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October 29, 2014, 02:27
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Repeat in developing turbulent pipe
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#1 |
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Member
SAM
Join Date: Apr 2012
Posts: 74
Rep Power: 14  |
Dear all
this is an urgent situation. Please let me know you ideas. I am running a developing turbulnet pipe flow with the lenght of L=20D which D is the diameter. The inflow bc is taken form a periodic pipe (L=7.5) and feed in the developing pipe every time step. I just found out that the flow is repeating in developig flow. Do you know why? Thanks. |
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October 29, 2014, 03:47
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#2 |
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Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
what you see seems just produced by the periodic inflow velocity ... it seems that the inflow condition repeats periodically at a frequency such that you see vortical structures repeating....
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November 1, 2014, 16:33
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#3 | |
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Member
SAM
Join Date: Apr 2012
Posts: 74
Rep Power: 14 |
Quote:
Thank you very much for your kind reply. I think this simulation makes sense. We just feed in the fully developed flow and it repeats itself in developing pipe. I need to do some artificial perturbation in the inflow the break this periodicity. Now another question pop up. What should be this perturbation? Do you have any idea? |
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