TY - GEN A1 - Schmidt, Heiko A1 - Kerstein, Alan R. A1 - Nédélec, Renaud A1 - Wunsch, Scott A1 - Sayler, Ben J. T1 - Analysis and numerical simulation of a laboratory analog of radiatively induced cloud-top entrainment T2 - Theoretical Computational Fluid Dynamics Y1 - 2012 U6 - https://doi.org/10.1007/s00162-012-0288-4 SN - 1432-2250 ER - TY - CHAP A1 - Schmidt, Heiko A1 - Klein, Rupert ED - Warnecke, Gerald T1 - Flexible flame structure modelling in a Flame Front Tracking Scheme T2 - Analysis and Numerics for Conservation Laws Y1 - 2005 SN - 978-3-540-24834-7 SP - 405 EP - 427 PB - Springer CY - Heidelberg ER - TY - GEN A1 - Schmidt, Heiko A1 - Klein, Rupert T1 - A generalized level-set/in-cell-reconstruction approach for accelerating turbulent premixed flames T2 - Combustion Theory and Modelling N2 - An extended numerical technique for the simulation of accelerating turbulent premixed flames in large scale geometries is presented. It is based on a hybrid capturing tracking technique. It resembles a tracking scheme in that the front geometry is explicitly computed using a level-set method. The basic flow properties are provided by solving the compressible flow equations. The flame-flow-coupling is achieved by an in-cell-reconstruction technique. In cells cut by the flame, the discontinuous solution is reconstructed from given cell averages by invoking explicitly some Rankine-Hugoniot type jump conditions. Then the reconstructed states and again the front geometry are used to define accurate effective numerical fluxes across grid cell interfaces intersected by the front during the time step considered. Hence, the scheme also resembles a capturing scheme in that only cell averages of conserved quantities are computed. To be able to model inherently unsteady effects, like quenching, reignition, etc, during flame acceleration, we modified the standard Rankine-Hugoniot jump conditions. A source term appearing in the& modified jump conditions is computed by evaluating a suitable functional on the basis of a one-dimensional flame structure module, that is attached in the normal direction to the flame front. This module additionally yields quantities such as the net mass burning rate, necessary for the propagation of the level set, and the specific heat release important for the energy release due to the consumption of fuel. Generally, the flame structure calculation takes into account internal physical effects which are not active in the outer flow but essential for the front motion and its feedback on the surrounding fluid. If a suitable set of different (turbulent) combustion models to compute the flame structure is provided, the new numerical technique allows us to consistently represent laminar deflagrations, fast turbulent deflagrations as well as detonation waves. Supplemented with suitable criteria that capture the essence of a deflagration-to-detonation-transition (DDT), the complete evolution of such an event can be implemented in principle. Y1 - 2003 U6 - https://doi.org/10.1088/1364-7830/7/2/303 SN - 1364-7830 VL - 7 IS - 2 SP - 243 EP - 267 ER - TY - GEN A1 - Oevermann, Michael A1 - Schmidt, Heiko A1 - Kerstein, Alan R. T1 - HCCI combustion modeling using detailed chemistry coupled to LEM-based advection T2 - Combustion and Flame Y1 - 2008 SN - 1556-2921 VL - 155 IS - 3 SP - 370 EP - 379 ER - TY - GEN A1 - Schulz, Falko T. A1 - Glawe, Christoph A1 - Schmidt, Heiko A1 - Kerstein, Alan R. T1 - Toward modeling of CO2 multi-phase flow patterns using a stochastic multi-scale approach T2 - Environmental Earth Sciences Y1 - 2013 U6 - https://doi.org/10.1007/s12665-013-2461-5 SN - 1866-6299 VL - 70 IS - 8 SP - 3739 EP - 3748 ER - TY - CHAP A1 - Schulz, Falko T. A1 - Glawe, Christoph A1 - Schmidt, Heiko A1 - Kerstein, Alan R. T1 - Liquid jet simulation using one-dimensional turbulence T2 - 14th European Turbulence Conference, Lyon, France, September 1-4, 2013 Y1 - 2013 UR - http://etc14.ens-lyon.fr/etc-14-proceedings/accepted-talks/ ER - TY - CHAP A1 - Schulz, Falko T. A1 - Glawe, Christoph A1 - Kerstein, Alan R. A1 - Schmidt, Heiko T1 - Toward modeling of supercritical CO2 flow using map-based advection T2 - EGU General Assembly 2012, held 22-27 April, 2012 in Vienna Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-8816-1.pdf N1 - EGU2012-8816-1 ER - TY - CHAP A1 - Schmidt, Heiko A1 - Jozefik, Zoltan A1 - Jimenez, Carmen T1 - Detailed numerical simulation of forced planar premixed flames T2 - Book of abstracts, 34th International Symposium on Combustion, July 29 - August 3, Warsaw, Poland Y1 - 2012 UR - http://www.combustion2012.itc.pw.edu.pl/files/wip%20posters.pdf UR - http://www.combustion2012.itc.pw.edu.pl/files/W2P097-101.pdf N1 - W2P097 PB - The Combustion Institute, University of Technology CY - Warsaw ER - TY - CHAP A1 - Schmidt, Heiko A1 - Kerstein, Alan R. T1 - Modeling of wind-field fluctuations using the one-dimensional-turbulence model T2 - The Science of Making Torque from Wind, Oldenburg, Germany, October 9-11, 2012 Oldenburg Germany Y1 - 2012 UR - https://www-docs.b-tu.de/fg-stroemungsmodellierung/public/2012_Forwind_Oldenburg.pdf ER - TY - CHAP A1 - Mellado, Juan Pedro A1 - Stevens, Bjorn A1 - Schmidt, Heiko A1 - Peters, Norbert T1 - The evaporatively driven cloud-top mixing layer T2 - 63rd Annual Meeting of the APS Division of Fluid Dynamics Y1 - 2010 UR - http://meetings.aps.org/Meeting/DFD10/Event/133816 ER -