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Save velocity on a line for every timestep

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Old   March 24, 2012, 10:52
Default Save velocity on a line for every timestep
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HJ
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Hi all,
I want to save velocity on a line for every timestep. But it seems udf cannot do that because line has no ID as surfaces. I want to study the cross-spectrum of the velocity on the line, so can anyone enlighten me how this can work?

Many thanks
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