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PhD Scholarship in Physics at KTH

KTH Royal Institute of Technology is offering a PhD scholarship in Physics. Applications will be accepted at any time until the position is filled. 

Due to the continuous growth of wind energy around the world, there is a great need to understand the fundamental properties of wind-farm flows and its related flow physics in order to be able to enhance the prediction capabilities that are important in the design of the farms. Within the framework program " Flow physics of complex wind farms " we will study the details of the flow behind wind turbines, how a wind turbine affects the next turbine in a park, and how the turbulence in the atmosphere influences the wind park. We will concentrate on a number of basic research questions that provide an understanding of the flow physics phenomena associated with wind-farm flow. Some important questions are; how are ordered structures created in the flow behind a wind turbine; how do the spiral vortices from the tips break down into turbulent flow; what are the resulting forces acting on the turbine blades, how does the stability of the atmosphere influence the flow behind a turbine, and how does the wind farm influence the atmospheric boundary layer.

We will use the most modern and accurate computational and experimental methods to acquire as detailed flow physics knowledge as possible. Efficient computational methods that we use in other contexts will be adapted to flows around single turbines and wind farms and run on the largest national and international supercomputers. The experiments will mainly be carried out with scale models in wind tunnels. The two open positions are part of a larger research cluster of wind energy related projects where other Ph.D. students and postdocs will be involved at KTH providing a unique opportunity to directly compare experimental and numerical results and a fruitful collaborative environment. The following two doctoral positions in Fluid Mechanics are open for applicants.

Project 1: Simulations of wind turbines in atmospheric boundary layers
This project deals with the simulation of the atmospheric boundary layer numerically using either fully spectral or spectral-element discretisations. Numerical aspects regarding the code as well as Large-Eddy simulation methodology will be part of the project. The numerical model is then validated for a number of stable and unstable atmospheric conditions. Furthermore, different surface-roughness conditions will be implemented and assessed, which are representative of different terrains. In addition, real terrain level changes will be included in the simulations. Once the atmospheric model is established, a model of the wind turbines are introduced, mainly based on the actuator-line method, and mutual interactions are studied. The active interaction with Project 2, including cross-validation, is an important part of the project.

Project 2: Experimental investigations of flows in wind farms
Wind-tunnel experiments will be carried out to investigate wind-farm flows under various conditions (i.e. with different turbine spacing, arrangement, inflow properties, roughness and topography). The complex coupling between the unperturbed atmospheric boundary layer and the wind farm will be investigated experimentally, using hot-wire anemometry and Particle Image Velocimetry (PIV) for the mean velocity and turbulence measurements. These results through active interaction with Project 1 will be used to improve the existing industrial models of wind farms and, but also with the aim to develop new low-order wake model with few degrees of freedom of interacting wind turbines will be developed.

Application Requirements
We seek highly motivated candidates holding a Master of Science degree in engineering or applied physics, mechanical engineering, applied mathematics or related areas, as well as excellent skills in oral and written communication in English.

Only candidates with outstanding grades and background in mathematics and physical disciplines can be considered; previous exposure to HPC or experimental methods and fluid mechanics is advantageous. Also, the applicants should possess the ability to work independently. Applicants about to finish their M.Sc. degrees may be considered for the position.

How to apply?
Log into KTH 's recruitment system in order to apply to this position. You are the main responsible to ensure that your application is complete according to the ad. Your complete application must be received at KTH no later than the last day of application.

The application must contain the following documents in PDF format.
- Statement of professional interest.
- CV.
- Transcripts from university/university college.
- Example of technical writing, e. g., thesis, essay, course report or scientific paper. It should be clearly stated which of the projects (1 or 2) the applicant is applying for.

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