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T. Kornicki, C. Volko, M. Kornicki, U. Pont:
"Numeric thermal bridges simulation: Approaching optimized usability for sloped and rounded shapes.";
Applied Mechanics and Materials (eingeladen), Special Volume: Energy Saving and Environmentally Friendly Technologies - Concepts of Sustainable Building (2016), 824; S. 527 - 535.

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Computational numeric thermal bridge simulation can be considered a state-of-the-art
technology for evaluating the thermal behavior of building component intersections. Conductive
processes (and with some restrictions convective and radiative processes as well) inside of building
details can be evaluated; Such analyses can help improve and optimize constructions. This can be
necessary to ensure the durability of constructions and to avoid increased heat flow, low surface
temperatures, and condensation problems. Numeric simulation tools regularly use finite differences
methods, which approximate reality to a high degree. This requires the geometrical representation
of such a thermal bridge to be discretized as a uniform grid. This - as a consequence - requires
models that are reduced to strictly orthogonal structures, which has a large impact on the modelling
of building joints with sloped or rounded surfaces and elements. Such elements need to be
simplified to orthogonal elements, resulting in step-by-step representations of slopes and
curvatures. While the accuracy of thermal bridge simulations is considered sufficient, the modelling
efforts of such details and their simplification often represent a time-consuming and error-prone
activity.
In this context, the contribution presents recent efforts in the development of the state-of-the-art
tool AnTherm (www.antherm.eu) that allow the automated generation of slope and curvature
representations within the modelling canvas of the tool. As a consequence, the modelling and
simplification of sloped and rounded elements can be done fast and with a high degree of accuracy.
This contribution describes the general method, its implementation, an analysis of the overall
usability of the approach, modelling examples and an outlook to future developments.

numeric thermal bridges simulation, geometry simplification, sloped and rounded surfaces