28.2.2 Fluid element library
Products: Abaqus/CFD Abaqus/CAE
Element types
Fluid elements
| FC3D4 | 4-node tetrahedron |
| FC3D5 | 5-node pyramid |
| FC3D6 | 6-node prism |
| FC3D8 | 8-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 34.3.2.
Element property definition
| Input File Usage: | Use the following option to define the element properties for flows: |
*FLUID SECTION Use the following option to define the element properties for heat transfer without flows: *SOLID SECTION |
| Abaqus/CAE Usage: | In Abaqus/CAE you can only define the element properties for flows. |
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 34.4.3.
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 34.4.4.
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 34.4.4.
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.
Film conditions
Surface-based film conditions are available for all elements when the temperature equation is activated on the analysis procedure. They are specified as described in “Thermal loads,” Section 34.4.4.
Load ID (*SFILM): F
Abaqus/CAE Load/Interaction: Surface film condition
Units: JL–2T–1
–1
Description: Film coefficient and sink temperature (units of ) provided on the element surface.
Radiation types
Surface-based radiation conditions are available for all elements when the temperature equation is activated on the analysis procedure. They are specified as described in “Thermal loads,” Section 34.4.4.
Load ID (*SRADIATE): R
Abaqus/CAE Load/Interaction: Surface radiation
Units: Dimensionless
Description: Emissivity and sink temperature (units of ) provided on the element surface.
