FORMA SIMETRICA DE LA CONDICION DE CONTORNO ABSORBENTE DNL PARA EL PROBLEMA DE LA RESISTENCIA DE OLA EN BARCOS

STORTI, MARIO; D'ELÍA, JORGE; IDELSHON, SERGIO

METODOS NUMERICOS PARA CALCULO Y DESENO EN INGENIERIA

UNIV POLITECNICA CATALUNYA

Lugar: Barcelona; Año: 1997 vol. 14 p. 515 - 530

0213-1315

In a previous work we presented a numerical algorithm based on centered Finite Elements with absorbing boundary conditions (which we call DNL, for Discrete Non-Local) for the ship wave resistance problem. As no numerical viscosity is added, this method yields very well defined resistance curves as a function of Froude number and allows calculation of the resistance from a momentum flux balance at the outlet plane. However, due to the nature of the absorbing conditions, the resultant system is non-symmetric and for the factorization. In this work we show how the system can be solved by only factorizing a symmetric matrix with approximately the same band-width of a typical FEM matrix.