CFD Online Discussion Forums - Howto create runtime variable for internal field

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Howto create runtime variable for internal field

Hello everyone. Assume that I have a variable like this:

http://i.imgur.com/of7Dlmr.gif

And I want to change DT respect to T after every iteration and it should be like this, I need to get the value of that cell and evaluate DT equation, use it for iterations and write it to time folder and update it at next iteration step.

So I define it like this:

Code:

dimensionedScalar a (laminarTransport.lookup("a"));

dimensionedScalar b (laminarTransport.lookup("b"));

volScalarField DT = a*T+b

I compile it and run, everything seems okay but when I look into time folder, lets say 10, I can't get the value for each cell. Instead, it says for internal uniform 100, for instance but I want to see the distribution of DT inside the domain.

The way I am trying to calculate DT is not appropriate way? If not, call you tell me how can I define this kind of variable, please?

I hope you can help me to find my mistake!
Regards

Hi,

You have to initialise your volScalarField with IOobject as follows:

Code:

volScalarField DT

(

    IOobject

    (

        "DT",

        runTime.timeName(),

        mesh,

        IOobject::NO_READ,

        IOobject::AUTO_WRITE

    ),

    a*T + b

);

Hope this helps.

Cheers,
Ben