Hornikx’ research area is modeling sound propagation in the built environment and his research interests are: Development of efficient numerical methodologies for sound propagation with the built environment as application, that is urban sound propagation, vibro-acoustics and room acoustics;Application of numerical models to investigate propagation effects as the role of vegetation on sound propagation outdoors and indoors,the influence of meteorological effects on sound propagation;Auralization from wave-based methods and hybrid wave-based/geometrical acoustics techniques;Auralization for human echolocation; Publishing open source software from developed methods