TY - GEN A1 - Klein, Marten A1 - Zenker, Christian A1 - Starick, Tommy A1 - Schmidt, Heiko T1 - Stochastic modeling of three-scalar mixing in a coaxial jet using one-dimensional turbulence T2 - 12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP12), Osaka, Japan (Online), July 19-22, 2022 N2 - Modeling complex mixing processes is a standing challenge for a number of applications ranging from chemical to mechanical and environmental engineering. Here, the gas-phase turbulent mixing in a three-stream concentric coaxial jet is investigated as a canonical problem. Reynolds-averaged Navier–Stokes simulations (RANS) suggest that the gas-phase mixing can be accurately modeled by air doped with passive scalars, for which small-scale resolving numerical simulations are performed with the one-dimensional turbulence (ODT) model as stand-alone tool. We show that both the spatial (S-ODT) and temporal (T-ODT) model formulations yield qualitatively similar results exhibiting reasonable to good agreement with available reference experiments, Reynolds-averaged and large-eddy simulations, as well as mixing models. This is demonstrated for low-order statistics, like the scalar variance and dissipation, but also the two-scalar joint probability density functions that can not be obtained with RANS. Our results suggest that S-ODT has better capabilities than T-ODT to model the mixing processes in the jet which we attribute to the account of local advective time scales. KW - stochastic modeling KW - one-dimensional turbulence KW - concentric coaxial round jet KW - multiple passive scalars KW - turbulent mixing KW - co-flow entrainment Y1 - 2022 UR - http://www.tsfp-conference.org/proceedings/2022/208.pdf UR - http://www.tsfp-conference.org/proceedings/proceedings-of-tsfp-12-2022-osaka.html N1 - Contribution No. 6 of 7 in Session 13C: Jets II SP - 1 EP - 6 ER - TY - GEN A1 - Schmidt, Kersten A1 - Diaz, Julien A1 - Heier, Christian T1 - Non-conforming Galerkin finite element methods for local absorbing boundary conditions of higher order T2 - Computers & Mathematics with Applications N2 - A new non-conforming finite element discretization methodology for second order elliptic partial differential equations involving higher order local absorbing boundary conditions in 2D and 3D is proposed. The novelty of the approach lies in the application of C⁰-continuous finite element spaces, which is the standard discretization of second order operators, to the discretization of boundary differential operators of order four and higher. For each of these boundary operators, additional terms appear on the bound-ary nodes in 2D and on the boundary edges in 3D, similarly to interior penalty discontinuous Galerkin methods, which leads to a stable and consistent formulation. In this way, no auxiliary variables on the boundary have to be introduced and trial and test functions of higher smoothness along the boundary are not required. As a consequence, the method leads to lower computational costs for discretizations with higher order elements and is easily integrated in high-order finite element libraries. A priori h-conver-gence error estimates show that the method does not reduce the order of convergence compared to usual Dirichlet, Neumann or Robin boundary conditions if the polynomial degree on the boundary is increased simultaneously. A series of numerical experiments illustrates the utility of the method and validates the theoretical convergence results. KW - Interior Penalty Galerkin finite element methods KW - Local absorbing boundary conditions Y1 - 2015 U6 - https://doi.org/10.1016/j.camwa.2015.08.034 SN - 0898-1221 VL - 70 IS - 9 SP - 2252 EP - 2269 ER - TY - GEN A1 - Schmidt, Thomas A1 - Ahrens, Christian A1 - Flege, Jan Ingo A1 - Jaye, Cherno A1 - Fischer, Daniel A. A1 - Falta, Jens T1 - Growth of Epitaxial 3,4,9,10-Perylene Tetracarboxylic Dianhydride on Bi-Terminated Silicon T2 - Journal of Physical Chemistry C N2 - The epitaxial quality of thin films crucially depends on their interaction with the substrate. Up to now, Ag-terminated Si(111) has been employed as the model substrate for the growth of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on semiconductors. In this study, we will show that Bi termination results in PTCDA films of superior epitaxial quality. We have studied the growth of PTCDA on bismuth-passivated Si(111) in detail by means of spot profile analysis of low-energy electron diffraction (SPA-LEED), X-ray photoemission spectroscopy (XPS), near-edge X-ray absorptionfine structure (NEXAFS), and scanning tunneling microscopy (STM). The XPS results reveal the presence of intact PTCDA molecules on the surface upon adsorption. NEXAFS data indicate the PTCDA molecules being oriented with their molecular plane parallel to the surface. STM shows a very smooth growth front of the PTCDA film, preserving the step structure of the substrate. High-resolution SPA-LEED data demonstrate the presence of a multidomain surface with a rich variety of PTCDA surface structures, which were identified to be most prominently herring-bone polytypes. However, in the monolayer range, quadratic brick-wall structures and a nearly square-like structure as well as a perylene-like structure have also been found. Despite the simultaneous presence of multiple domains, the individual domains show excellent lateral ordering, with larger domain sizes as compared to the case of Ag-terminated Si(111). KW - dianhydride KW - Bi-terminated silicon KW - spot profile analysis of low-energy electron diffraction (SPA-LEED) KW - X-ray