Title: Sandgrain roughness model for rough walls within Eulerian-Lagrangian predictions of turbulent flows
Authors: Breuer, Michael  
Alletto, Michael 
Langfeldt, Felix
Language: en_US
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: 2012
Publisher: Pergamon Press
Document Type: Article
Source: Enthalten in: International journal of multiphase flow. - Oxford : Pergamon Press, 1973- ; ZDB-ID: 186752-0 . - Bd. 43.2012, 1, Seite 157-175
Journal / Series / Working Paper (HSU): International Journal of Multiphase Flow 
Volume: 43
Issue: 1
Page Start: 157
Page End: 175
Publisher Place: Oxford
Wall roughness is known to have a significant influence on particle-laden wall-bounded flows directly affecting the particulate and the continuous phase. For sufficiently high mass loading the fluid flow is also indirectly altered by the particles subjected to collisions with rough walls. The paper is concerned with the question how the effect of rough walls on the particulate phase can be modeled taking a minimum of measured or empirically determined physical quantities into account. Following Nikuradse's idea, a sandgrain roughness model is proposed for the dispersed phase in which the wall is covered by a densely packed layer of sand grains idealized by mono-disperse spheres. Based on geometric considerations relying on generally used roughness parameters such as R z or R q the local inclination of the wall is determined in order to predict the inelastic collision of the particles with the wall including friction. The sandgrain model also takes the shadow effect into account leading to asymmetric probability density functions of the wall inclination angles, where the mean normal vector is turned towards the incoming particle trajectory. The wall model applicable in 3-D is evaluated in the context of four-way coupled large-eddy simulations for turbulent plane channel flow but is also applicable in direct numerical simulations or Reynolds-averaged Navier-Stokes predictions. A variety of test scenarios were considered including varying wall roughness values, several mass loadings and different particle sizes. © 2012 Elsevier Ltd.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://api.elsevier.com/content/abstract/scopus_id/84860534729
ISSN: 03019322
DOI: 10.1016/j.ijmultiphaseflow.2012.03.002
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