FEM ConstraintHeatflux

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FEM ConstraintHeatflux.png FEM ConstraintHeatflux

Menu location
Model → Thermal Constraints → Constraint heatflux
Default shortcut
Introduced in version
See also
FEM tutorial


This constraint specifies film heat transfer of a surface at temperature T and with a film coefficient h to the environment or sink at temperature T0 . The convective heat flux q will satisfy: q = h(T -T0)


  1. Click on FEM ConstraintHeatflux.png or choose ModelThermal ConstraintsFEM ConstraintHeatflux.png Constraint heatflux from the top menu.
  2. Select in the 3D-view the surface(s) the constraint should be applied to.
  3. Enter the desired surface temperature, film coefficient and environment temperature.



  1. The constraint uses the *FILM card in CalculiX. The heatflux constraint is explained at http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node203.html