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Merged
merged 3 commits into from
Jul 31, 2021
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Feature heattransfer wall #57

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cb34412
Add explanation for heattransfer wall
TobiKattmann Jul 31, 2021
9d008e1
Merge remote-tracking branch 'origin/develop' into feature_heattransf…
TobiKattmann Jul 31, 2021
4900a7f
minor updates to heat transfer bc explanation
TobiKattmann Jul 31, 2021
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15 changes: 15 additions & 0 deletions _docs_v7/Markers-and-BC.md
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Expand Up @@ -10,6 +10,7 @@ The term *Marker* refers to a named entity in your mesh file. Boundary condition
- [Euler (Slip) Wall](#euler-slip-wall)
- [Symmetry Wall](#symmetry-wall)
- [Constant Heatflux (no-slip) Wall](#constant-heatflux-no-slip-wall)
- [Heat Transfer or Convection (no-slip) Wall](#heat-transfer-or-convection-no-slip-wall)
- [Isothermal (no-slip) Wall](#isothermal-no-slip-wall)
- [Farfield Boundary Condition](#farfield-boundary-condition)
- [Inlet Boundary Condition](#inlet-boundary-condition)
Expand Down Expand Up @@ -74,6 +75,20 @@ MARKER_HEATFLUX = (Wall1, 1e05, Wall2, 0.0)

**Note**: Typically Navier-Stokes and RANS simulations are setup with adiabatic walls (heatflux = 0).

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

| Solver | Version |
| --- | --- |
| `NAVIER_STOKES`, `RANS`, `INC_NAVIER_STOKES`, `INC_RANS` | 7.0.0 |


A wall with a prescribed locally variable heatflux via a heat transfer coefficient and and a Temperature at infinity (or reservoir Temperature) is defined with the `MARKER_HEATTRANSFER` option. The heatflux `q` computes to `q = h(T_inf - T_wall)`, where `T_wall` is the local wall temperature and therefore no user input. The option format is the marker name followed by the value of the heat-transfer coefficient (in Watts per square meter and Kelvin `[W/(m^2*K)],[J/(s*m^2*K)]`) and the value of the Temperature at infinity (in Kelvin `[K]`), e.g.
```
MARKER_HEATTRANSFER = (Wall1, 10.0, 350.0, Wall2, 5.0, 330.0, ...)
```

**Note**: The Heat Transfer Wall degenerates to an adiabatic wall when the heat transfer coefficient is zero. On the other extreme (a very high heat transfer coefficient) the Heat Transfer Wall degenerates to an isothermal wall with Temperature at infinity being the wall temperature.

## Isothermal (no-slip) Wall ##

| Solver | Version |
Expand Down