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my code is get steady but after that is oscillate

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Old   October 1, 2012, 08:30
Default my code is get steady but after that is oscillate
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Hassan Nemati
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Hi
I am running DNS code in a pipe with variable density with constant heat flux. I run the code and it gets steady and the velocity and shear stress is constant for a long time but after that it start to oscillate.
is anybody here to help me in this issue?
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Old   October 2, 2012, 06:01
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Alex
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Do you expect your flow to be laminar or turbulent?
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Old   October 2, 2012, 06:04
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Hi,
Laminar.
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