TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Lattner, Yannick A1 - Geller, Marius A1 - Kluck, Norbert T1 - Efficiency Approximation of Centrifugal Compressors in the Cordier Diagram N2 - We present a simulation data-based efficiency approximation for radial turbocompressors, which is implemented in the well-known Cordier diagram. A sophisticated CAE workflow is used to calculate the operational characteristics of 50 machine designs with 50 impeller geometry variations each. A Kriging-based surrogate model is trained to approximate the efficiency of any machine designs' best geometry design. The models are implemented into a machine design workflow. As a result, duty-specific Cordier lines are introduced. They are automatically generated for a set of machine design parameters. The efficiency of the designs along the duty-specific Cordier lines is approximated. Using optimization techniques, an optimal compressor design for the given duty on every specific Cordier line may be identified. This highly increases the amount of information available in the early design stages for radial turbocompressors. KW - CENTRIFUGAL COMPRESSOR, CORDIER DIAGRAM, CFD, METAMODELING, DESIGN OF EXPERIMENTS Y1 - 2023 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33661 U6 - https://doi.org/10.26205/opus-3366 DO - https://doi.org/10.26205/opus-3366 SP - 12 S1 - 12 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Lattner, Yannick A1 - Geller, Marius T1 - Radial Turbocompressor Chord Length Approximation for the Reynold's Number Calculation N2 - We present an approximation model for the chord length of radial turbocompressors. The model enables the calculation of a compressor's chord Reynold's number during the machine design process. The chord Reynold's number is shown to be the most accurate representation of the fluid dynamic properties inside the radial turbocompressor's impeller. It — however — requires the computation of the chord length, which is only available after defining the final impeller geometry. The method presenting in this paper only employs the compressors principal dimensions to approximate the chord length. The chord is modelled using a Bézier spline and quarter ellipse. This enables the earlier use of the chord Reynold's number during the machine design process of radial turbocompressors. KW - Strömungsmaschine , Reynolds-Zahl KW - Radial turbocompressors KW - Reynold's number KW - Turbomachinery KW - Design methods Y1 - 2023 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33351 U6 - https://doi.org/10.26205/opus-3335 DO - https://doi.org/10.26205/opus-3335 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Kremer, Robert A1 - Khani, Somayeh A1 - Appel, Tamara A1 - Palkowski, Heinz A1 - Foadian, Farzad T1 - Selective laser melting of CuSn10: simulation of mechanical properties, microstructure, and residual stresses JF - Materials Y1 - 2022 SN - 1996-1944 SS - 1996-1944 VL - 15 (2022) IS - 11 SP - 1 EP - 13 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Guias, Flavius T1 - On efficacy and effectiveness of vaccines BT - a mathematical approach based on conditional probability with applications to the COVID-19 context JF - Spora : a journal of biomathematics Y1 - 2022 SN - 2473-5493 SS - 2473-5493 VL - 8 (2022) SP - 56 EP - 60 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Guias, Flavius T1 - Effects of the reproduction number in a SEIIRD model describing the time evolution of COVID-19 at country level JF - WSEAS Transactions on Computer Research Y1 - 2020 SN - 1991-8755 SS - 1991-8755 VL - 19 (2020) SP - 292 EP - 297 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Guias, Flavius T1 - Numerical simulation of a modified SIR model fitting statistical data for COVID-19 JF - WSEAS Transactions on Computer Research Y1 - 2020 SN - 1991-8755 SS - 1991-8755 VL - 8 (2020) SP - 115 EP - 125 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Bongert, Markus A1 - Wüst, Jan A1 - Strauch, Justus A1 - Buchwald, Dirk T1 - Proof of concept for ozone-based disinfection of heater cooler units JF - Current directions in biomedical engineering Y1 - 2020 SN - 2364-5504 SS - 2364-5504 VL - 6 (2020) IS - 3 ER - TY - CHAP U1 - Buchbeitrag A1 - Schemmann, Christoph A1 - Geller, Marius A1 - Kluck, Norbert T1 - Identification of loss model parameters for highly loaded centrifugal impellers T2 - Proceedings : 15th International Probabilistic Workshop & 10th Dresdner Probabilistic Workshop, 27th-29th September 2017, Dresden, Germany Y1 - 2017 PB - TUDpress CY - Dresden ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Guias, Flavius T1 - Numerical solvers for large systems of ordinary differential equations based on the stochastic direct simulation method improved by the Picard and Runge-Kutta principles JF - International Journal of Mathematics and Computers in Simulation Y1 - 2017 SN - 1998-0159 SS - 1998-0159 VL - 11 (2017) SP - 93 EP - 99 ER - TY - CHAP U1 - Buchbeitrag A1 - Guias, Flavius T1 - Stochastic Picard-Runge-Kutta solvers for large systems of autonomous ordinary differential equations T2 - 2017 fourth International Conference on Mathematics and Computers in Science and Industry - MCSI 2017 : Corfu, Greece, 24-27 August 2017 : proceedings Y1 - 2017 SP - 289 EP - 302 PB - IEEE CY - Piscataway, NJ ER -