TY - JOUR A1 - Geier, Stephanie A1 - Piesche, Manfred T1 - Coupled Macro and Micro-scale Modeling of Polyurethane Foaming Processes JF - The Journal of Computational Multiphase Flows N2 - 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. Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-24838 UR - https://doi.org/10.1260/1757-482X.6.4.377 ER - TY - CHAP A1 - Geier, Stephanie A1 - Piesche, Manfred T1 - Macro and micro scale modeling of polyurethane foaming processes T2 - 29th International Conference of the Polymer Processing Society, PPS-29, Nürnberg, 2013 Y1 - 2013 UR - https://doi.org/10.1063/1.4873844 ER - TY - JOUR A1 - Geier, Stephanie A1 - Christian, Winkler A1 - Piesche, Manfred T1 - Numerical Simulation of Mold Filling Processes with Polyurethane Foams JF - Chemical Engineering Technology Y1 - 2009 UR - https://doi.org/10.1002/ceat.200900202 VL - 32 IS - 9 SP - 1438 EP - 1447 ER - TY - CHAP A1 - Geier, Stephanie A1 - Piesche, Manfred T1 - Numerical simulation of polyurethane foaming processes on macro and micro scale T2 - 8th International Conference on Multiphase Flow, ICMF 2013, Jeju, Korea, 2013 Y1 - 2013 ER - TY - CHAP A1 - Geier, Stephanie A1 - Piesche, Manfred T1 - Numerische Simulation von Polyurethanschaum auf verschiedenen Größenskalen T2 - 23. Stuttgarter Kunststoffkolloquium, Stuttgart, 2013 Y1 - 2013 ER -