With an aim to investigate the effect of externally imposed body acceleration on two dimensional,pulsatile blood flow through a stenosed artery is under consideration in this article. The blood flow has been assumed to be non-linear, incompressible and fully developed. The artery is assumed to be an elastic cylindrical tube and the geometry of the stenosis considered as time dependent, and a co...

In many single and multi-user MIMO systems, different sorts of symbol mapping are employed. This is of course based on the modulation schemes and/or the pseudo-correlation of the signals. These can be for instance circularly symmetric or non-circular signals which are transmitted. Conventional linear transceiver processing is optimal for circularly symmetric signals but sub-optimal for non-circ...

We present a method for constructing a set of inequalities which describe completely the so–called symmetric solution set Ssym := {x ∈ Rn| Ax = b, A = A ∈ [A], b ∈ [b]}. Here, [A] is an n × n interval matrix satisfying [A] = [A] and [b] is an interval vector with n components.

This paper presents a systematic theoretical and numerical evaluation of three common block preconditioners in a Krylov subspace method for solving symmetric indefinite linear systems. The focus is on large-scale real world problems where block approximations are a practical necessity. The main illustration is the performance of the block diagonal, constrained, and lower triangular precondition...

We offer a systematic study of Krylov subspace methods for solving skew-symmetric linear systems. For the method of conjugate gradients we derive a backward stable block decomposition of skew-symmetric tridiagonal matrices and set search directions that satisfy a special relationship, which we call skew-A-conjugacy. Imposing Galerkin conditions, the resulting scheme is equivalent to the CGNE al...

The present paper deals with the prediction of three-dimensional fluid flow and heat transfer in rib-roughened ducts of square cross-section. Such flows are of direct relevance to the internal cooling system of modern gas turbine blades. The main objective is to assess how a recently developed variant of a cubic non-linear model (proposed by Craft et al. (1999)), that has been shown to produce ...