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species transport-wavelike tail (mass fraction)

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Old   December 7, 2012, 10:45
Default species transport-wavelike tail (mass fraction)
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Dear all,

I am simulating the transport of contrast agent through a vessel and observed a strange phenomenon:
The species shows kind of a wavelike tail on the one side of the vessel (even though I consider a constant flow)(see picture: mass fraction of contrast agent is plotted in 3d for a plane of the vessel center). That means mass fraction of contrast agent is going up an down.The other side looks fine. I don't think it's a "real" effect...
Does anybody have an idea what this could be?
Thanks a million for any help and idea!
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