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problem with timeVaryingMappedFixedValue

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Old   April 23, 2016, 05:17
Default problem with timeVaryingMappedFixedValue
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Lorenzo
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Hello everyone,

I'm trying to solve a problem in which an inlet patch, called "throat", is defined.
On this patch I would like to impose a time varying boundary condition on pressure, through timeVaryingMappedFixedValue.
I followed the tutorial pitzDailyExptInlet but still I have doubts about the meaning of the files "points" ( under constant/boundaryData/Inlet) and the time directory "0" (under constant/boundaryData). In that case unstedy BC where on U field, here on pressure but that should not be an issue.

So my questions are :
1) what does the file "points" stand for? ( maybe the location in terms of xyz coordinates of points , where time-varying BC is to be applied?)

2)what do I have to specify in constant/boundaryData/throat/0 directory ? ( I thought initially the value at different times of my pressure profile )

I'm rather new to this BC so presumably I am wrong in several points, any help would be very appreciated.

Thanks
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Old   October 11, 2016, 07:47
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Laurent DASTUGUE
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Hi Lorenzo,

Quote:
1) what does the file "points" stand for?
the file "points" include the coordinates of alle the points of the patch concerned. I use to obtain it by a paraview command (include sets, save data, .csv....).

Quote:
what do I have to specify in constant/boundaryData/throat/0 directory ?
you have to write the correct data (pressure in your case) for each point of the patch. If you don't have the datas on points, but on cells, this is not the correct BC to use.

Hope it has helped you a little.
Laurent
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Old   October 12, 2016, 04:41
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Lorenzo
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Thank you very much laurentD for your clear answer, it helps a lot.
To be sure I understood your explanation correctly: when you refer to point you don't think about cell's centroid, they are just the vertex point of a particular boundary face. Is this correct?
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Old   November 18, 2016, 10:15
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Laurent DASTUGUE
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Sorry i haven't seen your answer.

Yes it refers to the vertex points related to the patch concerned. It is used by OF to associate a value (so the pressure in your case) with the correct position.

I'm not sure (maybe someone will read our conversation and confirm it) but i think that the word ...mapped... is used to indicate that the values are plotted on points instead of faces.

But what i'm sure is the signification of points ;-)

Have a good day.

L.
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