Viscous transonic flow over airfoils

Wai, J. C.; Yoshihara, Hideo

doi:10.1007/3-540-10694-4_64

Cited by 1 publication

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“…More efficient inviscid algorithms (e.g., alternating-direction implicit or approximate factorization schemes) are available that could remedy that aspect of the problem. But even without modifying the inviscid algorithm, some improvement of the global convergence could be achieved by simultaneous calculation of the inviscid and viscous equations in the manner of, for example, Wai and Yoshihara [37] but without their viscous ramp model of shock/boundary-layer interaction. Another advantage of that approach would be the elimination of the necessity of specifying an initial guess for the mass flux defect when separation is encountered.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Viscous/Inviscid Computations of Transonic Separated Flows Over Solid and Porous Cascades

Olling

Dulikravich

1986

Volume 1: Turbomachinery

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A complete viscous-inviscid interaction is performed that reliably computes steady two-dimensional, subsonic and transonic attached and separated flows for cascades of airfoils. A full-potential code was coupled with both a laminar/transition/ turbulent integral boundary-layer/turbulent wake code and the finite-difference boundary-layer code using the semiinverse methods of Carter and Wigton. The transpiration coupling concept was applied with an option for a porous airfoil with passive and active physical transpiration. Examples are presented which demonstrate that such flows can be calculated with engineering accuracy by these methods. Carter's update formula gives smoother solutions for a strong shock that Wigton's update formulas, although Wigton's formulas are preferred in the early coupling cycles. The computations show that passive physical transpiration can lead to a lower drag coefficient and higher lift coefficient, a weaker shock and elimination of shockinduced separation. The extent of the porous region and permeability factor distribution of the porous region must be chosen carefully if these improvements are to be achieved.

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Section: Conclusion and Recommendationsmentioning

confidence: 99%