U
Ulrich Schumann
Researcher at German Aerospace Center
Publications - 308
Citations - 17778
Ulrich Schumann is an academic researcher from German Aerospace Center. The author has contributed to research in topics: Cirrus & Turbulence. The author has an hindex of 69, co-authored 299 publications receiving 16483 citations.
Papers
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Subgrid Scale Model for Finite Difference Simulations of Turbulent Flows in Plane Channels and Annuli
TL;DR: In this paper, the finite difference procedure and the subgrid scale (SGS) motion model are used to simulate high Reynolds number turbulent flows of incompressible fluids in plane channels and annuli, and the boundary conditions are formulated in a manner consistent with the SGS theory.
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Coherent structure of the convective boundary layer derived from large-eddy simulations
Helmut Schmidt,Ulrich Schumann +1 more
TL;DR: In this paper, the authors used large-eddy simulations (LES) for zero mean horizontal flow in the convective boundary layer (CBL) of a Boussinesq fluid, and found that the results in terms of vertical mean profiles of turbulence statistics generally agree very well with results available from laboratory and atmospheric field experiments.
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Transport impacts on atmosphere and climate: Aviation
David S. Lee,Giovanni Pitari,Volker Grewe,Klaus Gierens,Joyce E. Penner,Andreas Petzold,Michael J. Prather,Ulrich Schumann,Alkiviadis F. Bais,Terje Koren Berntsen,D. Iachetti,Ling L. Lim,Robert Sausen +12 more
TL;DR: A comprehensive updated assessment of aviation is provided, highlighting the impact of aviation emissions of CO2 on global mean surface temperature last for many hundreds of years (in common with other sources), whilst its non-CO2 effects onTemperature last for decades.
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The global lightning-induced nitrogen oxides source
Ulrich Schumann,Heidi Huntrieser +1 more
TL;DR: The best estimate of the annual global LNOx nitrogen oxides nitrogen mass source and its uncertainty range is (5±3) Tg a−1 in this paper, implying larger flash-specific NOx emissions.
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Realizability of Reynolds-Stress Turbulence Models
TL;DR: In this article, it was shown that existing phenomenological models of turbulence in terms of differential equations for the Reynolds stresses do not guarantee realizable solutions, and some means are proposed which can be used to change the existing models into realizable ones.