EAI banner


Prof Desta Mebratu

Extraordinary Professor, University of Stellenbosh, South Africa




Dr Lara Allen

CEO: Centre for Global Equality (CGE)
Director of Implementation and Impact: Cambridge Global Challenges Strategic Research Initiative and Affiliated Lecturer: Centre of Development Studies, University of Cambridge




Hirpa G. Lemu, PhD

Professor of Mechanical Design Engineering, Dept. of Mechanical & Structural Engineering and Materials Science, University of Stavanger


Dr. Hirpa Lemu is a Professor of Mechanical Design Engineering at Dept. of Mechanical & Structural Engineering and Materials Science, University of Stavanger (UiS), Norway. He earned his PhD within Computational Intelligence Systems to Integrate CAD/CAM Systems from the Norwegian University of Science and Technology (NTNU) in 2002.  Dr. Lemu’s current research focus is on design optimization of energy converters (gas turbine, wave and wind energy), simulation driven design optimization, modeling and simulation of mechanical systems and material behavior characterization including natural composites and additive manufacturing technologies. He has supervised  over 175 BSc, 40 MSc and 3 PhD candidates. Currently he is supervising 3 PhD candidates. He has also served as a member of PhD evaluation (defense) committee for 15 PhD candidates at different institutions in Norway and abroad. He has published over 150 peer reviewed articles in reputed journals and international conferences. Dr. Lemu is director of the 3D Printing lab that he founded in 2008 and currently this lab is equipped with diverse advanced 3D printing and 3D scanning tools. Dr. Lemu is the initiator and organizer of an International Conference entitled “COTech – Computational Methods in Offshore Technology”, which is organized this year (November 2019) for the second time. He has been initiator and leader of several collaborative projects with many universities in Europe and North America. Dr. Lemu serves as an Editor and Reviewer of several International Journals and Scientific Committee member of several International Conferences.

Title:  Design Optimization of Energy Converters Using High-dimensional and Nature Inspired Approaches

A number of novel strategies that are nature inspired are recently proposed for the shape optimization procedures using metamodel-based decomposition algorithm for High-dimensional, Expensive and Black-box (HEB) design problems. For complex aerodynamic profile optimization process, for instance, a metamodel named High Dimensional Model Representation (HDMR) that utilizes decomposition of design variables in a HEB design problem is suggested. The power of this approach is the ability to combine a Non-Uniform Rational B-Spline (NURBS) driven parametric geometry description, a two-dimensional flow analysis, and a Genetic Algorithm (GA)-based optimization route. In addition, different simulation tools such as computational fluid dynamics (CFD) and finite element analysis (FEA) as well programming tools such as MATLAB and COMSOL are integrated with the parametric description models. In this keynote presentation, the research work done in our research team on application of the metamodel HDMR to optimize the design optimization of gas turbine blades and micro hydropower turbines is presented.

Keyword: Design optimization, Energy converter, Genetic algorithm, High dimensional model representation, Metamodel-based decomposition, Nature inspired approach

For further information: www.ux.uis.no/~hirpa/;

EAI Institutional Members