Boundary Conditions

Boundary conditions can either be defined on the grid or on the parts (material points). The grid represents the user defined space in which the parts are allowed to move. Similar selection techniques to the one for loading conditions are used. There are no restrictions on the geometrical complexity of the boundary conditions.

Defining Boundary Conditions on Parts (Material Points)

Step 1: Select the relevant material points using the Selection Tools. Alternatively, to set whole parts as boundary conditions, select parts from the model tree.Click 'New', 'Add' or ‘Remove'.

Step 2: Click on the ‘Assign boundary conditions to selected particles’ tool.

Step 3: Choose whether to apply boundary conditions to ‘Selected Particles’, ‘Selected Parts’ or ‘Grid’ (nearest grid nodes to selected particles) as appropriate.

Step 4: Click OK.

Note that when defining boundary conditions on material points motion is restrained in all directions.Defining a whole part(s) as a boundary condition effectively turns it into a rigid immovable object.

Boundary Conditions on Material Points

Defining Boundary Conditions on Grid Nodes

Step 1: Click on the ‘Select Plane (Grid Nodes)’ tool.

Step 2 (optional): Displace the assembly within the grid by specify x,y and z displacements.

Step 3 (optional): Tick ‘Exclude’ to exclude grid nodes lying inside the CAD parts.

Step 4: Select a plane by using the X,Y or Z slider. Alternatively a plane location can be specified using the 'Key in values of x,y and z' tool in the top toolbar.Keybooard

Step 5 (optional): Use 2D selection tools to sub-select nodes on the selected plane. Click ok to proceed to 7.

Step 6: Click ‘New’.

Boundary Conditions on Grid Nodes

Note that defining grid node boundary conditions near a CAD part will apply those boundary conditions to any material points within that cell even if the CAD part is not in direct contact with those grid nodes.

Boundary Conditions on Grid Nodes 2

Step 7: Select directions to restrain.

Step 8: (optional) Fill in ‘Depth Limits’ to replicate the 2D selection along the depth.

Step 9: Click ok.

Boundary Conditions on Grid Nodes 2

MPMsim Tutorial: Applying Boundary Conditions


      1. Mac
      2. Linux
      3. Widows
      1. Starting MPMsim
      2. Quitting MPMsim
      1. Activating License
      2. Deactivating License
    1. Overview
    2. CAD Import
    3. Selection Tools
    4. Loading Conditions
    5. Boundary Conditions

Contact information

MPMsim Ltd.


83 Ducie Street


M1 2JQ

United Kingdom


skype: MPMsim

email: [email protected]

phone: +44 161 298 1984


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