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March 2008 edition

Application of an effective description procedure for interpreting 3D flow fields past a helicopter fuselage

By By Tamás Régert, CFD.HU Ltd.; Tamás Lajos, CFD.HU Ltd.; Péter Szegény, Hungaroco

This article is edited from a paper the authors presented, with detailed diagrams of results, at the International Aerospace CFD Conference in Paris organised by ANSYS, Inc. Founded in 1970, ANSYS, Inc., develops and globally markets engineering simulation software and technologies widely used by engineers and designers across a broad spectrum of industries. It also organises conferences across a range of industries including the aircraft and aerospace sectors.

This paper discusses the use of advanced flow field structure extraction methods for a comprehensive understanding of the flow field structure presented on a case of a simplified helicopter fuselage.

The turbulent flow is modeled via RANS (Reynolds-averaged Navier-Stokes) approach solved by means of Finite Volume Method on an unstructured type hybrid grid using the commercial software FLUENT 6. Two flight scenarios are presented here: cruise flight at a negative angle of attack with low influence of the induced velocity field of the rotor; and hovering flight when only the velocity field of the rotor plays a role. In cruise flight the flow field was found to be steady, thus non-linear RANS approach was reliably applied, however in the case of hovering, large scale unsteadiness was expected and the flow field was traced by means of URANS (Unsteady RANS) method. Post-processing of the results is based on the simultaneous observation of streamlines, wall-streak lines, vortex cores and the iso-surfaces of the seco....

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ANSYS, Inc. Simulation Services, Simulation Systems, Computer-aided Simulation
Budapest University of Technology & Economics Technical/Eng/Scientific Studies, Research/Consulting Services

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