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📘 Gran-DEM Documentation
1. Introduction
The Gran-DEM particle flow simulator is a commercial particle flow DISCRETE ELEMENT METHOD (DEM) application that can be used to simulate particle flow in any type of pre-designed 3-D domain. This 3-D domain can be a mesh file (.msh) imported into the Gran-DEM application. The Gran-DEM application …
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📘 Gran-DEM Documentation
2.1 Description and theory
The Select Model dialog is the starting point for configuring a simulation in GranDEM. It allows users to activate the Continuous Fluid Phase (CFD), the Discrete Particle Phase (DEM), and define the coupling mechanisms between them. Depending on the selected options, GranDEM can perform pure CFD si…
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📘 Gran-DEM Documentation
3.1 Description and theory
The flow behaviour of materials is fundamentally characterised by their physical properties. Therefore, material properties of Eulerian fluids (liquid or gas) and Lagrangian particles (liquid or solid) during CFD flow simulations are extremely important while simulating system flow behavior. The Eu…
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📘 Gran-DEM Documentation
4.1 Description and theory
The main functionality of system motion is of relevance when DEM simulations need to be performed where the domain motion is also simulated alongside DEM particles. The domain motion here can be of two types namely; vibrational motion and rotational motion. Under this functionality the system domai…
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📘 Gran-DEM Documentation
4.2 Setting up
The System Motion module is used to define external motion fields acting on the simulation domain. These motion fields include Gravity, Vibration, and Rotation, allowing users to simulate stationary, vibrating, and rotating systems.To access this module, select System Motion from the left navigatio…
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📘 Gran-DEM Documentation
5.1 Description and theory
The Discrete element method-based particle tracking is governed by Newton’s law of motion. The dynamic motion of any particle ‘a’, defined vectorially in a 3-D space by position vector ‘ra’ and mass ‘ma’, is determined by the sum of the forces acting on the particle. This balance is provided hereby…
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📘 Gran-DEM Documentation
5.1.1 Gravity force
Gravity defines the natural influence of gravitation acting on the particle mass. It is given by Eq. (3.2): &nbs…
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📘 Gran-DEM Documentation
6.1 Description and theory
The injection of particles into the domain is set up in this functionality. Here a flexible injection system has been provided where user is able to choose from a variety of types of injection depending on requirement. There are 4 main types of injections that can be defined. They are; Injecti…
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📘 Gran-DEM Documentation
6.1.1 Injection type 1: Specific point injection:
This is a completely flexible injection option provided where individual independent injection points can be defined as needed by the user. Each injection point is specified with basic variables like particle diameter, number of particles per parcel, parcel diameter, X, Y, Z position point in 3D sp…
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📘 Gran-DEM Documentation
7.1.1 Single phase Eulerian flow model:
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📘 Gran-DEM Documentation
9.1 Description and theory:
The execute is the final property to be edited before running a simulation. Fig. 9.1 shows the middle pane that is observed on clicking the Execute in the left pane. Here the output settings, time step settings, end time settings and autoload visualization settings are made. The time step siz…
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📘 Gran-DEM Documentation
11.1 Description and theory:
This selection on the left pane is used after a simulation run has completed and output result data is available for paraview post-processing and visualization study. On selecting this the middle pane appears as shown in Fig. 11.1. Here in this feature various data type files can be loaded in…
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📘 Gran-DEM Documentation
2.2 Setting up
On the Main UI ‘Select Model’ setting from the left pane. Under the continuous phase drop down menu election for the Eulerian fluid flow method can be made or set off.If Fixed field, single phase Eulerian or single phase External (Fluent) is selected the user can switch on the fluid heat transfer a…
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📘 Gran-DEM Documentation
3.2 Setting up
On the Main UI, select ‘Material Properties’ from the left pane. This causes the component materials adding additional tabs in the middle pane to appear. This consists of the buttons ‘Add component’ and ‘Delete component’. Using the ‘Add component’ button new components can be added successive…
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📘 Gran-DEM Documentation
5.1.2 Collision force
Collision force is the summation of all direct contact collision forces experienced by the particle. The collision forces are treated by the soft sphere approach where a spring-dashpot method is applied. Therefore, any given particle ‘a’ can be simultaneously in collision with multiple particles ‘b…
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📘 Gran-DEM Documentation
5.2 Setting up
The Collision Force tab is used to define the contact force model governing interactions between discrete particles during DEM simulations. These parameters determine how particles behave when they come into contact with one another or with solid boundaries.GranDEM uses the Cundall–Strack Contact M…
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📘 Gran-DEM Documentation
6.1.2 Injection type 2: Cell centre fixed point injection:
Injection points are created at the cell centre positions of all the Eulerian grid in the system. This setting requires basic variables specified as particle diameter, number of particles per parcel, parcel diameter, X, Y, Z position point in 3D space, mean injection velocity in 3D space, Temperatu…
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📘 Gran-DEM Documentation
6.2 Setting up:
6.1 Injection Initialization – Specific Point InjectionThe Specific Point Injection method is used to introduce particles into the computational domain from one or more user-defined locations. Each injection point represents a particle source where particles are generated with specified physical pr…
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📘 Gran-DEM Documentation
9.2 Setting up:
The output path and output time interval needs to be set using the check boxes at the top. The output path is the path where the output data will be written.Check boxes for time step size, DEM steps/Time step, Number of time step simulations and End time have been provided in the center…
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📘 Gran-DEM Documentation
11.2 Setting up:
Check if paraview has been started. If not start paraview by clicking the button ‘Run Paraview’.The first tab ‘Grid view’ can be seen in Fig. 9.1 where 3 buttons have been provided to load either vtk, cgns or cas files. By selecting the check box ‘3D view’ and/or ‘Slice view’ Opacity and slice plan…
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