OPTLAM

Numerical Tool for Aerodynamic Optimization of Laminar Wings

 Coordinatore TOTALFORSVARETS FORSKNINGSINSTITUT 

 Organization address address: Gullfossgatan 6
city: STOCKHOLM
postcode: 164 90

contact info
Titolo: Dr.
Nome: Ardeshir
Cognome: Hanifi
Email: send email
Telefono: 46855503197
Fax: 46855503397

 Nazionalità Coordinatore Sweden [SE]
 Totale costo 202˙330 €
 EC contributo 150˙000 €
 Programma FP7-JTI
Specific Programme "Cooperation": Joint Technology Initiatives
 Code Call SP1-JTI-CS-2009-01
 Funding Scheme JTI-CS
 Anno di inizio 2010
 Periodo (anno-mese-giorno) 2010-01-01   -   2011-04-30

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    TOTALFORSVARETS FORSKNINGSINSTITUT

 Organization address address: Gullfossgatan 6
city: STOCKHOLM
postcode: 164 90

contact info
Titolo: Dr.
Nome: Ardeshir
Cognome: Hanifi
Email: send email
Telefono: 46855503197
Fax: 46855503397

SE (STOCKHOLM) coordinator 113˙947.00
2    KUNGLIGA TEKNISKA HOEGSKOLAN

 Organization address address: Valhallavaegen 79
city: STOCKHOLM
postcode: 10044

contact info
Titolo: Ms.
Nome: Heide
Cognome: Hornk
Email: send email
Telefono: 4687907128
Fax: 4687907128

SE (STOCKHOLM) participant 36˙053.00

Mappa


 Word cloud

Esplora la "nuvola delle parole (Word Cloud) per avere un'idea di massima del progetto.

nlf    numerical    optimization    gradients    layer    boundary    loop    laminar    stability    geometries    transition    foi    equations    kth    efficiently    flow    rans    separation   

 Obiettivo del progetto (Objective)

'The classical numerical approach used for Natural Laminar Flow (NLF) design relies on the experience of the engineers in finding pressure distributions that would improve the extent of laminar flow and could reasonably be approximated in an inverse design phase. Recent initiatives improve this approach, eliminating the “man in the loop”, by including a measure of the laminar flow in the shape optimization problem itself. The numerical solution of such problems with many parameters and constraints is challenging. Our method of optimization for NLF design is an implementation of a gradient-based approach enabling us to efficiently solve problems with many design parameters. The use of CFD, followed by boundary-layer stability analysis, enables to directly find geometries that damp growth of disturbances (which cause transition) in order to delay the laminar-turbulent transition. Moreover, the computation of the gradients is efficiently performed thanks to the work carried out in last years at FOI and KTH on adjoints of the flow and stability equations, making the cost for computing gradients independent of the number of optimization parameters. Our method has been successfully tested for optimization of airfoils and has already come in use in several projects with industrial applications. In the scope of the present project the NLF-optimization toolkit (developed by FOI & KTH) will be extended to three-dimensional geometries. Another important improvement is to include the sensitivities with respect to flow separation because the extension of the laminar boundary layer at cruise can severely penalize the performance of the NLF wing at high angles of attack if laminar separation occurs too early. An attempt will be made to include the Reynolds Averaged Navier-Stokes (RANS) equations as a replacement for the Euler equation in our optimization loop, which involves the use of the adjoint RANS solver already developed by FOI in Edge.'

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