F-DEMPack Tutorial 2: Annular pipe

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Before starting with this tutorial, the user is strongly encouraged to follow the D-DEMPack Tutorial 2: Conveyor belt to get a feeling of how the problem type works, and in particular the DEM section. This tutorial will focus mainly in the Fluid section and its particularities.


The process should start by creating a new geometry from scratch, by modifying an existing one or by opening a finished one. It is assumed that the user already knows how to do this procedure so no details will be given about it.

In this tutorial, a simple geometry was created for the sake of simplicity. The idea is to understand all the steps involved in the problem type. The user must start by downloading the file File:F DEMPack2 Tutorial 6.gid.zip, which contains the geometry and mesh of the proposed geometry. This file has already created the groups that will be used in the simulation.

F-DEM Tutorial6 Geometry.png

The geometry of study consists of an annular tube through which a flux of an intermediate viscosity mud passes. An inlet creating DEM particles with time is located in the base of the annular pipe.


We will continue by defining the properties of the fluid in the simulation. We just have to click on the icon showing in the next figure to open the menus and in particular the Materials tab:

F-DEM Tutorial6 MatIcon.png

To begin inserting the fluid properties, we click on Fluid and then on the plus button at the bottom of the window to add a new Fluid material.

F-DEM Tutorial6 AddMat.png

The next figure shows the details of the material parameters that have been used in this example.


To fill in or modify the value of the parameters, just double-click on the corresponding current data. The data above corresponds to an intermediate viscosity mud.

The same process can be followed, in this case, for the DEM material. We unfold the DEM-Defaultmaterial submenu at the bottom of the same window and fill the fields with the appropriate data. See Figure 6.


DEM Entities

The file contains several entities and conditions in relation to the DEM part of the problem. As previouly said, they are already preassigned so the user does not have to bother and can concentrate on the fluid aspects and details of the simulation. Nevertheless, figures showing the details on the DEM parts will be added here for the sake of completion and as a reference should the user lose these settings or in the case of have any problem when loading the file.

DEM group

The downloaded file has already created the groups that will be used in the simulation.

F-DEM Tutorial6 Groups.jpg.png

In this sample case, the following five groups were created: Dem_inlet, Fluid, Inlet, No_slip and Outlet. The lower circle (surface) would be the Inlet, the smaller one just on top of it was the DEM_Inlet, the circle at the top would represent the Outlet, the No_slip would be the walls of the cylinder and, finally, the volume named Fluid would constitute the mass of fluid.

DEM-FEM wall group

Inlet DEM group

DEM Initial Conditions





Boundary Conditions

DEM-Fluid Interaction Settings

Meshing and Running


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