Hydrogeology of an urban weathered basement aquifer in Kampala, Uganda

Weathered basement aquifers are vital sources of drinking water in Africa. In order to better understand their role in the urban water balance, in a weathered basement aquifer in Kampala, Uganda, this study installed a transect of monitoring piezometers, carried out spring flow and high-frequency groundwater level monitoring, slug tests and...

Final results from the EU project AVATAR: Aerodynamic modelling of 10 MW wind turbines

This paper presents final results from the EU project AVATAR in which aerodynamic models are improved and validated for wind turbines on a scale of 10 MW and more. Special attention is paid to the improvement of low fidelity engineering (BEM based) models with higher fidelity (CFD) models but also with intermediate fidelity free vortex wake ...

Experimental benchmark and code validation for airfoils equipped with passive vortex generators

Experimental results and complimentary computations for airfoils with vortex generators are compared in this paper, as part of an e_ort within the AVATAR project to develop tools for wind turbine blade control devices. Measurements from two airfoils equipped with passive vortex generators, a 30% thick DU97W300 and an 18% thick NTUA T18 have been...

Research and Development Activities on Pile Foundations in Europe

The paper describes some recent field test programmes performed across Europe. Given the increased need to develop alternative, clean energy sources the paper presents details of R&D programmes with a focus on reducing costs offshore developments and increases safety. Work on the development of design codes for large diameter piles is...

Computing the flow past Vortex Generators: Comparison between RANS Simulations and Experiments

The flow around a wind turbine airfoil equipped with Vortex Generators (VGs) is examined. Predictions from three different Reynolds Averaged Navier Stokes (RANS) solvers with two different turbulence models and two different VG modelling approaches are compared between them and with experimental data. The best results are obtained with the more...

On the Regulation of Life Safety Risk

The present paper takes up the issue of appropriate choice of metric for life safety and health related risks in a regulatory context addressing effects of temporal and spatial scales for their consistent quantification and comparison across societal sectors, industries and application areas. Starting point is taken in a short outline of what is...

A linear design model for wave filtering and dynamic positioning

Accelerating the LSTRS Algorithm

The LSTRS software for the efficient solution of the large-scale trust-region subproblem was proposed in [M. Rojas, S. A. Santos, and D. C. Sorensen, ACM Trans. Math. Software, 34 (2008), article 11]. The LSTRS method is based on recasting the problem in terms of a parameter-dependent eigenvalue problem and adjusting the parameter iteratively....

Accelerating the LSTRS algorithm

The LSTRS software for the efficient solution of the Large-Scale Trust-Region Subproblem was proposed in [Rojas, Santos, Sorensen: ACM ToMS 34 (2008), Article 11]. The LSTRS method is based on recasting the problem in terms of a parameter-dependent eigenvalue problem and adjusting the parameter iteratively. The essential work at each iteration...

Efficient numerical methods for the least-norm regularization

Actuator disc momentum theory for low lambda rotors

IEA wind annex XX: HAWT aerodynamic and models from wind tunnel measurements - final report

Ag+-Beta''-Alumina Solid-Electrolyte So(X) Sensor with Metal Silver as a Solid Reference Electrode

Na2SO4-based solid electrolytes for SOx sensors

Electrochemical SO sub x and NO sub x sensors with Ag super plus -beta double prime -alumina as solid electrolyte and Ag as solid reference electrode

Hydraulic performance of berm breakwaters

Rubble mOlJnd breakwaters have been used for centuries for the protection of harbours. In many cases breakwaters were built in relatively deep water and exposed to waves too severe in relation to the size of rock used for construction. Furthermore, they were often built with a steep slope, and consequently, severe damage occurred. In some cases,...

The Marine Systems Simulator State-Space Model representation for Dynamically Positioned Surface Vessels