[xishan555]

Hi guys,

does anyone has experiences to deal with the time-dependent heat flux boundary condition? Specially, I'm using externalWallHeatFluxTemperature now and defining a heat flux q. Everything works just fine when the heat flux is constant. However, when I try to think about time varying heat flux, I realise that I dont have to much chooses. The tutorial lists following BCs which seem are all about velocites and pressures:

• flowRateInletVelocity: inlet condition with time-varying flow-rate.
• oscillatingFixedValue: oscillatory fixed value condition with time-varying amplitude and frequency.
• rotatingPressureInletOutletVelocity: total pressure condition for a rotating patch with time-varying angular velocity.
• rotatingTotalPressure: total pressure condition for a rotating patch with time-varying angular velocity.
• rotatingWallVelocity: velocity condition for a rotating boundary, e.g. a wheel, with time-varying angular velocity.
• uniformFixedValue: general fixed value condition with time-varying value.
• uniformTotalPressure: total pressure condition with time-varying pressure.

Does anyone has faced with this problem before or has the experience of implementation of such BCs?


Thanks for your advices!


Long

[jherb]

You have to create your own version of the externalWallHeatFluxTemperature boundary condition, following the example of the uniformValue boundary condition (https://github.com/OpenFOAM/OpenFOAM...formFixedValue). Your internal variable for the heat flux has to be be a DataEntry variable (see http://www.openfoam.org/version2.1.0...conditions.php), something like:

autoPtr<DataEntry<scalar> > qEntry_;

Then in the updateCoeffs() method of your boundary condition, you can access the time dependent value like here:
https://github.com/OpenFOAM/OpenFOAM...chField.C#L145