John Paul Morrissey

John Paul Morrissey
The University of Edinburgh | UoE · School of Engineering

Ph.D.
Research Fellow at the University of Edinburgh working on all things granular.

About

28
Publications
8,583
Reads
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331
Citations
Additional affiliations
July 2013 - August 2022
The University of Edinburgh
Position
  • Research Fellow
Description
  • Research Fellow in the field of granular mechanics. Interested in cohesive materials, bulk handling and processing. Expertise in DEM simulations and related data analysis.
October 2009 - May 2014
The University of Edinburgh
Position
  • Tutor & Demonstrator
Description
  • Tutor & Demonstrator in a number of course including soli mechanics, geotechnical engineering and computational geomechanics.
Education
October 2009 - May 2013
The University of Edinburgh
Field of study
  • Engineering
September 2006 - May 2009
The University of Edinburgh
Field of study
  • Civil Engineering
September 2002 - May 2005
Cork Institute of Technology
Field of study
  • Civil Engineering

Publications

Publications (28)
Article
An adhesive elasto-plastic contact model for the discrete element method with three dimensional non-spherical particles is proposed and investigated to achieve quantitative prediction of cohesive powder flowability. Simulations have been performed for uniaxial consolidation followed by unconfined compression to failure using this model. The model h...
Article
The overall aim of this project was to relate ground penetrating radar (GPR) to a ballast fouling index (FI). Laboratory research aimed at characterising the electromagnetic properties has enabled researchers worldwide to determine ballast thickness using impulse ground penetrating radar (GPR) – based upon derived values of the relative electrical...
Thesis
Full-text available
Across industry the majority of raw materials handled are particulate in nature, ranging in size and properties from aggregates to powders. The stress regimes experienced by the granular solids vary and the exhibited bulk behaviours can be complex and unexpected. The prevalence of granular solids makes them an area of interest for industry and rese...
Article
Full-text available
Regardless of its origin, in the near future the challenge will not be how to generate data, but rather how to manage big and highly distributed data to make it more easily handled and more accessible by users on their personal devices. VELaSSCo (Visualization for Extremely Large-Scale Scientific Computing) is a platform developed to provide new vi...
Article
This paper presents a generic framework of Model Driven Design (MDD) with its application for a twin screw granulation process using a mechanistic-based population balance model (PBM). The process kernels including nucleation, breakage, layering and consolidation are defined in the PBM. A recently developed breakage kernel is used with key physics...
Article
Full-text available
Attrition and breakage of agglomerates are prevalent during production and handling processes in many industries. Therefore, it is highly desirable to be able to model and analyse the agglomerate breakage process under various loading conditions. The ensemble strength and breakage patterns of agglomerates are still not well understood despite a sig...
Article
Full-text available
Bonded contact models have been increasingly used in the discrete element method (DEM) to study cemented and sintered particulate materials in recent years. Several popular DEM bond models have been proposed in the literature; thus it is beneficial to assess the similarities and differences between the different bond models before they are used in...
Article
With increasing train speed and wheel axle load, severe vibrations can occur in a ballasted trackbed, thereby accelerating the degradation of the ballast particles and ultimately causing excessive settlement. To gain insights into the long-term trackbed behavior and the ballast degradation evolution, a full-scale ballasted track experiment with eig...
Article
Full-text available
Discrete Element Method (DEM) simulations have the potential to provide particle-scale understanding of twin-screw granulators. This is difficult to obtain experimentally because of the closed, tightly confined geometry. An essential prerequisite for successful DEM modelling of a twin-screw granulator is making the simulations tractable, i.e., redu...
Poster
Full-text available
Wet granulation is a process used to create larger stable agglomerates (granules) from fine powders. However, despite wide adoption, it is often inefficiently operated, with high recycle ratios in continuous processes and high rejection rates in batch processes. This numerical study simulates a GEA ConsiGma™ 1 Twin Screw Granulator (TSG), following...
Chapter
With the rapid development of high-speed railway over the world in recent years, more and more researchers are focused on the strength, stiffness and stability of the embankment. It’s more and more popular to use the discrete element method (DEM) to study cemented granular materials (e.g. rocks and concrete). This paper verified the Timoshenko beam...
Poster
Full-text available
Wet granulation is a process used to create larger stable agglomerates (granules) from fine powders. However, despite wide adoption, it is often inefficiently operated, with high recycle ratios in continuous processes and high rejection rates in batch processes. This numerical study simulates a GEA ConsiGma™ 1 Twin Screw Granulator (TSG), following...
