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Add Integrated Heatflux to Users Guide. #69

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Feb 2, 2022
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Add Integrated Heatflux to Users Guide. #69

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Add Integrated Heatflux to Users Guide.
TobiKattmann Jan 31, 2022
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Update _docs_v7/Markers-and-BC.md
TobiKattmann Jan 31, 2022
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11 changes: 10 additions & 1 deletion _docs_v7/Markers-and-BC.md
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Expand Up @@ -73,7 +73,16 @@ A wall with a prescribed constant heatflux is defined with the `MARKER_HEATFLUX`
MARKER_HEATFLUX = (Wall1, 1e05, Wall2, 0.0)
```

**Note**: Typically Navier-Stokes and RANS simulations are setup with adiabatic walls (heatflux = 0).
Instead of a constant heatflux (in `[W/m^2]`), a constant rate of heat flow (in `[W]`) can be prescribed by additionally adding the option `INTEGRATED_HEATFLUX= YES`. For the above `MARKER_HEATFLUX`, lets consider that `Wall1` has a surface area of 0.3 `[m^2]` then one could equivalently prescribe
```
MARKER_HEATFLUX = (Wall1, 0.3e05, Wall2, 0.0)
```

when additionally using the `INTEGRATED_HEATFLUX= YES` option. In the case of a DOE or an optimization this prescription of a rate of heat flow might be the more natural boundary condition.

**Notes**:
1. Typically Navier-Stokes and RANS simulations are setup with adiabatic walls (heatflux = 0).
2. `INTEGRATED_HEATFLUX` is not available for `FEM_NAVIER_STOKES`.

## Heat Transfer or Convection (no-slip) Wall ##

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