quality and turbulence models were alsoperformed. The final impeller model obtained was used for a 3Dquasi-unsteady flow simulation of the impeller-volute stage. Aprocedure for designing the volute, the nonstructured gridgeneration in the volute, and the interface flow passage betweenthe impeller and volute are discussed. This flow simulation wascarried out for several impeller blades and volute tongue relativepositions. As a result, velocity and pressure field werecalculated for different flow rates, allowing to obtain the radialthrust on the pump shaft

Numerical Modelization of the Flow in Centrifugal Pump: Volute Influence in Velocity and Pressure Fields