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[fluent] Velocity vectors not normal to the boundary |
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April 20, 2016, 00:13 |
[fluent] Velocity vectors not normal to the boundary
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#1 |
New Member
shuk
Join Date: Feb 2016
Location: malaysia
Posts: 28
Rep Power: 10 |
hello all,
as in pictures attached, i wanted to created a rotating part (yellow) inside a cylinder. so when i input rotational velocity to the rotating part, the vector of velocity on the inlet started to swirl before it even reached the rotating part, arent the vectors suppose to be straight first and rotate when it reach the rotating part? |
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April 20, 2016, 00:15 |
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#2 |
New Member
shuk
Join Date: Feb 2016
Location: malaysia
Posts: 28
Rep Power: 10 |
when i give rotational velocity of the rotating zone to 0, the vector seems to travel straight
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April 20, 2016, 13:45 |
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#3 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,674
Rep Power: 66 |
Quote:
Navier-Stokes equations are elliptic, information (shear in this case) can propagate upstream. i.e. the downstream rotating fluid can drag the upstream fluid and also cause it to rotate. Laminar flows are dominated by momentum diffusion so this seems applicable. You can do some rough calculations to see if the shear stress is of the right order of magnitude. |
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April 21, 2016, 07:22 |
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#4 |
New Member
shuk
Join Date: Feb 2016
Location: malaysia
Posts: 28
Rep Power: 10 |
hi luckytran,
thanks for the explanation. btw could you have a look at my mesh file and tell me what i did wrong? |
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April 22, 2016, 04:16 |
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#5 |
New Member
shuk
Join Date: Feb 2016
Location: malaysia
Posts: 28
Rep Power: 10 |
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