photoemission spectroscopy (XPS) KW - near-edge X-ray absorptionfine structure (NEXAFS) KW - scanning tunneling microscopy (STM) Y1 - 2019 U6 - https://doi.org/10.1021/acs.jpcc.8b10396 SN - 1932-7447 SN - 1932-7455 VL - 123 IS - 12 SP - 7097 EP - 7109 ER - TY - GEN A1 - Medina Méndez, Juan Ali A1 - Bacher, Christian A1 - Riebel, Ulrich A1 - Schmidt, Heiko T1 - Electrohydrodynamically-enhanced drag in a vertical pipe-flow with a concentric electrode: A One-Dimensional Turbulence study T2 - European Journal of Mechanics. B,Fluids Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S0997754622000814 U6 - https://doi.org/10.1016/j.euromechflu.2022.05.008 SN - 1873-7390 SN - 0997-7546 VL - 95 SP - 240 EP - 251 ER - TY - GEN A1 - Medina Méndez, Juan Ali A1 - Schmidt, Heiko A1 - Bacher, Christian A1 - Riebel, Ulrich T1 - Electrohydrodynamic‐enhanced internal pipe flows from a One‐Dimensional Turbulence perspective T2 - 91st Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) Y1 - 2020 U6 - https://doi.org/10.1002/pamm.202000132 VL - 20 IS - 1 PB - Wiley ER - TY - CHAP A1 - Stollberg, Christian A1 - Schmidt, M. A1 - Namango, Saul A1 - Pohl, R. A1 - Ay, Peter T1 - Conditioning, Identification and Automatic Sorting of Plastic Automotive Parts for Productive Recycling T2 - International Automobile Recycling Congress, IARC 2002, Geneva, Switzerland, March 13 - 15, 2002, proceedings KW - automobile recycling Y1 - 2002 PB - ICM AG CY - Muri ER - TY - GEN A1 - Busse, Ralph-Peter A1 - Fischer, Gert A1 - Gebauer, Gert A1 - Höfler, Frank A1 - Junker, Sabine A1 - Kramer, Thomas A1 - Opperskalski, Stephan A1 - Potthoff, Ulrich A1 - Remus, Ricardo A1 - Schlamkow, Christian A1 - Schmidt, Wolfgang A1 - Scobel, Ekkehard A1 - Stopp, Horst A1 - Strangfeld, Peter A1 - Trang, Ngyen Thi Thu A1 - Völker, Eduard A1 - Vukorep, Ilija A1 - Weidhase, Frieder A1 - Winzer, Reinhard ED - Stopp, Horst ED - Strangfeld, Peter T1 - Floating Architecture - Construction on and near water T1 - Schwimmende Architektur – Bauen am und auf dem Wasser N2 - The publishers are receiving more and more inquiries about the topic “Floating Architecture”, particularly about technical details, water chemistry, as well as ice and wave problems. Since there is a lack of technical literature on this topic, most students working on projects or theses related to this topic send their inquiries. A time of general and quick changes results in a large number of daily publications. Therefore it is difficult to understand why there is a lack of lit-erature about floating structures. One has to consider that sea levels will continue to rise and consequently a larger number of people will have to live on the surface of the sea. Obviously, some expert knowledge is required which needs a longer period of time to be gained through scientific advancements and experience. The publishers, who have been dealing with the topic of floating houses for some years, are grateful to the authors for their agreement to allow the publication of their papers on floating architecture. These papers were mainly prepared for two conferences on floating architecture held in the study centre of the IBA building, Großräschen. Therefore, the reader should know that, along with the usual papers, only a selection of self-explaining transparencies is shown in order to meet the printing requirements. The included list of both the authors and their addresses makes it easy for interested people to send any inquiries to them. A short introduction as well as an outlook at the end of each paper is meant to draw attention to current events in order to be able to promptly identify opportunities and risks connected with living on the water. KW - Floating architecture KW - Floating buildings Y1 - 2017 SN - 978-3-643-90910-7 PB - LIT-Verlag CY - Berlin ER - TY - CHAP A1 - Schmidt, Sindy A1 - Heise, Philipp A1 - Schulz, Christian T1 - Entwicklung eines Steuerungs- und Regelungsprogrammes für einen Prüfstand zur Prüfung von Feuerwehrpumpen T2 - Institut für Umwelttechnik und Recycling Senftenberg e.V. : Resümee und ausgewählte Projekte 2012-2017 : 20 Jahre IURS e.V. N2 - Kurzdokumentation über die Programmierung einer Software, für die Anwendung automatischer Prüfroutinen, zur Prüfung von Feuerwehrpumpen, Armaturen und Saugschläuchen, unter Verwendung von LabVIEW als grafische Programmieroberfläche. N2 - Short documentation on software programming, to use automatic test routines, for testing of fire pumps, fittings and suction hoses, using LabVIEW as graphical programming interface. KW - Prüfstand KW - LabVIEW Y1 - 2017 SN - 978-3-00-058468-8 SN - 978-3-00-058469-5 SP - 86 EP - 89 PB - IURS e.V. CY - Senftenberg ET - 1. Auflage ER - TY - GEN A1 - Schmidt, Carsten A1 - Rödiger, Stefan A1 - Gruner, Melanie A1 - Moncsek, Anja A1 - Stohwasser, Ralf A1 - Hanack, Katja A1 - Schierack, Peter A1 - Schröder, Christian T1 - Multiplex localization of sequential peptide epitopes by use of a planar microbead chip T2 - Analytica Chimica Acta Y1 - 2016 U6 - https://doi.org/10.1016/j.aca.2015.12.030 SN - 0003-2670 VL - 908 SP - 150 EP - 160 ER - TY - CHAP A1 - Bärwolff, Manuela A1 - Böhm, Christian A1 - Schmidt, C. A1 - Schwarz, K.- U. A1 - Vetter, A. T1 - Combining short rotation coppice with annual crops - modern agroforestry systems for sustainable land use T2 - Proceedings of the 19th European Biomass Conference and Exhibition: From Research to Industry and Markets, 6-9 Juni 2011 in Berlin, Deutschland Y1 - 2011 SN - 978-88-89407-55-4 U6 - https://doi.org/10.5071/19thEUBCE2011-OB1.5 SP - 55 EP - 60 ER -