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Old   July 1, 2009, 10:12
Default Question about field defintion
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Antonio Martins
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I have a question concerning the definition of fields, either vectorial or tensorial, for CFD calculations. In
particular, during my calculations I have to calculate the gradient of velocity field, by defintion a volVectorField,
using the formula

DU = fvc :: grad (U);

Both DU and U are defined in the file createFields.H, in the following form

// Reading the velocity field

Info<< "Reading field U\n" << endl;
volVectorField U

Info<< "Creating Velocity Gradient Tensorial Field\n" << endl;
volTensorField DU

This way, I ensure that in each mesh point I calculate correctly DU, right?

Other form could be doing the following

volTensorField DU = fvc :: grad ( U() );

I believe the first form is correct, although the second may work. Can anybody help me out?


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Old   July 6, 2009, 06:39
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Henrik Rusche
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Dear Titio,

Both forms are possible and the second will work if you delete the brackets on U.

volTensorField DU = fvc::grad (U);

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