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chtMultiRegionSimpleFoam with porous solid region.

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Old   February 5, 2018, 14:58
Default chtMultiRegionSimpleFoam with porous solid region.
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Hi,

In the tutorial/example for chtMultiRegionSimpleFoam i.e., heatExchanger, the porous region is modeled as fluid. I am trying to model this as a solid region since there is a volumetric heat source. The solver utilizes interRegionHeatTransferModel between regions using constantheatTransfer model. Does this model always expect the porous region to be fluid ?? Because it is expecting a surfaceField 'phi' and is giving me an error message:

request for surfaceScalarField phi from objectRegistry porous failed
available objects of type surfaceScalarField are
0()

If possible, please point me to appropriate location from where this error could be originating...


Thanks
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Old   March 7, 2018, 08:35
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Adri
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Quote:
Originally Posted by srikanthallu View Post
Hi,

In the tutorial/example for chtMultiRegionSimpleFoam i.e., heatExchanger, the porous region is modeled as fluid. I am trying to model this as a solid region since there is a volumetric heat source. The solver utilizes interRegionHeatTransferModel between regions using constantheatTransfer model. Does this model always expect the porous region to be fluid ?? Because it is expecting a surfaceField 'phi' and is giving me an error message:
Hi, did you get more information about the way to consider the porous region? solid or fluid ?

Thanks,

Adrià
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Old   March 8, 2018, 19:30
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Derek Mitchell
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you cant model a porous region as a solid as you dont have the required fields e.g U . There is nothing stopping you having heat generation in a fluid using fvOptions.In fact it works very well.
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Old   March 9, 2018, 04:48
Default chtMultiRegionFoam for porous regions
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Quote:
Originally Posted by derekm View Post
you cant model a porous region as a solid as you dont have the required fields e.g U . There is nothing stopping you having heat generation in a fluid using fvOptions.In fact it works very well.
Ok Thanks Derek,

in my case I would like to use chtMultiRegionFoam (transient) to look to heat transfers between a flow of hot air going through a porous bed (cf attachement). It's not for a heatexchanger it would be more for a thermal storage of heat in porous bed. So I don't need ther constantHeatSource but more a porosity modeling.

Do you think that I can introduce in constant/porous/fvOptions :
- a darcy forcheimer porosity model (with explicitPorositySource)
- with a radial porosity profile ?
- with a interfacial area density definition, (i.e the ratio of the area of the fluid / solid interface and the volume of the porous zone)
- heat transfer law modeling between fluid & porous bed (non-thermal equilibrium)

Thanks again for your help !

Adrià
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