28.2.2 Fluid element library

Products: Abaqus/CFD  Abaqus/CAE  

Reference

Overview

This section provides a reference to the fluid elements available in Abaqus/CFD.

Element types

Fluid elements

FC3D44-node tetrahedron
FC3D66-node prism
FC3D88-node brick

Active degrees of freedom

The active degrees of freedom depend on the analysis procedure and options, such as the energy equation and turbulence model. For more information, see Active degrees of freedom” in “Boundary conditions in Abaqus/CFD, Section 33.3.2.

Additional solution variables

None.

Nodal coordinates required

X, Y, Z

Element property definition

Input File Usage:          Use either of the following options:
*FLUID SECTION
*SOLID SECTION

Abaqus/CAE Usage:   

Property module: Create Section: select Fluid as the section


Element-based loading

Distributed loads

Distributed loads are available for all fluid element types. They are specified as described in Distributed loads, Section 33.4.3.


Load ID (*DLOAD):  BX

Abaqus/CAE Load/Interaction:  Body force

Units:  FL–3

Description:  Body force in global X-direction.


Load ID (*DLOAD):  BY

Abaqus/CAE Load/Interaction:  Body force

Units:  FL–3

Description:  Body force in global Y-direction.


Load ID (*DLOAD):  BZ

Abaqus/CAE Load/Interaction:  Body force

Units:  FL–3

Description:  Body force in global Z-direction.


Load ID (*DLOAD):  GRAV

Abaqus/CAE Load/Interaction:  Gravity

Units:  LT–2

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


Load ID (*DLOAD):  PDBF

Abaqus/CAE Load/Interaction:  Porous drag body force

Units:  None

Description:  Porous drag body force load (specify porosity as the input).

Distributed heat fluxes

Distributed heat fluxes are available when the temperature equation is activated on the analysis procedure. They are specified as described in Thermal loads, Section 33.4.4.


Load ID (*DFLUX):  BF

Abaqus/CAE Load/Interaction:  Body heat flux

Units:  JL–3T–1

Description:  Heat body flux per unit volume.

Surface-based loading

Distributed heat fluxes

Surface-based heat fluxes are available for all elements when the temperature equation is activated on the analysis procedure. They are specified as described in Thermal loads, Section 33.4.4.


Load ID (*DSFLUX):  S

Abaqus/CAE Load/Interaction:  Surface heat flux

Units:  JL–2T–1

Description:  Heat surface flux per unit area into the element surface.

Element output

Element output is always in the global directions.

Node ordering and face numbering on elements

All elements

Tetrahedral element faces

Face 11 – 3 – 2 face
Face 21 – 2 – 4 face
Face 32 – 3 – 4 face
Face 41 – 4 – 3 face

Wedge (triangular prism) element faces

Face 11 – 3 – 2 face
Face 24 – 5 – 6 face
Face 31 – 2 – 5 – 4 face
Face 42 – 3 – 6 – 5 face
Face 51 – 4 – 6 – 3 face

Hexahedron (brick) element faces

Face 11 – 4 – 3 – 2 face
Face 25 – 6 – 7 – 8 face
Face 31 – 2 – 6 – 5 face
Face 42 – 3 – 7 – 6 face
Face 53 – 4 – 8 – 7 face
Face 61 – 5 – 8 – 4 face