A multipoint viscous design method for multi-element airfoils

Ashok Gopalarathnam, Michael S. Selig

Research output: Contribution to conferencePaperpeer-review


A multipoint viscous inverse method has been developed for the design of multi-element airfoils in incompressible flow. The method allows the designer to prescribe either inviscid velocity distributions or boundary-layer developments over different portions of a multi-element airfoil in a multipoint fashion. In addition, geometric parameters such as airfoil thickness and camber for each element can be specified. The design method uses a hybrid approach to determine the shapes of the individual elements that satisfy these design specifications. Each element of the multi-element airfoil is generated using an inverse code for isolated airfoil design. A two-dimensional panel method is used to obtain the velocity distributions over the resulting multi-element airfoil in inviscid flow. A direct integral boundary-layer method is then used to obtain the boundary-layer development over the multi-element airfoil. Using Newton iteration, the velocity distributions over portions of the airfoils in isolation are then used as design variables to achieve the velocity and the boundary-layer specifications on the multi-element airfoil. A key feature of the method is a novel scheme developed for rapid computation of the sensitivities for the Newton iteration. As demonstrated in the paper, this scheme results in significant reductions in computation time.

Original languageEnglish (US)
Number of pages10
StatePublished - 1998
Event16th AIAA Applied Aerodynamics Conference, 1998 - Albuquerque, United States
Duration: Jun 15 1998Jun 18 1998


Other16th AIAA Applied Aerodynamics Conference, 1998
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Engineering(all)


Dive into the research topics of 'A multipoint viscous design method for multi-element airfoils'. Together they form a unique fingerprint.

Cite this