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Chimera Simulations of Multibladed Rotors in High-Speed Forward Flight with Weak Fluid-Structure-Coupling

Pahlke, K. and van der Wall, Berend G. (2003) Chimera Simulations of Multibladed Rotors in High-Speed Forward Flight with Weak Fluid-Structure-Coupling. In: 29th European Rotorcraft Forum (CD), 63.1-63.13. 29th European Rotorcraft Forum, Friedrichshafen (de), 16.-18.09.2003. ISBN CD.

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The state of the art of weak fluid-structure coupling for rotors in forward flight at DLR is presented. The coupling procedure is based on the DLR rotor simulation code S4 and the DLR Navier-Stokes solver for structured grids FLOWer. The method allows to produce trimmed CFD solutions for rotors in high-speed forward flight with inclusion of elastic blade deformations and viscous effects. The weak coupling procedure is applied to high-speed forward flight test cases of the 7A and the 7AD rotor. The full 4-bladed rotor is simulated for both cases using the chimera approach. A variation of turbulence models from algebraic to 2 equation models did not show significant differences for these high-speed forward flight test cases with moderate rotor loading. The weak coupling which includes the transfer of normal forces (cn), tangential forces (ct) and pitching moments (cm) from the CFD code to the rotor simulation code improved the overall agreement with the existing experimental data compared to the uncoupled computations considerably. The performance difference between the 7A and the 7AD rotor in high-speed forward flight is well predicted.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Chimera Simulations of Multibladed Rotors in High-Speed Forward Flight with Weak Fluid-Structure-Coupling
AuthorsInstitution or Email of Authors
van der Wall, Berend G.Institut für Flugsystemtechnik
Journal or Publication Title:29th European Rotorcraft Forum (CD)
Page Range:63.1-63.13
Keywords:RANS, rotors in forward flight, unsteady flows, isolated rotors, fluid-structure coupling
Event Title:29th European Rotorcraft Forum, Friedrichshafen (de), 16.-18.09.2003
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Institute of Flight Systems
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:29

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