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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
4.2 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
7.1.1 Single phase Eulerian flow model:
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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
5.2 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
6.2 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
7.1.2 Single phase Eulerian energy model:
The individual fluid species modeled as scalar transport are given by; (8.5)Where; \(C_{p,m}\) is the mean…
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📘 Gran-DEM Documentation
7.2 Setting up:
On the UI upper pane, select ‘Fluid flowsolver’. This gives the selection pane on the left pane to make fluid flowsolver model choices and settings as shown in Fig. 8.1.The selections include Method (compressible or incompressible), Scheme (implicit or explicit), viscosity (Laminar or any turbulenc…
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📘 Gran-DEM Documentation
8.2 Setting up:
On the UI upper pane, select ‘Boundary condition’. This gives the selection pane on the left pane to make fluid flowsolver model choices and settings as shown in Fig. 8.1.The selections include Method (compressible or incompressible), Scheme (implicit or explicit), viscosity (Laminar or any turbule…
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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
5.1.3 Interphase drag force
The drag force is the force acting on particles due to fluid phase (gas or liquid) flowing around it. It is essentially the momentum transferred by the fluid phase due to friction when flowing passed the surface of the particle. This force typically can be modelled through a one way or a two-way co…
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📘 Gran-DEM Documentation
7.1.3 Single phase Eulerian species model:
The individual fluid species modeled as scalar transport are given by; …
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