http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/87 2026-05-18T23:03:30Z 2026-05-18T23:03:30Z Nguyen, The Duc http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/821 2011-04-20T03:03:16Z 2005-01-01T00:00:00Z

An implicit scheme for incompressible flow computation with artificial compressibility method Nguyen, The Duc 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. VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005

2005-01-01T00:00:00Z Dao, Van Dung Chu, Thi Tam http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/814 2011-04-20T02:57:53Z 2005-01-01T00:00:00Z

On the stability of elastoplastic thin triangular plates made in compressible material Dao, Van Dung; Chu, Thi Tam 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. VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005

2005-01-01T00:00:00Z Pham, Thi Hong Loan Dam, Van Nhi http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/807 2011-04-20T02:50:24Z 2005-01-01T00:00:00Z

The hypersurface sections and points in uniform position Pham, Thi Hong Loan; Dam, Van Nhi 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. VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005

2005-01-01T00:00:00Z Nguyen, Thanh Quang Phan, Duc Tuan http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/805 2011-04-20T02:45:43Z 2005-01-01T00:00:00Z

Generlied Mason's theorem Nguyen, Thanh Quang; Phan, Duc Tuan The purpose of this paper is to give a generalization of Mason's theorem by the Wronskian technique over fields of characteristic 0. VNU. JOURNAL OF SCIENCE, Mathematics - Physics. Vol. 21, No. 4 - 2005

2005-01-01T00:00:00Z