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Evaluating Stability Derivatives with a Linearised Frequency Domain Solver

Widhalm, Markus und Thormann, Reik (2014) Evaluating Stability Derivatives with a Linearised Frequency Domain Solver. Scientific Computing Seminar, 2014-12-04, Kaiserslautern.

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Kurzfassung

Efficient and accurate prediction of derivatives from aerodynamic forces and moments of aircrafts are crucial for their flight stability and control. This requires numerical methods that resolve aerodynamic forces and moments for the complete range of flow conditions encountered during an aircraft flight envelope. The talk starts with an overview and discussion of the flight mechanic principle. A linear, ordinary, differential equation emerges and is the basis for many well known problems. Subsequently, the forcing function and their treatment to obtain accurate stability derivatives from aerodynamic forces will be shown in more detail which leads to the linear frequency domain solver (LFD). The LFD is a small disturbance approach. After all, a complex valued linear system of equations has to be solved. If flow conditions reach transonic and detached conditions, this linear system usually gets stiff and preconditioning methods are necessary to solve the equations. We will focus on the derivation of the LFD’s equation and numerical methods to enhance robustness. An important concern is the accuracy in the linearisation procedure. Examples of misleading results are discussed which occur due to simplifications in the linearisation. Finally, an outlook presents alternative numerical approaches for determining stability data.

elib-URL des Eintrags:https://elib.dlr.de/93360/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Evaluating Stability Derivatives with a Linearised Frequency Domain Solver
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Widhalm, MarkusMarkus.Widhalm (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Thormann, Reikreik.thormann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:4 Dezember 2014
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Computational Fluid Dynamics, Linear methods, Dynamic derivatives
Veranstaltungstitel:Scientific Computing Seminar
Veranstaltungsort:Kaiserslautern
Veranstaltungsart:Andere
Veranstaltungsdatum:4 Dezember 2014
Veranstalter :TU Kaiserslautern
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Simulation und Validierung (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Hinterlegt von: Widhalm, Markus
Hinterlegt am:05 Mai 2015 08:40
Letzte Änderung:24 Apr 2024 19:59

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