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    Item type:Publication, Access status: without files ,
    A 3D smoothed particle hydrodynamics model for erosional dam-break floods
    (Taylor & Francis, 2017-11-26)
    Amicarelli, Andrea
    ;
    Kocak, Bozhana
    ;
    Sibilla, Stefano
    ;
    Grabe, Jürgen
    A mesh-less smoothed particle hydrodynamics (SPH) model for bed-load transport on erosional dam-break floods is presented. This mixture model describes both the liquid phase and the solid granular material. The model is validated on the results from several experiments on erosional dam breaks. A comparison between the present model and a 2-phase SPH model for geotechnical applications (Gadget Soil; TUHH) is performed. A demonstrative 3D erosional dam break on complex topography is investigated. The present 3D mixture model is characterised by: no tuning parameter for the mixture viscosity; consistency with the Kinetic Theory of Granular Flow; ability to reproduce the evolution of the free surface and the bed-load transport layer; applicability to practical problems in civil engineering. The numerical developments of this study are represented by a new SPH scheme for bed-load transport, which is implemented in the SPH code SPHERA v.8.0 (RSE SpA), distributed as FOSS on GitHub.
    Publicationtype: Journal Article
      146
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    Item type:Publication, Access status: without files ,
    A critical analysis of turbulent natural and forced convection in a plane channel based on direct numerical simulation
    (Taylor & Francis, 2011-10-14)
    Kiš, Petar
    ;
    Herwig, Heinz
    The balance equations for mixed convection in plane channel flow, based on the Boussinesq assumption for buoyancy, are carefully analysed by considering the two limits of pure forced and natural convection. Additional information about the flow is gained from the mechanical energy equation and the entropy equation (the second law of thermodynamics). Since the Boussinesq approximation assumes ε = δT*/T* → 0, i.e. a vanishing dimensionless temperature difference between the hot and the cold wall, certain inconsistencies in modelling the flow appear for ε ≠ 0. They are identified and discussed with respect to their importance. Numerical solutions gained by a direct numerical simulation (DNS) approach give detailed information about the friction factors and Nusselt numbers including the influence of those terms in the equations that turn out to be the source of the inconsistency in the modelling for ε ≠ 0. © 2011 Taylor and Francis Group, LLC.
    Publicationtype: Journal Article
      13