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Towards Accurate Prediction of �Blade-Vortex-Interactions on Helicopter Rotors with Higher-Order Accurate Spatial Discretization Methods

Spiering, Frank und Wendisch, Jan-Hendrik (2016) Towards Accurate Prediction of �Blade-Vortex-Interactions on Helicopter Rotors with Higher-Order Accurate Spatial Discretization Methods. Deutscher Luft- und Raumfahrtkongress 2016, 2016-09-13 - 2016-09-15, Braunschweig, Deutschland.

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Kurzfassung

In flow simulations of helicopter configurations the blade-vortex-interactions have a significant influence on the prediction of rotor blade loads and also on the trim state. To ensure accurate results, the vortex transport within the flow field has to be physically correct without a premature decay of vortical structures due to numerical dissipation. To realize a physically correct vortex transport in flow simulations with the unstructured DLR TAU code, very fine computational grids may be required to minimize the numerical dissipation, but this leads to an extensive computational effort. A more efficient simulation method for vortical flows is the fourth-order-accurate spatial discretization method implemented in the DLR-FLOWer code, commonly entitled as the FLOWer4 flow solver variant. This method implements a PADE scheme on structured rectilinear grid, so that grid generation for complex configurations may be difficult and costly. To overcome the disadvantages of these simulations methods, the TAU and the FLOWer4 code should be coupled for accurate rotor flow simulations by using an unstructured near-body grid associated to the TAU code and a Cartesian background grid associated to the FLOWer4 code. The transfer of the flow data at the coupling boundaries is realized by an external code coupling module. Additionally the trim state of the helicopter and the blade deformation has a significant impact on the rotor blade tip vortices, which should also be considered in this work, by a further coupling of the flow solution method to the comprehensive rotor code HOST. This code is coupled loosely to the flow solver, so that the rotor blade loads of a full revolution are used to calculate a new trim state and blade deformation data for the following rotor revolution, until a converged trim state is achieved. Within the DLR project DIGITAL-X both aspects of realistic rotor flow simulations are addressed by a coupled simulation approach allowing for accurate prediction of blade-vortex-interactions on helicopters.

elib-URL des Eintrags:https://elib.dlr.de/109366/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Towards Accurate Prediction of �Blade-Vortex-Interactions on Helicopter Rotors with Higher-Order Accurate Spatial Discretization Methods
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Spiering, Frankfrank.spiering (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wendisch, Jan-HendrikJan-Hendrik.Wendisch (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Blade-Vortex-Interactions, High order methods, CFD code coupling, CFD-Structure-Flight mechanics coupling
Veranstaltungstitel:Deutscher Luft- und Raumfahrtkongress 2016
Veranstaltungsort:Braunschweig, Deutschland
Veranstaltungsart:nationale Konferenz
Veranstaltungsbeginn:13 September 2016
Veranstaltungsende:15 September 2016
Veranstalter :DGLR
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Hubschrauber
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L RR - Rotorcraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Der virtuelle Drehflügler (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Institut für Aerodynamik und Strömungstechnik > Hubschrauber
Hinterlegt von: Spiering, Frank
Hinterlegt am:13 Dez 2016 11:38
Letzte Änderung:24 Apr 2024 20:14

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