Boundary layer method for unsteady transonic flow

Majić, Frane and Voss, Ralph and Virag, Zdravko (2012) Boundary layer method for unsteady transonic flow. = Boundary layer method for unsteady transonic flow. Strojniški Vestnik/Journal of Mechanical Engineering, 58 (7-8). pp. 470-481. ISSN 0039-2480. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q2 (2012). Točan broj autora: 3.

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Abstract

A numerical method for determination of unsteady loads in a 2-D transonic flow, with the occurrence of a shock wave, on a pitching airfoil is demonstrated. The method implements the Euler equations for inviscid region and integral boundary layer equations for the viscous region near the airfoil. The viscous-inviscid interaction method is employed using the transpiration velocity concept on the airfoil contour. The Euler solution is calculated by using the Van Leer flux-vector splitting method on the body-fitted C-grid. The boundary layer model is calculated applying Drela's model of integral boundary layer equations for the laminar and turbulent flow. The transition from the laminar to the turbulent flow is predicted by the en method. The viscous-inviscid interaction method is made in the direct mode. The results obtained by this method are comparable with the calculated RANS and experimental results, while time and computational costs were lower than for RANS calculations. Generally, the pressure coefficient distribution results showed good agreement with the RANS and experimental results. The method predicted the position of a shock wave to be slightly shifted towards the leading edge of the airfoil with respect to the position obtained by the RANS and experimental results. This indicates that the boundary layer model has a strong influence on the inviscid part of the flow. © 2012 Journal of Mechanical Engineering. All rights reserved.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Airfoil contours; Boundary layer methods; Boundary layer models; Computational costs; Direct mode; En method; Euler solutions; Flux-vector splitting; Integral-boundary-layer equations; Laminar and turbulent flow; Leading edge; Pitching airfoils; Pressure coefficient distribution; Transition prediction; Transpiration velocity; Unsteady loads; Viscous region; Viscous-inviscid interaction; Boundary layers; Euler equations; Navier Stokes equations; Shock waves; Transonic flow; Transpiration; Turbulent flow; Airfoils
Subjects: TECHNICAL SCIENCE
Divisions: 1300 Department of Aeronautical Engineering > 1310 Chair of Aerodynamics
1400 Department of fluid mechanics > 1410 Chair of computer fluid mechanics
Indexed in Web of Science: Yes
Indexed in Current Contents: No
Quartiles: Q2 (2012)
Date Deposited: 28 Apr 2015 12:46
Last Modified: 05 Jun 2017 11:09
URI: http://repozitorij.fsb.hr/id/eprint/3939

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