This paper summarizes results obtained from a method that solves both the three dimensional thin-layer Navier-Stokes equations and Euler equations for a helicopter rotor flowfield using embedded structured and unstructured grids. The embedded structured grids use an implicit finite-difference method to solve the thin-layer Navier-Stokes equations for the regions close to the rotor blade. The structured grids lie within an unstructured grid that uses an explicit finite-volume method to solve the Euler equations and convect the vorticity downstream onto the following blades. The paper presents a description of the method, the grids systems used and a rotor in hover validation case. Although the current grid system does not adequately resolve the tip vortex core, the computed vortex paths and load predictions demonstrate the methods feasibility.
A structured/unstructured embedded grid solver for helicopter rotor flows
Ein strukturierter/unstrukturierter eingebetteter Gitter-Lösungsansatz für Strömungen an Rotorblättern von Hubschraubern
Forum, Annual Forum, American Helicopter Society, 50 ; 2 ; 1249-1258
1994
10 Seiten, 15 Bilder, 1 Tabelle, 20 Quellen
Conference paper
English
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