@article{GeierPiesche, author = {Geier, Stephanie and Piesche, Manfred}, title = {Coupled Macro and Micro-scale Modeling of Polyurethane Foaming Processes}, series = {The Journal of Computational Multiphase Flows}, journal = {The Journal of Computational Multiphase Flows}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-24838}, abstract = {Polyurethane foam is used for manufacturing different kinds of products, such as refrigerators, car dashboards or steering wheels. First, we developed a macro-scale simulation tool that is able to predict foam flow in such complex molds. Depending on the location within a product, final properties of polyurethane foams may vary significantly. These properties (e.g. thermal conductivity or impact strength) are strongly dependent on local foam structure. Modeling complex geometries like refrigerators completely on bubble scale is neither possible nor would it be efficient. The computational effort would be enormous. Therefore, we developed a micro-scale model describing bubble growth and the evolution of the foam microstructure in polyurethane foams considering a limited number of bubbles in a representative volume. Finally, we coupled our macro and micro-scale simulation approaches. For that purpose, we introduced tracer particles into our mold filling simulations. We are able to record information about density and temperature changes or varying flow conditions along particle trajectories. This information is then used to set up corresponding simulations on bubble scale. Through this coupling, a basis for studying the evolution of the local foam microstructure in complex geometries is provided.}, language = {en} } @inproceedings{GeierPiesche, author = {Geier, Stephanie and Piesche, Manfred}, title = {Macro and micro scale modeling of polyurethane foaming processes}, series = {29th International Conference of the Polymer Processing Society, PPS-29, N{\"u}rnberg, 2013}, booktitle = {29th International Conference of the Polymer Processing Society, PPS-29, N{\"u}rnberg, 2013}, language = {en} } @article{GeierChristianPiesche, author = {Geier, Stephanie and Christian, Winkler and Piesche, Manfred}, title = {Numerical Simulation of Mold Filling Processes with Polyurethane Foams}, series = {Chemical Engineering Technology}, volume = {32}, journal = {Chemical Engineering Technology}, number = {9}, pages = {1438 -- 1447}, language = {en} } @inproceedings{GeierPiesche, author = {Geier, Stephanie and Piesche, Manfred}, title = {Numerical simulation of polyurethane foaming processes on macro and micro scale}, series = {8th International Conference on Multiphase Flow, ICMF 2013, Jeju, Korea, 2013}, booktitle = {8th International Conference on Multiphase Flow, ICMF 2013, Jeju, Korea, 2013}, language = {en} } @inproceedings{GeierPiesche, author = {Geier, Stephanie and Piesche, Manfred}, title = {Numerische Simulation von Polyurethanschaum auf verschiedenen Gr{\"o}ßenskalen}, series = {23. Stuttgarter Kunststoffkolloquium, Stuttgart, 2013}, booktitle = {23. Stuttgarter Kunststoffkolloquium, Stuttgart, 2013}, language = {de} }