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Item type:Publication, Access status: with files , Multi-domain design structure matrix approach applied to urban system modeling(Multidisciplinary Digital Publishing Institute (MDPI), 2020-06-21); ; ; ; Modeling the urban system for urban health and well-being with the aim of finding ways to optimize the well-being of urban dwellers is a complex task. Different modeling approaches that consider specific parts of the urban system, e.g., environmental stressors, urban society, and urban morphology, need to be integrated. The conceptual model of health-related urban well-being (UrbWellth) has been constructed to provide a structure for an integrated modeling framework. However, interfaces between the different modeling approaches were not sufficiently identified until now. The challenge to specify and operationalize these interfaces is met by using the Design Structure Matrix (DSM) concept, which is widely used in design engineering. It is used here to identify necessary interfaces within the urban system by determining the relevant interface variables and processes. The conceptual model for UrbWellth is used to construct a DSM. The results of a clustering of this UrbWellth-based DSM reveal that the structure of the conceptual model is indeed suitable to serve as a basis for an integrated model. Further, a Multi-Domain DSM (MDDSM), which is an extension of the DSM based on expert knowledge from individual modelers, identified the interface variables for the integrated model components as well as the processes for which different modeling approaches need to be coordinated. Moreover, the approach based on MDDSM identified processes that are not yet covered by the available modeling approaches.Publicationtype: Journal Article473 319 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Modeling, simulation and optimization of general solar updraft towersA model to describe a solar chimney power plant with a generally sloped collector field and for the general situation of humid air is presented. This is a significant development of existing simple models for solar updraft towers with planar collector fields for the sit- uation of purely dry air. The model describing the gas dynamics in the collector and in the chimney includes a turbine model, friction and heat transfer losses, evaporation and condensation models etc. However, the relevant physics can be modeled in one space di- mension. It is the result of a fully compressible gas dynamic model in the small Mach number limit. A numerical algorithm is defined which admits very fast simulations. There- fore optimization procedures can easily be applied. Numerical results on optimization with respect to geometric and physical parameters which may be considered both in the plan- ning and the operational phase are presented. The results are compared qualitatively and –if available –quantitatively to prototype data and to simulations from the literature.Publicationtype: Journal ArticleScopus© Citations 6 264 444 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , On one-dimensional Low Mach number applicationsWe consider Low Mach number gas dynamic flows with significant energy transport. In addition we focus on applications where a one-dimensional description is appropriate. For such flows we discuss various asymptotic regimes in the vanishing Mach number limit. In the first example we study the flow in a chimney. In the second example we investigate the gas dynamics in a so-called Energy Tower, a power plant designed for producing electrical energy using the latent heat of water.Publicationtype: Conference Paper60