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# Volume Heat Flux

The volume heat flux boundary condition acts like a volumetric heat source. This type of boundary condition is used for analysis types involving heat transfer. The figure below shows the necessary input parameters:

Users should define the volumetric Heatflux value, in units of $$[W/m³]$$ or $$[\frac {Btu}{s.in^3}]$$. The resulting heat flux will depend on the volume of the assignment.

Besides a fixed value, it is also possible to use tables and formulas to input the heat flux.

## Applications

The Volume heat flux boundary condition can be used to define the heat-generating components. In transient analysis, you can define heat generation as time-dependent with the help of tables. Read more about it in the following knowledge base article

Important

The heat flux can be positive or negative. For a positive input, heat goes into the domain.
For a negative value, heat is removed from the volume.

## Other Types of Heat Flux

In addition to volume heat flux, Simscale also offers surface heat flux and convective heat flux boundary conditions.

Last updated: August 12th, 2022