Unsteady vorticity–streamfunction algorithm for external flows

Sørensen, Jens Nørkær; Nygreen, Per Jørgen

doi:10.1016/s0045-7930(00)00004-9

Cited by 6 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To check the ability of the present model to cope with unsteady flows, the computed unsteady forces are compared to the results from the Navier-Stokes code by Sørensen and Nygreen. 50 C-grid with 382 cells along the circumferential and 65 along the normal direction. The viscous-inviscid interactive code is in this case discretized using 140 panels with a cosine distribution around the airfoil contour.…”

Section: D Unsteady Computationsmentioning

confidence: 99%

“…The measurements were performed in the Handley-Page low-speed closed-circuit wind tunnel. To check the ability of the present model to cope with unsteady flows, the computed unsteady forces are compared to the results from the Navier-Stokes code by Sørensen and Nygreen 50. This code is based on a vorticity-stream function formulation of the Navier-Stokes equations running with the Spallart-Allmaras turbulence model.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A strong viscous-inviscid interaction model for rotating airfoils

2013

View full text Add to dashboard Cite

Two-dimensional (2D) and quasi-three dimensional (3D), steady and unsteady, viscous-inviscid interactive codes capable of predicting the aerodynamic behavior of wind turbine airfoils are presented. The model is based on a viscous-inviscid interaction technique using strong coupling between the viscous and inviscid parts. The inviscid part is modeled by a 2D panel method, and the viscous part is modeled by solving the integral form of the laminar and turbulent boundarylayer equations with extension for 3D rotational effects. Laminar-to-turbulent transition is either forced by employing a boundary-layer trip or computed using an e n envelope transition method. Validation of the incompressible 2D version of the code is carried out against measurements and other numerical codes for different airfoil geometries at various Reynolds numbers, ranging from 0:9 10 6 to 8:2 10 6 . In the quasi-3D version, a parametric study on rotational effects induced by the Coriolis and centrifugal forces in the boundary-layer equations shows that the effects of rotation are to decrease the growth of the boundary-layer and delay the onset of separation, hence increasing the lift coefficient slightly while decreasing the drag coefficient.

show abstract

Section: D Unsteady Computationsmentioning

confidence: 99%

mentioning

confidence: 99%