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Taking the absolute value of a volVectorField or a volTensorField

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Old   September 16, 2005, 05:24
Default Hi, I wish to compute the abs
Marco Kupiainen
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I wish to compute the absolute value of a volVectorField gp componentwise. I have tried to loop over all cells:
forAll(centres, celli)
if ( gp[celli].x() < 0.0 )
gp[celli].x() = -gp[celli].x();
if ( gp[celli].y() < 0.0 )
gp[celli].y() = -gp[celli].y();
if ( gp[celli].z() < 0.0 )
gp[celli].z() = -gp[celli].z();

but when I take min(gp) it shows negative values. How does this work? What should I do instead?
best regards
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Old   September 16, 2005, 07:22
Default Should be: volVectorField g
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Hrvoje Jasak
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Should be:

volVectorField gpCmptMag = cmptMag(gp);

but it is not instantiated because it's not really appropriate for geometric fields. How about:

vectorField gpCmptMag = cmptMag(gp.internalField());

This gives you the internal part of the field.

Hrvoje Jasak
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