Erlendur Steinthorsson

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Abstract. Three methods are presented for reducing approximate-factorization (AF) errors that exist in twoand three-factored schemes, such as the popular ADI, LU, and LU-SSOR methods. For problems in which AF errors are larger than both time-discretization and time-linearization errors, these methods can be used to lower the AF errors so that larger(More)
A numerical scheme for simulation of unsteady, viscous, compressible flows is considered. The scheme employs an explicit discretization of the inviscid terms of the N avier-Stokes equations and an implicit discretization of the viscous terms. The discretization is second order accurate in both space and time. Under appropriate assumptions, the implicit(More)
A methodology for accurate ana efficient simulation of unsteady, compressible flows is presented. The cornerstones of the methodology are a. special discretization of the N avier-Stokes equa.tions on structured bodyfitted grid systems and an efficient solution-adaptive mesh refinement technique for structured grids. The discretization employs an explicit(More)
Generating high quality, structured, continuous, body-fitted grid systems (multiblock grid systems) for complicated geometries has long been a most laborintensive and frustrating part of simulating flows in complicated geometries. Recently, new methodologies and software have emerged that greatly reduce the human effort required to generate high quality(More)
In this paper, the effect of atomizer geometry on the flow in simplex atomizers and atomizer performance is numerically investigated. A computational model based on the Arbitrary-Lagrangian-Eulerian method has been used. The effect of changes in four non-dimensional geometric parameters on the atomizer performance is studied. These geometric parameters are(More)
Two‐dimensional axisymmetric computational fluid dynamics analyses were conducted to determine the effects of variations in injector geometry, injector swirl angle, flow baffling, and operating pressure on the aerodynamics and mixing characteristics of micro‐mixing cups. The presented results and conclusions concern possible mechanisms for reducing the(More)
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