Slender profiles flying at nearly sonic speed exhibit a peculiar shock pattern, which is commonly referred to in literature as the "fishtail" shock structure. It consists of two oblique shock waves that originate at the trailing edge of the airfoil and interact with a detached, nearly normal shock wave in two triple points located along the oblique shocks. Making use of both shock-fitting and shock-capturing CFD simulations and classical shock polar analysis, we prove that, in the case of a NACA0012 airfoil, the two interaction points cannot be modeled using the three shocks theory that von Neumann developed nearly a century ago to describe triple points arising in Mach reflections. Our analysis suggests that the four-wave interaction model proposed by Guderley should be used instead.

Features of "fishtail" shock interaction in transonic flows on a NACA0012 Profile / Paciorri, R; Bonfiglioli, A; Assonitis, A. - In: AIAA JOURNAL. - ISSN 0001-1452. - 62:6(2024), pp. 2051-2062. [10.2514/1.J063692]

Features of "fishtail" shock interaction in transonic flows on a NACA0012 Profile

Paciorri, R
Primo
Conceptualization
;
Assonitis, A
Ultimo
Data Curation
2024

Abstract

Slender profiles flying at nearly sonic speed exhibit a peculiar shock pattern, which is commonly referred to in literature as the "fishtail" shock structure. It consists of two oblique shock waves that originate at the trailing edge of the airfoil and interact with a detached, nearly normal shock wave in two triple points located along the oblique shocks. Making use of both shock-fitting and shock-capturing CFD simulations and classical shock polar analysis, we prove that, in the case of a NACA0012 airfoil, the two interaction points cannot be modeled using the three shocks theory that von Neumann developed nearly a century ago to describe triple points arising in Mach reflections. Our analysis suggests that the four-wave interaction model proposed by Guderley should be used instead.
2024
dynamic pressure; computational fluid dynamics; prandtl meyer function; numerical simulation; shock waves; von neumann theory; shock-fitting; guderley model; shock interactions; naca airfoil
01 Pubblicazione su rivista::01a Articolo in rivista
Features of "fishtail" shock interaction in transonic flows on a NACA0012 Profile / Paciorri, R; Bonfiglioli, A; Assonitis, A. - In: AIAA JOURNAL. - ISSN 0001-1452. - 62:6(2024), pp. 2051-2062. [10.2514/1.J063692]
File allegati a questo prodotto
File Dimensione Formato  
Paciorri_preprint_Features_Fishtail_Shock_2024.pdf

accesso aperto

Note: https://arc.aiaa.org/doi/10.2514/1.J063692
Tipologia: Documento in Pre-print (manoscritto inviato all'editore, precedente alla peer review)
Licenza: Creative commons
Dimensione 4.43 MB
Formato Adobe PDF
4.43 MB Adobe PDF
paciorri_Features_2024.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 6.6 MB
Formato Adobe PDF
6.6 MB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1713475
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
social impact