http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/87 2026-05-18T00:22:37Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/821 Title: An implicit scheme for incompressible flow computation with artificial compressibility method Authors: Nguyen, The Duc Abstract: To simulate the incompressible flow in complex three-dimensional geometry efficiently and accurately, a solver based on solution of the Navier-Stokes equations in the generalized curvilinear coordinate system was developed. The system of equations in three-dimension are solved simultaneously by the artificial compressibility method. The convective terms are differenced using a flux difference splitting approach. The viscous terms are differenced using second-order accurate central differences. An implicit line relaxation scheme is employed to solve the numerical system of equations. The solver was tested for two cases including flow past a circular cylinder and flow around a hemispherical head of a cylindrical object. Description: VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005 2005-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/814 Title: On the stability of elastoplastic thin triangular plates made in compressible material Authors: Dao, Van Dung; Chu, Thi Tam Abstract: The stability problem of thin triangular plates by the small elastoplastic deformation theory, was studied in [3]. Basing on the theory of elastoplastic processes, this problem again has been investigated in [4] with incompressible material. In this paper we continue to study the mentioned problem with compressible material. The relation for determining critical forces is established. In particular the explicit expression of the critical force for the linear hardening material is found. Some numerical calculations have been given and discussed. Description: VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005 2005-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/807 Title: The hypersurface sections and points in uniform position Authors: Pham, Thi Hong Loan; Dam, Van Nhi Abstract: The aim of this paper is to show that the preservation of irreducibility of sections between a variety and hypersurface by specializations and almost all sections between a linear subspace of dimension $h=n-d$ of ${\Bbb P}^n_k$ and a nondegenerate variety of dimension $d>0$ consists of $s$ points in uniform position. Description: VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005 2005-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/805 Title: Generlied Mason's theorem Authors: Nguyen, Thanh Quang; Phan, Duc Tuan Abstract: The purpose of this paper is to give a generalization of Mason's theorem by the Wronskian technique over fields of characteristic 0. Description: VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005 2005-01-01T00:00:00Z