Abstract
Using an approximate approach /1/, methods of determining the vortex drag on plates undergoing harmonic oscillations in an incompressible fluid are considered. By means of this approach, the problem can be reduced to determining the velocity intensity coefficients (VIC's) on the edges of the plates and computing a certain integral over the boundary contour. Mathematically, the VIC's are analogous to the stress intensity coefficients (SIC's) /2/ in destruction mechanics. The most important exact solutions and closed expressions for the VIC's are presented for the planar and the spatial problems. To obtain numerical solutions, a version of the direct boundary-element method (BEM) is developed. Examples of applications of the finite-element method (FEM) and the BEM to specific problems are given. Methods for improving the accuracy of the numerical solutions are proposed. The results of experimental investigations are presented and compared with the computations.
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