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Simulation of spray coating in a spouted bed using recurrence CFD

Particuology 2019年第1期17卷 92-103页

作者： Paul Kieckhefena Thomas Lichtenegger Swantje Pietsch stefan pirker stefan Heinrich Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology. HamburgGermany Department for Particulate Flow Modelling. Johannes Kepler University LinzAustria Linz Institute of Technology (LIT) Johannes Kepler UniversityLinzAustria

Although numerical models such as the computational fluid dynamics–discrete element method (CFD–DEM) have enabled the accurate simulation of laboratory-scale apparatuses, the application of these methods to large-scale apparatuses with many particles and time scales ranging from minutes to hours remains a challenge. The recently developed recurrence CFD (rCFD) method seeks to overcome these issues in pseudo-periodic processes by extrapolating globally recurring patterns in a physically meaningful way and describing the transport and interaction of passive scalars using Lagrangian tracers. Spouted beds represent an interesting target because of the associated variety of flow regimes. They can be effectively described by CFD–DEM on the time scale of tens of seconds, whereas industrially relevant processes typically take hours. In this contribution, we established the validity of applying the Lagrangian rCFD method to spouted beds by demonstrating the accurate reproduction of the particle residence time distribution in a fictitious spray zone. The deposition of spray droplets onto tracer particles was simulated for 1 h, and the particle surface coverage distribution was estimated using a statistical approach for both an unstabilized prismatic spouted bed and one stabilized by draft plates.

关键词： CFD–DEM Recurrence CFD Spray coating Time-scale decoupling Spouted bed Draft plate

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Influence of rolling friction on single spout fluidized bed simulation

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Particuology 2012年第5期10卷 582-591页

作者： Christoph Goniva Christoph Kloss Niels G. Deen Johannes A.M.Kuipers stefan pirker Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinz Austria DCS Computing GmbH Linz Austria Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinz Austria Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhovenThe Netherlands Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhovenThe Netherlands Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinzAustria Institute of Fluid Mechanics and Heat Transfer Johannes Kepler UniversityLinzAustria

In this paper we study the effect of rolling friction on the dynamics in a single spout fluidized bed using Discrete Element Method （DEM） coupled to Computational Fluid Dynamics （CFD）. In a first step we neglect rolling friction and show that the results delivered by the open source CFD-DEM framework applied in this study agree with previous simulations documented in literature. In a second step we include a rolling friction sub-model in order to investigate the effect of particle non-sphericity. The influence of particle-particle as well as particle-wall rolling friction on the flow in single spout fluidized bed is studied separately. Adequate rolling friction model parameters are obtained using first principle DEM simulations and data from literature. Finally, we demonstrate the importance of correct modelling of rolling friction for coupled CFD-DEM simulations of spout fluidized beds. We show that simulation results can be improved significantly when applying a rolling friction model, and that experimental data from literature obtained with Positron Emission Particle Trackin~ fPEPT） technique can be satisfactorily reoroduced.

关键词： CFD-DEMOpen sourceRolling frictionSpout fluidized bedNon-sphericity

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RHI Refractories Opens Dalian Plant

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China's Refractories 2004年第4期13卷 26-27页

作者： stefan pirker Dr. Managing Director R&D RHI Refractories Technology Center RHI AG Magnesitstrasse 2 8700 Leoben Austria

Editor’sNote :Requestedbyourreaders ,acolumnofCompanyProfilehasopenedfromthisissueforthepurposeofprovidingthemwithmoreinformationonsomekeydomesticrefractoriesenterprises ,researchinstitutes ,jointventuresandforeignwhollyownedcompaniesinChinaterritory .ItisourgreatpleasuretostartthecolumnwithabriefintroductiontotheworldlargestrefractoriescompanyRHIontheoccasionoftheopenningceremonyofhersecondplantinChinaRHIRefractories(Dalian)Co .,Ltd .,whichwasheldonNovember30 ,2 0 0 4 .FollowingisthedetailontheeventcontributedbyDr .stefanpirker :

关键词： Supervisory Board Dalian City

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Parallel Open Source CFD-DEM for Resolved Particle-Fluid Interaction

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Journal of Energy and Power Engineering 2013年第9期7卷 1705-1712页

作者： Alice Hager Christoph Kloss stefan pirker Christoph Goniva Christian Doppler Laboratory on Particulate Flow Modelling Johannes Kepler University Linz 4040 Austria Altenbergerstrafle 69 DCS Computing GmbH Linz 4040 Austria Department on Particulate Flow Modelling Johannes Kepler University Linz 4040 Austria

A parallelized resolved method for the simulation of the dynamics of immersed bodies within fluids is presented. The algorithm uses a FDM (fictitious domain method) and combines the Lagrangian DEM (discrete element method) for tracking the bodies with a CFD (computational fluid dynamics) method for calculating the dynamics of the fluid phase. First the CFD-calculation is carried out, disregarding the solid bodies. Afterwards, the velocity information from the bodies is included and the force, the fluid imposes onto the bodies, is computed. The last step consists of a correction-operation which ensures the fulfillment of the conservation equation. Dynamic local mesh refinement is used for minimizing the number of fluid cells. The CFD-DEM coupling is realized within the Open Source framework CFDEMcoupling (www. cfdem. com), where the DEM software LIGGGHTS (www. liggghts. com) is linked against an OpenFOAM?-based CFD solver. While both LIGGGHTS and the CFD solver were already parallelized, only a recent improvement of the algorithm permits the fully parallel computation of resolved problems. This parallelization permits the treatment of large-scale problems. The enclosed validation and application examples show the dynamics of the flow around settling and rotating spheres as well as an investigation of the settling of spheres regarding the Boycott effect.

关键词：颗粒流体相互作用开源计算流体力学动力学仿真平行跟踪机构数字高程模型

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