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Is there a bug in externalWallHeatFluxTemperature boundary condition ?

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Old   September 19, 2021, 20:06
Default Is there a bug in externalWallHeatFluxTemperature boundary condition ?
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Hi Everyone,

I am simulating evaporation/condensation using icoReactingMultiphaseInterFoam. I need to apply a uniform heat flux boundary condition over a wall. Hence, I chose to use externalWallHeatFluxTemperature boundary condition. But, my temperatures were very high and unphysical. Then, I plotted the wall heat flux and found that they are very high than the values I set. Is it a bug in externalWallHeatFluxTemperature boundary condition ?

I am aware that I could use fixedGradient = heat flux/kappa. But, as I am working on a multiphase flow getting the right value of kappa is a bit complex. However, I am working on groovyBC to use a gradient Expression with the expression of kappa.

But, still externalWallHeatFluxTemperature boundary condition would be a straight forward solution for me.

Kindly please advice me on this.

Thank You.

With Thanks,
Pavithra.
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Old   January 12, 2022, 16:35
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Julio Pieri
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I've been using this BC for long time without bug. However it is hard get proper variables, as you have many influencing parameters. I'd recommend going back to paper and pen and see if the heat balance of you walls make sense.

If you are using qr, then it's very important to use qrRelaxation
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