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SUMMARY:A new formalism for improving predictions with RANS eddy viscosity
  models
DTSTART:20251006T120000Z
DTEND:20251006T130000Z
DTSTAMP:20260613T211200Z
UID:indico-event-18010@indico.psi.ch
CONTACT:jan.kren@psi.ch
DESCRIPTION:Speakers: Yves Tessier Urrecha (Università degli Studi di Mod
 ena e Reggio Emilia)\n\nAbstract:RANS (Reynolds-Averaged Navier-Stokes) ed
 dy viscosity models to approximate the mean flow behaviour are the preferr
 ed solution in engineering applications\, yet their inability to capture t
 urbulent fluctuations and their difficulties with laminar and transitional
  flows — due to their tendency to overpredict stresses in adverse pressu
 re gradients — represent a hefty trade-off for their low cost.We stand o
 n a theoretical framework interpreting the effect of the turbulent stress 
 introduced by RANS eddy viscosity models as that of an implicit temporal f
 ilter\, to derive a dynamic procedure for the definition of the cμ coeff
 icient in the calculation of the eddy viscosity. The procedure is fully au
 tomatic and requires no empirical coefficients or calibration\, and it see
 ks to allow the model to resolve turbulent fluctuations supported by the s
 patial resolution and to adapt to laminar and transitional flows\, prevent
 ing the overprediction of stresses. Results on the Benchmark on the Aerody
 namics of a Rectangular Cylinder and the ERCOFTAC T3L suggest that both ob
 jectives are achieved.\nBio:Yves earned his Master’s degree in Advanced 
 Automotive Engineering – Racing Car Design from the University of Modena
  and Reggio Emilia in 2022\, and followed it with a research project on th
 e aerodynamic instabilities that lead to proposing in modern F1 cars. Stil
 l at UniMoRe\, he enrolled in the "Enzo Ferrari" PhD Course in Mechanical 
 and Vehicle Engineering at the end of 2023\, resuming his work on the Dyna
 mic Tensorial Eddy Viscosity Model (TVM). The development of turbulence mo
 delling solutions has been the main focus of his research\, with the tempo
 ral filtering formalism for RANS eddy viscosity models currently at the fo
 refront of his work. In January\, he will shift the focus of his studies t
 o racecar aerodynamics for the final year of his PhD programme.\n\nhttps:/
 /indico.psi.ch/event/18010/
LOCATION:OHSA/E13
URL:https://indico.psi.ch/event/18010/
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