Extract data with c++ code

MaximeB · May 14, 2019, 05:47

Hi everyone,

I am currently working on a fsi model and I need to create my own routine to set an external effort on my solid.

The question is: how can I extract my Usolid at each time step to use them after.

I've tried something like:

Code:

double uSolidExtracted[3][nbElem];

uSolidExtracted = Usolid.boundaryField()[myPatch];

But, I have an error:

Code:

error: incompatible types in assignment of 'Foam::fvPatchField<Foam::Vector<double> >' to 'double [3][nbElem]'

Thank you,
Maxime.

simrego · May 14, 2019, 06:18

Hi!

You are trying to pass a double array to a vector patch field, that's why you can't compile.
uSolidExtracted should be a type of fvPatchField<Vector<double>>, not a double. And It'll be fine.
I don't know your problem exactly but I think it is a bit easier to use a coded BC or write your own BC. Then you can manipulate your boundary faces in the correct place, not inside the solver.

MaximeB · May 14, 2019, 07:36

Thank you for the reply

Yes I will consider to code my own BC

May 14, 2019, 05:47	Extract data with c++ code	#1
MaximeB New Member Maxime Join Date: Mar 2019 Location: Paris Posts: 5 Rep Power: 7	Hi everyone, I am currently working on a fsi model and I need to create my own routine to set an external effort on my solid. The question is: how can I extract my Usolid at each time step to use them after. I've tried something like: Code: double uSolidExtracted[3][nbElem]; uSolidExtracted = Usolid.boundaryField()[myPatch]; But, I have an error: Code: error: incompatible types in assignment of 'Foam::fvPatchField<Foam::Vector<double> >' to 'double [3][nbElem]' Thank you, Maxime.

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May 14, 2019, 06:18		#2
simrego Senior Member anonymous Join Date: Jan 2016 Posts: 416 Rep Power: 14	Hi! You are trying to pass a double array to a vector patch field, that's why you can't compile. uSolidExtracted should be a type of fvPatchField<Vector<double>>, not a double. And It'll be fine. I don't know your problem exactly but I think it is a bit easier to use a coded BC or write your own BC. Then you can manipulate your boundary faces in the correct place, not inside the solver.

May 14, 2019, 07:36		#3
MaximeB New Member Maxime Join Date: Mar 2019 Location: Paris Posts: 5 Rep Power: 7	Thank you for the reply Yes I will consider to code my own BC