FEM ConstraintHeatflux/it
|
|
| Posizione nel menu |
|---|
| Modello → Vincoli termici → Vincolo scambio termico |
| Ambiente |
| FEM |
| Avvio veloce |
| Nessuno |
| Introdotto nella versione |
| - |
| Vedere anche |
| Tutorial FEM |
Descrizione
Questo vincolo specifica lo scambio termico (film heat transfer) di una superficie a temperatura T e con un coefficiente di scambio termico h e una temperatura ambiente T0 . Il flusso di calore convettivo q è in grado di soddisfare: q = h(T -T0)
Heat sink with convective heat flux load on the surfaces exposed to air
Utilizzo
- Cliccare su
o scgliere Modello → Vincoli termici → Vincolo Scambio termico dal menu principale. - Selezionare nella vista 3D la superficie a cui il vincolo deve essere applicato.
- Inserire la temperatura della superficie desiderata, il coefficiente del materiale e la temperatura ambiente.
Properties
- DatiAmbient Temp: Ambient temperature (for Convection and Radiation modes).
- DatiFilm Coef: Film coefficient (for Convection mode).
- DatiEmissivity: Emissivity (for Radiation mode).
- DatiDFlux: Distributed heat flux (for DFlux mode).
- DatiConstraint Type: Type of heat flux load: DFlux, Convection or Radiation.
- DatiCavity Radiation - introduced in 1.1: Enable cavity (surface-to-surface) radiation (for Radiation mode).
- DatiCavity Name - introduced in 1.1: Name of the cavity definition to which the heat flux constraint belongs (for Radiation mode).
- DatiEnable Amplitude - introduced in 1.1: Enables the use of CalculiX's amplitude for time variation of the heat flux load. At a given time, magnitude of the load is multiplied by the amplitude value corresponding to that time. Linear interpolation is used between the specified values. Constant values are used outside of the specified range.
- DatiAmplitude Values - introduced in 1.1: Amplitude table in the following format:
time_1, amplitude_value_1 …
- Default is linear increase from 0% at t=0 to 100% at t=1:
0, 0 1, 1
Note
- Il vincolo utilizza la *FILM card in CalculiX. Il vincolo scambio termico è spiegato in http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node203.html
FEM
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- Geometrical: Plane rotation, Section print, Transform
- Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight
- Thermal: Initial temperature, Heat flux, Temperature, Body heat source
- Overwrite Constants: Constant vacuum permittivity
- Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run
- Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
User documentation
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Assembly, BIM, CAM, Draft, FEM, Inspection, Material, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub