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Choose User defined (the default), to define a value or expression for the density in the Density expression field (SI unit: kg/m3). For example, material.rho, which is a variable for the density from the materials in the model. Use the Density input frame list to specify the frame in which the density is given. The default Material frame indicates that the given density expression is not a function of the strain; Spatial frame indicates that the density expression is an instantaneous value dependent on the material strain. Note that the actual coordinate names — typically (x, y, z) or (X, Y, Z) in 3D — are displayed for each frame.
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Choose From physics interface to take the density from an active physics interface in the geometry. Not all physics interfaces define such density variables. If there are two or more physics interfaces that provide a density in the same domain, the density used can be from any of the physics interfaces (but the density is then typically the same in those physics interfaces). The Include adjacent entities of lower dimension check box is selected by default to include the density also on adjacent boundaries, edges, and points.
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Choose From specified physics interface to take the density from a physics interface that you choose from the Physics list. The Include adjacent entities of lower dimension check box is selected by default to include the density also on adjacent boundaries, edges, and points.
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Create volume variable to create a variable for the volume of the selected geometric entities.
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Create mass variable to create a variable for the mass of the selected geometric entities.
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Create center of mass variables to create variables for the center of mass of the selected geometric entities.
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Create moment of inertia variables to create variables for the moment of inertia of the selected geometric entities.
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Create principal moment of inertia variables to create variables for the principal moment of inertia of the selected geometric entities.
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