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SPH - a comparison of neighbor search methods based on constant number of neighbors and constant cut-off radius

Wróblewski P., Kopeć M.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2007

Vol. 11, No 3

273-283

Two methods of neighbor search for the SPH algorithm are presented, based on a constant number of neighbors and a constant cut-off radius. First, feasible methods of comparison were analyzed. Then, the two selected methods were compared visually and computationally. Considering the use of the SPH algorithm for simulating incompressible fluids, the obtained results suggest that the method with a constant cut-off radius is better than that with a constant number of neighbors. The simulation results of both methods are practically indistinguishable, while the computational costs favor one of them.

Two computation methods for oscillatory airfoils

Dumitrescu H., Cardos V.

Applied Mechanics and Engineering

2000

Vol. 5, no 3

593-611

Two commonly used methods for predicting unsteady airloads are: 1) the panel method based on the surface distribution of singularity elements and 2) the indicial method for unsteady problems governed by the linearized partial differential equation and linearized boundary conditions. The panel method considered here involves a piecewise linear continuous distribution of singularities (sources and doublets) over the airfoil surface. Since the linearity assumptions of the indicial method do not allow for variations in the form of the chordwise pressure, this approach seems to be more economical from the computational point of view. The present study is aimed at the systematic assessment of the two approaches by considering a number of unsteady two-dimensional flows. Good agreement was found with measured airloads data for the two methods.