RODTRAC

Robustness of distributed micron-sized roughness-element for transition control

Coordinatore	KUNGLIGA TEKNISKA HOEGSKOLAN    more  Organization address address: Valhallavaegen 79 city: STOCKHOLM postcode: 10044 contact info Titolo: Ms. Nome: Hide Cognome: Hornk Email: send email Telefono: +46 8 790 7128 Fax: +46 8 7907577
Nazionalità Coordinatore	Sweden [SE]
Totale costo	500˙000 €
EC contributo	375˙000 €
Programma	FP7-JTI Specific Programme "Cooperation": Joint Technology Initiatives
Code Call	SP1-JTI-CS-2011-01
Funding Scheme	JTI-CS
Anno di inizio	2012
Periodo (anno-mese-giorno)	2012-08-01   -   2015-09-30

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	KUNGLIGA TEKNISKA HOEGSKOLAN  Organization address address: Valhallavaegen 79 city: STOCKHOLM postcode: 10044 contact info Titolo: Ms. Nome: Hide Cognome: Hornk Email: send email Telefono: +46 8 790 7128 Fax: +46 8 7907577	SE (STOCKHOLM)	coordinator	299˙398.50
2	TOTALFORSVARETS FORSKNINGSINSTITUT  Organization address address: Gullfossgatan 6 city: STOCKHOLM postcode: 164 90 contact info Titolo: Ms. Nome: Ingrid Cognome: Wiklund Email: send email Telefono: +46 8 5550 3197	SE (STOCKHOLM)	participant	75˙601.50

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 Obiettivo del progetto (Objective)

'Transition control in three-dimensional flows by means of distributed Micron-Sized Roughness-elements (MSR) has been under focus during the last decade. The successful experiments of Prof. Saric and his research group have created lot of attentions and interest. In the reported work by Saric et al. always a significant positive effect of MSR on delay of transition has been observed. Similar attempts to control transition in three-dimensional flows by means of MSR have not been successful in the same degree. It has argued that the differences in the outcome of the experiments may be due to small differences in the level of noise (acoustic and free-stream turbulence) in the wind tunnels used in the experiments.

To our knowledge there are no investigations that really address the sensitivity and robustness of the MSR for transition control in three-dimensional flows. The objective of the proposed activities is to, numerically and experimentally address these issues.

The carefully performed numerical simulations will allow us to characterize the effects of acoustic and vortical perturbations separately or simultaneously. A controlled variation of level of ‘noise’ will make it possible to understand the limitations of the MSR approach. The direct numerical simulations will be accompanied with the non-linear stability calculations using the Parabolised Stability Equations (PSE). These calculations are much faster and cheaper in terms of computational costs. This will make it possible to do a wide variation of parameters.

Carefully performed experimental investigations in a low-disturbance environment will also generate valuable information and data. Experiments with controlled acoustic perturbations and turbulence level will complete the direct numerical simulations and will be used to validate the numerical results.'