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Stream tracer oriented lines in an unexpecting way

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Old   May 10, 2011, 09:45
Default Stream tracer oriented lines in an unexpecting way
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I have a sandstorm simulation (twoPhaseEulerFoam solver) with my inlet-outlet direcion on OX axis oriented and I don't know why the Stream tracer shows me the flow lines oriented on OZ axis...

I have a big box which contains 3 other little boxes (buildings). My inlet and outlet are walls belonging to the big box, all the other walls are simple wall

For both velocities (Ua and Ub) I have the followings values:

type fixedValue;
value uniform (0 0 0);
type zeroGradient;
type partialSlip;
valueFraction uniform 0;

I expect to see the sream lines oriented from negative X to positive X (axis).

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