CFD Online Discussion Forums - Writing/output of simple data into an ASCII-File

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Hello,
What I'd like to do is something a bit different.

I am implementing a new BC which is used by a certain volScalarField A.
This newBC calculates the values on the same patch of another volScalarField named B.
The B field is recalled inside the BC as

Code:

volScalarField B = this->db().lookupObject<volScalarField>("B");    

   fvPatchScalarField  Bs = B.boundaryField()[patchIndex];

Then (still inside the BC)

Code:

forAll (something, j) 

{

Bs[j]= .....bla bla bla

}

Both A and B are initialized in the createFields.H as:

Code:

volScalarField A

    (

        IOobject

        (

            "A",

            runTime.timeName(),

            mesh,

            IOobject::MUST_READ_IF_MODIFIED,

            IOobject::AUTO_WRITE

        ),

        mesh,

        dimensionedScalar("A",dimensionSet(1, 2, -3, 0, 0, -1, 0),0)

    );

My problem is that I don't know exactly how to extract the values of Bs and write them at each time step as BC for B. In the last section of my BC

Code:

void Foam::newBC::write(Ostream& os) const

I tried something like

Code:

writeEntry("Bs", os);

but of course it writes those values inside the patch of A where the BC is used.

Shall I have to code a different BC for B? If so how do I store those Bs value from my newBC of A? (because write now as soon as I get out of the newBC they are removed)
Any ideas?

(sorry for being messy)
Thx

Hi Minisasi,

Can you try something like this ?

Code:

    if (dimensionedInternalField().mesh().time().outputTime())

    {

       B.write();

    }

Hope it helps !!

Hi,

Thank you for your reply, but unfortunately it didn't work.:(

I tried to follow what they previously wrote couple of posts ago, and I wrote inside my newBC (for A)

Code:

fileName testFile("TEST.txt");

OFstream os(db().time().constant()/testFile);

os << "This is the first line in the file.\n";

os << B.boundaryField()[patchIndex].size();

os << endl



 forAll (something, j)

{

Bs[j]...... bla bla bla;

    os<< Bs[j];

    os << endl;

}

This kinda work, in the sense that it writes out in the /constant folder a .txt file with all the Bs values I wanted. The point is that I need those values inside the B boundary file.

Any hints?

increasing writing precision

Dear Former,

In my OpenFOAM code, I defined a variable to trace my flame front position. So, in my log file the x position of that variable will be reported (component (0)). It works fine, but my problem is I can not increase the writing precision of this value! For example, in my running log file, I have Time = 0.000000240, max flametip = 71.9713, but I want my flametip have more accuracy!
I will apperaciate any suggestion and help.
To bear in mind, in my control dict, I put writePrecision 9; , timePrecision 9; and writeFormat ascii;

Best Regards,
Reza

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