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Calculating averages within OpenFOAM

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Old   January 17, 2020, 13:42
Default Calculating averages within OpenFOAM
Ben Simpson
Join Date: Dec 2019
Location: UK
Posts: 32
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Hi CFD Experts,

I am quite new to OpenFOAM. I am trying to run a simple natural ventilation simulation of a simple box model building. I am running buoyantBoussinesqSimpleFoam on OpenFOAM V1812.

I am wanting to calculate average values of certain fields for specific areas of the model. For example, I am simulating CO2 and I want to get an averaged CO2 concentration within a pre-defined area inside my building and I also want to calculate the total CO2 concentration entering and leaving my building through the two window openings.

I am not sure how this is suppose to be accomplished in OpenFOAM. My current attempt involves using topoSet to generate cellZoneSets which I then want to use the fieldAverage on from the controlDict.

I have two main questions regarding this task:

1. Is this approach, that I am trying to get working, the correct/best method for calculating these sorts of averages?

2. I am currently getting a fatal error when I run buoyantBoussinesqSimpleFoam saying that Entry 'Type' not found in dictionary "IOstream.zone1". Providing that the answer to question 1 is that this is the best method, what 'Type' should I use in the constant/fvOptions file?

I have looked through the available 'Type' choices but I am unsure which one, if any, are correct for this situation.

For information I have attached screen shots of my error message, controlDict, topoSetDict and fvOptions.

Any support on this issue would be much appreciated.

Attached Images
File Type: png controlDict.PNG (11.7 KB, 20 views)
File Type: png error.PNG (11.5 KB, 13 views)
File Type: png fvOptions.PNG (14.1 KB, 16 views)
File Type: png topoSetDict.PNG (17.5 KB, 12 views)
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average field, buoyantboussinesqsimple, openfoam

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