Poster
Full-text available
This study employs the Discrete Element Method (DEM) to study a 25 mm diameter, GEA ConsiGma™ 1 Twin Screw Granulator (TSG), with a typical 60°configuration for kneading elements. The DEM simulations were conducted using the commercial code. Wet granulation is a process used to create larger stable agglomerates (granules) from fine powders. It is c...
Poster
Full-text available
VELaSSCo (Visual Analysis for Extremely Large-Scale Scientific Computing) is an EC FP7 project involving a consortium of seven European partners (Fig. 1). VELaSSCo aims to provide new visual analysis methods for large-scale simulations serving the petabyte era. The main output of the project is the VELaSSCo platform which has been designed a...
Method
Full-text available
This guide provides a reference for how to successfully use the Timoshenko Beam Bond Model (TBBM) in EDEM® to model the three dimensional response of a cemented granular material under loading. A reference manual, which includes the theory of the TBBM and a description of the input parameters required to run the model, is available separately.
Method
Full-text available
A step-by-step example problem for the Edinburgh Elasto-Plastic Adhesion (EEPA) model. A confined/unconfined uniaxial compression problem is described.
Method
Full-text available
This reference manual provides the key information regarding an bonded beam contact model for EDEM that has been developed over many years at the University of Edinburgh. The contact model has been implemented as a User Defined Library (UDL) through the API capabilities of EDEM.
Method
Full-text available
Reference manual for the Edinburgh Elasto-Plastic Adhesion (EEPA) Model, available in EDEM. This guide provides the key information regarding an adhesive elasto-plastic contact model for EDEM that has been in development over many years at the University of Edinburgh. The contact model has been implemented as a User Defined Library (UDL) through t...
Conference Paper
Bulk handling of powders and granular solids is common in many industries and often gives rise to handling difficulties especially when the material exhibits complex cohesive behavior. In this study the effect of moisture on the level of cohesion, and thus handleability, of iron ore fines is investigated. The compression and flow function of the ir...
Poster
Full-text available
Powders and bulk solids are stored and handled in large quantities in many industries. The materials can differ greatly in size, shape and type but are commonly affected by handling and storage difficulties, such as the blockage of silo outlets or transfer points, which occur as a result of the development of cohesion. Adhesive forces between part...
Conference Paper
Full-text available
Bulk handling of powders and granular solids is common in many industries and often gives rise to handling difficulties especially when the material exhibits complex cohesive behaviour. For example, high storage stresses in a silo can lead to high cohesive strength of the stored solid, which may in turn cause blockages such as ratholing or arching...
Conference Paper
Full-text available
In this study, the behaviour of iron ore fines with varying levels of adhesion was investigated using a confined compression test and a uniaxial test. The uniaxial test was conducted using the semi-automated uniaxial EPT tester in which the cohesive strength of a bulk solid is evaluated from an unconfined compression test following a period of cons...
Article
In this paper, the loading behaviour of iron ore fines was investigated using both a confined compression test and a uniaxial test. This provides a comprehensive description of the material behaviour in terms of bulk compressibility, loading-unloading stiffness, unconfined strength and lateral pressure ratio. The effect of moisture content on the i...
Conference Paper
Full-text available
Many powders and particulate solids are cohesive in nature and the strength often exhibits dependence on the consolidation stress. As a result, the stress history in the material leading up to a handling scenario needs to be considered when evaluating its handleability. This paper outlines the development of a DEM contact model accounting for plast...
Conference Paper
The overall aim of this project was to relate Ground Penetrating Radar (GPR) to ballast fouling. The 10-year old University of Edinburgh full-scale trackbed was revisited and the fouling of the ballast was recalibrated following environmental changes, using the Ionescu fouling index. A series of GPR experiments were undertaken on the trackbed using...
Article
Full-text available
Many powders and particulate solids are stored and handled in large quantities in various industries. Many common handling and storage difficulties are caused by the material cohesion. The cohesive strength of a bulk material is a function of its past consolidation stress. For example, high material cohesive strength in a silo can result from high...
Article
Full-text available
Industrial processes in many sectors including pharmaceutical, food, and chemical sectors involve bulk materials with varying degree of cohesivity. Cohesive solids can experience a number of flow problems including arching, ratholing, segregation, channelling and flooding. A better understanding of these problems can help to improve the handling of...

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