A higher order panel method applied to vortex sheet roll-up

AIAA Journal ◽  
1983 ◽  
Vol 21 (4) ◽  
pp. 516-523 ◽  
Author(s):  
H. W. M. Hoeijmakers ◽  
W. Vaatstra
2003 ◽  
Vol 47 (04) ◽  
pp. 290-298
Author(s):  
Chang-Sup Lee ◽  
Justin E. Kerwin

A higher-order panel method based on B-spline representation for both the geometry and the solution is developed for the solution of the flow around two-dimensional lifting bodies. The influence functions due to the normal dipole and the source are separated into the singular and nonsingular parts; then the former is integrated analytically, whereas the latter is integrated using Gaussian quadrature. Through a desingularization process, the accuracy of the present method can be increased without limit to any order by selecting a proper numerical quadrature. A null pressure jump Kutta condition at the trailing edge is found to be effective in stabilizing the solution process and in predicting the correct solution. Numerical experiments indicate that the present method is robust and predicts the pressure distribution around lifting foils with far fewer panels than existing low-order panel methods.


1997 ◽  
Vol 41 (01) ◽  
pp. 81-92
Author(s):  
Sangwoo Pyo ◽  
Spyros A. Kinnas

An algorithm for predicting the complete three-dimensional vortex sheet roll-up is developed. A higher order panel method, which combines a hyperboloidal panel geometry with a bi-quadratic dipole distribution, is used in order to accurately model the highly rolled-up regions. For given radial circulation distributions, the predicted wake shapes are shown to be convergent and consistent with those predicted from other methods. Then, a previously developed flow-adapted grid and the three-dimensional wake sheet roll-up algorithm are combined in order to estimate the propeller loading/trailing wake interaction. The complete wake geometry is determined by the method without the need of any experimental information on the shape of the wake. Predicted forces and tip vortex trajectories are shown to agree well with those measured in experiments.


1980 ◽  
Vol 17 (1) ◽  
pp. 38-44 ◽  
Author(s):  
E. N. Tinoco ◽  
F. T. Johnson ◽  
L. M. Freeman
Keyword(s):  

2007 ◽  
Vol 34 (14-15) ◽  
pp. 2045-2060 ◽  
Author(s):  
G.-D. Kim ◽  
C.-S. Lee ◽  
J.E. Kerwin

Author(s):  
Chang-Sup Lee ◽  
Byoung-Kwon Ahn ◽  
Gun-Do Kim ◽  
Hyun Yup Lee ◽  
Do-Chun Hong

A B-spline based higher order panel method (hereinafter, HiPan) is developed for the motion of bodies in ideal fluid, either of infinite extent or with free boundary surface. In this method, both the geometry and the potential are represented by B-splines, and it guarantees more accurate results than most potential based panel methods. In the present work, we apply the HiPan, which differs with the works at MIT in evaluating the induction integrals, to two major marine hydrodynamic problems: analysis of propulsive performance of the marine propellers and the motion of the floating bodies on the free surface. The present HiPan is shown superior to the constant panel method (hereinafter, CoPan) in predicting flow quantities in the area of the thin trailing edge and blade tip of the propeller. Numerical results are validated by comparison with experimental measurements.


1978 ◽  
Author(s):  
F. EHLERS ◽  
M. EPTON ◽  
F. JOHNSON ◽  
A. MAGNUS ◽  
P. RUBBERT

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