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The aim of this work was to obtain the correct hydraulic proprieties of a hydraulic spool servo-valve using computational fluid-dynamics (CFD) techniques and adopting an accurate enough mesh to analyse the flow pattern inside the valve. The zones where thickening of the mesh is necessary have been detected and a method to generate the mesh, based on Reynolds numbers and spool stroke, has successfully been used to minimize computational resources. A comparison with numerical and experimentaldoi:10.1080/14399776.2013.10781075 fatcat:qab7gukqlrgrnpsalk6f2dlnru