Eulerian Element Library

This section provides a reference to the Eulerian elements available in Abaqus/Explicit.

This page discusses:

 

See Also
Eulerian Analysis
*EULERIAN SECTION

Element Types

Eulerian Stress/Displacement Element

EC3D8R

8-node linear brick, multimaterial, reduced integration with hourglass control

Active Degrees of Freedom

1, 2, 3

Additional Solution Variables

None.

Eulerian Thermally Coupled Element

EC3D8RT

8-node thermally coupled linear brick, multimaterial, reduced integration with hourglass control

Active Degrees of Freedom

1, 2, 3,11

Additional Solution Variables

None.

Nodal Coordinates Required

X, Y, Z

Element Property Definition

You must specify a list of materials that may be present in the Eulerian element. You can also assign a material instance name to each material (see Eulerian Section Definition).

Element-Based Loading

Distributed Loads

Distributed loads are available only for Eulerian elements. They are specified as described in Distributed Loads.

*dload
  1. Load ID (*DLOAD): BX
  2. FL−3

  3. Body force in global X-direction.

  1. Load ID (*DLOAD): BY
  2. FL−3

  3. Body force in global Y-direction.

  1. Load ID (*DLOAD): BZ
  2. FL−3

  3. Body force in global Z-direction.

  1. Load ID (*DLOAD): BXNU
  2. FL−3

  3. Nonuniform body force in global X-direction with magnitude supplied via user subroutine DLOAD in Abaqus/Standard and VDLOAD in Abaqus/Explicit.

  1. Load ID (*DLOAD): BYNU
  2. FL−3

  3. Nonuniform body force in global Y-direction with magnitude supplied via user subroutine DLOAD in Abaqus/Standard  and VDLOAD in Abaqus/Explicit.

  1. Load ID (*DLOAD): BZNU
  2. FL−3

  3. Nonuniform body force in global Z-direction with magnitude supplied via user subroutine DLOAD in Abaqus/Standard  and VDLOAD in Abaqus/Explicit.

  1. Load ID (*DLOAD): GRAV
  2. LT−2

  3. Gravity loading in a specified direction (magnitude is input as acceleration).

  1. Load ID (*DLOAD): Pn
  2. FL−2

  3. Pressure on face n.

  1. Load ID (*DLOAD): PnNU
  2. FL−2

  3. Nonuniform pressure on face n with magnitude supplied via user subroutine DLOAD in Abaqus/Standard and VDLOAD in Abaqus/Explicit.

  1. Load ID (*DLOAD): SBF
  2. FL−5T2

  3. Stagnation body force in global X-, Y-, and Z-directions.

  1. Load ID (*DLOAD): SPn
  2. FL−4T2

  3. Stagnation pressure on face n.

  1. Load ID (*DLOAD): TRSHRn
  2. FL−2

  3. Shear traction on face n.

  1. Load ID (*DLOAD): TRVECn
  2. FL−2

  3. General traction on face n.

  1. Load ID (*DLOAD): VBF
  2. FL−4T

  3. Viscous body force in global X-, Y-, and Z-directions.

  1. Load ID (*DLOAD): VPn
  2. FL−3T

  3. Viscous pressure on face n, applying a pressure proportional to the velocity normal to the face and opposing the motion.

Distributed Heat Fluxes

Distributed heat fluxes are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*dflux
  1. Load ID (*DFLUX): BF
  2. JL−3T−1

  3. Heat body flux per unit volume.

  1. Load ID (*DFLUX): Sn
  2. JL−2T−1

  3. Heat surface flux per unit area into face n.

Film Conditions

Film conditions are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*film
  1. Load ID (*FILM): Fn
  2. JL−2T−1θ−1

  3. Film coefficient and sink temperature (units of θ) provided on face n.

Radiation Types

Radiation conditions are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*radiate
  1. Load ID (*RADIATE): Rn
  2. Dimensionless

  3. Emissivity and sink temperature (units of θ) provided on face n.

Surface-Based Loading

Distributed Loads

Surface-based distributed loads are available for Eulerian elements. They are specified as described in Distributed Loads.

*dsload
  1. Load ID (*DSLOAD): P
  2. FL−2

  3. Pressure on the element surface.

  1. Load ID (*DSLOAD): PNU
  2. FL−2

  3. Nonuniform pressure on the element surface with magnitude supplied via user subroutine DLOAD in Abaqus/Standard and VDLOAD in Abaqus/Explicit.

  1. Load ID (*DSLOAD): SP
  2. FL−4T2

  3. Stagnation pressure on the element surface.

  1. Load ID (*DSLOAD): TRSHR
  2. FL−2

  3. Shear traction on the element surface.

  1. Load ID (*DSLOAD): TRVEC
  2. FL−2

  3. General traction on the element surface.

  1. Load ID (*DSLOAD): VP
  2. FL−3T

  3. Viscous pressure applied on the element surface. The viscous pressure is proportional to the velocity normal to the element face and opposing the motion.

Distributed Heat Fluxes

Surface-based heat fluxes are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*dsflux
  1. Load ID (*DSFLUX): S
  2. JL−2T−1

  3. Heat surface flux per unit area into the element surface.

Film Conditions

Surface-based film conditions are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*sfilm
  1. Load ID (*SFILM): F
  2. JL−2T−1θ−1

  3. Film coefficient and sink temperature (units of θ) provided on the element surface.

Radiation Types

Surface-based radiation conditions are available only for EC3D8RT elements. They are specified as described in Thermal Loads.

*sradiate
  1. Load ID (*SRADIATE): R
  2. Dimensionless

  3. Emissivity and sink temperature (units of θ) provided on the element surface.

Element Output

A set of output variables is written for each Eulerian material instance listed in the Eulerian section definition. The output variable names are automatically appended with the material instance names. For example, if you define material instances named “steel” and “tin” and request stress output, the first stress components will be written to separate output variables named “S11_steel” and “S11_tin.”

All output is given in global coordinates.

Stress and Other Tensor Components

Stress and other tensors (excluding total strain tensors) are available. All tensors have the same components. For example, the stress components are as follows:

S11

X⁢X, direct stress.

S22

Y⁢Y, direct stress.

S33

Z⁢Z, direct stress.

S12

X⁢Y, shear stress.

S13

X⁢Z, shear stress.

S23

Y⁢Z, shear stress.

Element-Averaged Quantities

Several output variables are also available as element-averaged quantities. These variables are computed as a volume fraction weighted average of all materials present in the element. Use of these variables can substantially decrease the size of the output database for models with many Eulerian materials. For example:

SVAVG

Volume fraction averaged stress.

Node Ordering and Face Numbering on Elements

All elements must have eight nodes. Degenerate elements are not supported.

Table 1. Element faces
Face 1 1 – 2 – 3 – 4 face
Face 2 5 – 8 – 7 – 6 face
Face 3 1 – 5 – 6 – 2 face
Face 4 2 – 6 – 7 – 3 face
Face 5 3 – 7 – 8 – 4 face
Face 6 4 – 8 – 5 – 1 face

Numbering of Integration Points for Output

The single integration point is located at the centroid of the element. All materials within the element are evaluated at this integration point.