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An accurate boundary value problem solver applied to scattering from cylinders with corners

In this paper we consider the classic problem of scattering of waves from perfectly conducting cylinders with piecewise smooth boundaries. The scattering problems are formulated as integral equations and solved using a Nyström scheme, where the corners of the cylinders are efficiently handled by a method referred to as Recursively Compressed Inverse Preconditioning (RCIP). This method has been ver

Numerical modeling of Swirling Flows in Gas Turbine Burners

The present thesis focuses on the numerical simulation of the flowfield in gas turbine burners. Due to the higher and higher requirements regarding pollutant emissions there is a need for new combustion technologies. In gas turbines one method to obtain low pollutant levels is the use of lean premixed or partially premixed combustion. However, in lean combustion problems regarding the flame stabi

METHODS FOR TRANSBOUNDARY WATER RESOURCES MANAGEMENT IN WATER STRESSED REGIONS – CASE STUDY: SOUTHERN AFRICA

Water resources management in water scarce regions like the Southern Africa Development Community (SADC) is challenging with both large hydro-climatic-induced scarcity and the considerable inter-annual fluctuations at the centre of the allocation problem. Water must be allocated both in time and space using acceptable criteria and most importantly, all stakeholders must adhere to the decisions imp

Experimental Adaptive Optics. A test facility for adaptive optics on a small telescope

Popular Abstract in Swedish Nästa år är det 400 år sedan Galileo Galilei för första gången riktade ett teleskop mot objekt på himlen. Allt sedan dess har teleskopet varit det viktigaste instrumentet för astronomins utveckling och med dess hjälp har vår kunskap om universum revolutionerats. Tack vare utvecklingen av teleskopet under dessa århundraden har allt ljussvagare objekt kunnat studeras, ochThis thesis presents the work on the design of, construction of, and finally observations with, an experimental setup comprising a small telescope equipped with adaptive optics. The facility has been assembled at Lund Observatory, where also observations on the sky have been made. The aim of this project was to gain hands-on knowledge in the development of a real adaptive optics system and eventua