TY - GEN A1 - Mellado, Juan Pedro A1 - Stevens, Bjorn A1 - Schmidt, Heiko A1 - Peters, Norbert T1 - Probability density functions in the cloud-top mixing layer Y1 - 2010 UR - http://iopscience.iop.org/1367-2630/12/8/085010/pdf/1367-2630_12_8_085010.pdf ER - TY - GEN A1 - Mellado, Juan Pedro A1 - Stevens, Bjorn A1 - Schmidt, Heiko A1 - Peters, Norbert T1 - Two-fluid formulation of the cloud-top mixing layer for direct numerical simulation T2 - Theoretical and computational fluid dynamics N2 - A mixture fraction formulation to perform direct numerical simulations of a disperse and dilute two-phase system consisting of water liquid and vapor in air in local thermodynamic equilibrium using a twofluid model is derived and discussed. The goal is to understand the assumptions intrinsic to this simplified but commonly employed approach for the study of two-layer buoyancy reversing systems like the cloud-top mixing layer. Emphasis is placed on molecular transport phenomena. In particular, a formulation is proposed that recovers the actual nondiffusive liquid-phase continuum as a limiting case of differential diffusion. High-order numerical schemes suitable for direct numerical simulations in the compressible and Boussinesq limits are described, and simulations are presented to validate the incompressible approach. As expected, the Boussinesq approximation provides an accurate and efficient description of the flow on the scales (of the order of meters) that are considered. KW - Free convection KW - Free turbulent flows KW - Multiphase KW - Stratocumulus clouds Y1 - 2010 U6 - https://doi.org/10.1007/s00162-010-0182-x SN - 1432-2250 SN - 0935-4964 VL - 24 IS - 6 SP - 511 EP - 536 ER - TY - GEN A1 - Mellado, Juan Pedro A1 - Stevens, Bjorn A1 - Schmidt, Heiko A1 - Peters, Norbert T1 - Buoyancy reversal in cloud-top mixing layers T2 - Quarterly Journal of the Royal Meteorological Society Y1 - 2009 U6 - https://doi.org/10.1002/qj.417 SN - 1477-870X VL - 135 IS - 641 SP - 963 EP - 978 ER - TY - GEN A1 - Mauß, Fabian A1 - Keller, D. A1 - Peters, Norbert T1 - A Lagrangian Simulation of Flamelet Extinction and Re-Ignition in Turbulent Jet Diffusion Flames T2 - Symposium (International) on Combustion Y1 - 1990 SN - 0082-0784 VL - 23 IS - 1 SP - 693 EP - 698 ER - TY - GEN A1 - Mauß, Fabian A1 - Seshadri, K. A1 - Peters, Norbert A1 - Warnatz, J. T1 - A Flamelet Calculation of Benzene Formation in Coflowing Laminar Diffusion Flames T2 - Symposium (International) on Combustion Y1 - 1990 SN - 0082-0784 VL - 23 IS - 1 SP - 559 EP - 566 ER - TY - GEN A1 - Mauß, Fabian A1 - Göttgens, J. A1 - Peters, Norbert T1 - Analytic Approximation of Burning Velocities and Flame Thickness of Lean Hydrogen, Methane, Ethylene, Acetylene and Propane Flames T2 - Symposium (International) on Combustion Y1 - 1992 SN - 0082-0784 VL - 24 IS - 1 SP - 129 EP - 135 ER - TY - GEN A1 - Breitbach, H. A1 - Göttgens, J. A1 - Mauß, Fabian A1 - Pitsch, H. A1 - Peters, Norbert T1 - Laminar Counterflow Mixing of Acetylene into Hot Combustion Products T2 - Symposium (International) on Combustion Y1 - 1994 SN - 0082-0784 VL - 25 IS - 1 SP - 1357 EP - 1364 ER -