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Adaptive-fidelity CFD for predicting flying qualities in preliminary aircraft design
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aerodynamics.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

To reduce development cost and to avoid late design fixes in aircraft design, methods that are fast and economic in estimating the aerodynamic characteristics of complex flight vehicles at the preliminary design stage are desired. This work and thesis focus on the adaptive-fidelity CFD approach, with emphasis on the high end of the CFD tools available today.

The core idea of the method is to use computationally cheap modeling in the part of the flight envelope where it is applicable. When the complexity in the flow field increases more details and realism is included in the mathematical model, at a computationally higher cost. A typical case where this would be required could be at the border of the flight envelope, where flow phenomena such as shocks, flow separation, and interacting vortex systems could occur.

Since the number of cases needed to resolve the flight envelope could be in the order of ten thousands automation is required. The bottlenecks are the discretization of the fluid volume and evaluation of raw CFD data and post processing of the data. These issues are also discussed in this work.

The method has been tested on two real flying aircraft, the X-31 delta-winged aircraft with vector thrust, and the Ranger 2000 Jet trainer, as well as on the SACCON preliminary wing-body UCAV design. The results provide improved understanding of the usefulness of this method as an analysis tool during the preliminary design phase all the way into the flight test diagnostic phase of a new aircraft.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , x, 23 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2011:07
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31400OAI: oai:DiVA.org:kth-31400DiVA: diva2:403511
Presentation
2011-02-25, Sal H1, KTH, Teknikringen 33, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20110314Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2011-03-14Bibliographically approved
List of papers
1. Creation of aerodynamic database for the X-31
Open this publication in new window or tab >>Creation of aerodynamic database for the X-31
2010 (English)In: 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010, 2010-0501- p.Conference paper (Refereed)
Abstract [en]

Adaptive fidelity computional fluid dynamics (CFD) uses CFD tools spanning from vortexlattice methods codes to more advanced inviscid Euler solvers and finally URANS (Unsteady Reynolds Averaged Navier Stokes) CFD solvers. At the high end the automatization process is no longer a simple straight forward task, for this purpose a script-driven tool has been developed for integration into the multi-fidelity framework CEASIOM developed in the SimSAC project. The scripting technologies to prepare, conduct, post-process and collect aerodynamic forces & moments into the aero-dataset. The tool together with the CEASIOM framework has been applied to the X-31 to create an aerodynamic dataset that is then analyzed by the stability & control tool SDSA to assess the modes of motion inherent in the dataset.

Keyword
Aerodynamic database, Aerodynamic forces, CFD solver, Control tools, Data sets, Euler solver, Modes of motion, Post process, Unsteady reynolds-averaged navier-stokes, Vortex lattice method, Aerodynamics, Aerospace engineering, Computational fluid dynamics, Aerodynamic stability
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-31397 (URN)2-s2.0-78649829466 (ScopusID)978-160086739-2 (ISBN)
Conference
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition; Orlando, FL; United States; 4 January 2010 through 7 January 2010
Note

QC 20110314

Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2014-08-29Bibliographically approved
2. Engineering methods applied to a UCAV configuration: some aerodynamic design considerations
Open this publication in new window or tab >>Engineering methods applied to a UCAV configuration: some aerodynamic design considerations
Show others...
(English)In: Journal of Aircraft, ISSN 0021-8669Article in journal (Other academic) Submitted
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-31398 (URN)
Note
QS 20120327Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2012-03-27Bibliographically approved
3. From geometry to CFD-based aerodynamic derivatives - an automated approach
Open this publication in new window or tab >>From geometry to CFD-based aerodynamic derivatives - an automated approach
2010 (English)In: 27th Congress of theInternaitonal Council of the Aeronautical Sciences, 19-24 Sept 2010, Nice, France: Volume 1, 2010, 762-774 p.Conference paper (Refereed)
Keyword
Automated analysis, CFD, Mesh generation
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-31399 (URN)2-s2.0-84878494661 (ScopusID)978-161782049-6 (ISBN)
Conference
27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010; Nice; France; 19 September 2010 through 24 September 2010
Note

QC 20110314

Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2014-08-15Bibliographically approved

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