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Back directed vectors in PHRS tube simulation results

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Old   April 19, 2016, 15:41
Default Back directed vectors in PHRS tube simulation results
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Hello, I did simulation of steam flow in tube and in results for velocity vectors I have some back directed vectors, has anyone got such results? is it a true result? if yes tell me please the theory of it, why back directed vectors arises?
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Old   April 19, 2016, 18:30
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That would be a separation. https://en.wikipedia.org/wiki/Flow_separation
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