Now showing items 1-8 of 8

    • A conceptual model of a shallow circulation induced by prescribed low-level radiative cooling 

      Naumann, Ann Kristin; Stevens, Bjorn; Hohenegger, Cathy; Mellado González, Juan Pedro (2017-10-01)
      Article
      Open Access
      A conceptual bulk model for a dry, convective boundary layer with prescribed horizontally homogeneous and heterogeneous low-level radiative cooling rates is developed. For horizontally homogeneous radiative cooling, the ...
    • Buoyancy reversal in cloud-top mixing layers 

      Mellado González, Juan Pedro; Stevens, Bjorn; Schmidt, Heiko; Peters, Norbert (2009-04-28)
      Article
      Open Access
      A theoretical and numerical small-scale study of the evaporative cooling phenomenon that might appear in the stratocumulus-topped boundary layers is presented. An ideal configuration of a cloud-top mixing layer is ...
    • Controlling entrainment in the smoke cloud using level set-based front tracking 

      Dietze, Eckhard; Schmidt, Heiko; Stevens, Bjorn; Mellado González, Juan Pedro (2015-01-13)
      Article
      Open Access
      Although large-eddy simulation (LES) has been shown to produce a reasonable representation of the turbulent circulations within the stratocumulus-topped boundary layer, it has difficulties to accurately predict ...
    • DNS and LES for simulating stratocumulus: Better together 

      Mellado González, Juan Pedro; Bretherton, Christopher; Stevens, Bjorn; Wyant, Matt (2018-07-05)
      Article
      Open Access
      We argue that combining direct numerical simulation (DNS) with large-eddy simulation (LES) and field studies could accelerate current lines of stratocumulus research. LES allows for a faster and more holistic study of ...
    • Probability density functions in the cloud-top mixing layer 

      Mellado González, Juan Pedro; Stevens, Bjorn; Schmidt, Heiko; Peters, Norbert (2010-08-19)
      Article
      Open Access
      The cloud-top mixing layer is an idealized configuration often employed in the literature to study local aspects (over length scales of the order of 10 m) of the top of stratocumulus-topped mixed layers. Latent heat effects ...
    • Study of low-order numerical effects in the two-dimensional cloud-top mixing layer 

      Dietze, Eckhard; Mellado González, Juan Pedro; Stevens, Bjorn; Schmidt, Heiko (2013-06-01)
      Article
      Open Access
      Large-eddy simulation (LES) has been extensively used as a tool to understand how various processes contribute to the dynamics of the stratocumulus layer. These studies are complicated by the fact that many processes are ...
    • Two-fluid formulation of the cloud-top mixing layer for direct numerical simulation 

      Mellado González, Juan Pedro; Stevens, Bjorn; Schmidt, Heiko; Peters, Norbert (2010-02-02)
      Article
      Open Access
      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 two fluid model is ...
    • Wind Shear and Buoyancy Reversal at the Top of Stratocumulus 

      Mellado González, Juan Pedro; Stevens, Bjorn; Schmidt, Heiko (2014-03-01)
      Article
      Open Access
      A numerical experiment is designed to study the interaction at the stratocumulus top between a mean vertical shear and the buoyancy reversal due to evaporative cooling, without radiative cooling. Direct numerical simulation ...