[klausb]

Hello,

I want to dynamically adjust values in fvSolutions e.g. change minIters based on certain criteria from 1 to 3; I know how to access (read) values but I can't figure out how to overwrite values in fvSolutions.

How can that be done?

Klaus

[Tobi]

Do you mean inside the FOAM code? E.g. in the source of a solver? If so, why you do not access directly to the value and manipulate it? The way you like to go can be done by calling a script that is changing the value (but this is a really bad workaround - but possible )

[GerhardHolzinger]

The test-application Test-fvSolutionCombine demonstrates the manipulation of the contents of fvSolution. This code would make a good starting point for whatever you want to manipulate in fvSolution.

[Tobi]

Gerhard 's test application can be found in:

../OpenFOAM/OpenFOAM-dev/applications/test/fvSolutionCombine

and is actually what I wanted to say with my first statement.

Thanks Gerhard for mentioning that. I totally forgot this folder

[klausb]

Well, that's a separate application, I want to change values at p, U, k level from within a new solver, doing it manually is not very effective, the required adjustments are too frequent at times.

By the way, are p U, k subsubdictionaries?

fvSsolution > solvers > p { value_to_be_adjusted_dynamically 10; }

I tried this but the declarations are not valid for some reason:

//IO test changing p-minIter value in fvSolutions file

// Declare dictionary
IOdictionary fvSolution(IOobject("fvSolution",runTime.system(),mesh,IOobject::NO_READ,IOobject::AUTO_WRITE));

// Declare subdictionary
dictionary mySubDictUpdate(fvSolution.subDict("p"));

// Update some values
mySubDictUpdate.set("minIter", 33 );
mySubDictUpdate.set("maxIter", 500 );


// Write updates to dictionary/subdictionary
fvSolution.Foam::IOobject::write();

Klaus

[Huipeng Xiao]

HI:
I have write a test code for you as blew:

IOdictionary solutionDict
(
IOobject
(
dictName,
runTime.system(),
runTime,
IOobject::MUST_READ_IF_MODIFIED,
IOobject::AUTO_WRITE,
)
);

dictionary& PisoDict = solutionDict.subDict("PISO");

entry* PisoEntry = PisoDict.lookupEntryPtr("nCorrectors", 0, 1);

primitiveEntry* PisoEntryPrim = dynamic_cast<primitiveEntry*>(PisoEntry);

label val(9);

(*PisoEntryPrim)[0] = val;

solutionDict.regIOobject::write();

The code have given a right result .

[Huipeng Xiao]

the best way to know what debug in your code is using a debuger trace your code.

Sent from my Le X620 using CFD Online Forum mobile app

[Tobi]

My suggestion is to manipulate the object directly and not by building a new one. However, both work and it is up to you.

word sol = "none";

if (for any reason you want to change something for U )
{
    sol = "U";
}

Dictionary& directAccesss = mesh.solverDict(sol);

//- And then get access to maxIter or minIter and change it
.
.
.

[klausb]

Problem is, I keep getting compile errors telling me that many things are not declared in this scope.

exGMRES.C:124:1: error: ‘IOdictionary’ was not declared in this scope
 IOdictionary fvSolution(IOobject("fvSolution",runTime.system(),runTime,IOobject::MUST_READ_IF_MODIFIED,IOobject::AUTO_W
 ^
exGMRES.C:127:31: error: ‘fvSolution’ was not declared in this scope
 dictionary& mySubDictUpdate = fvSolution.subDict("p");
                               ^
exGMRES.C:137:1: error: ‘solutionDict’ was not declared in this scope
 solutionDict.regIOobject::write();
 ^
exGMRES.C:137:14: error: ‘regIOobject’ has not been declared
 solutionDict.regIOobject::write();

[Tobi]

You have to include the corresponding header files in order to give the class information to the compiler. Otherwise it will not work.

[klausb]

Hi, I am getting nowhere with this.

I went through pages like this: http://openfoamwiki.net/index.php/In...IOobject_class, looked at applications using the functionality, ...

but I can't get any Input/Output functionality to work I still get stuck with missing declarations and incorrect file references in header files all the time so nothing compiles.

Is there any complete example in the best case related to a solver?