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August 7, 2013, 19:15 |
ineffective wall roughness
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#1 |
Senior Member
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Hi experts.
I'm simulating a weir. I want to know the effect of roughness of weir on velocity. I've done mesh sensitivity analysis and I checked various values of roughness but nothing has been changed. does anyone know where the problem is? any help would be appreciated. |
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August 8, 2013, 08:01 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,697
Rep Power: 143 |
Maybe roughness does not significantly influence your flow?
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August 10, 2013, 10:15 |
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#3 |
Senior Member
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August 10, 2013, 12:07 |
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#4 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
How do you specify the roughness parameter in your simulation?
Is it part of the wall boundary condition or do you have a geometrical roughness? What about the rest of your setup? Be descriptive! |
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August 10, 2013, 21:34 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,697
Rep Power: 143 |
Let me state my point a different way. If a hurricane was heading your way, do you think putting a piece of sand paper on the ground would make a difference? What about if you put a piece of sand paper on the ground which had double the surface roughness?
Obviously a hurricane is so big it does not matter what you do, the hurricane is going to progress unaffected. So my point is that if the surface roughness does not significantly affect the flow then it does not matter what surface roughness you use you will still get the same result. |
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August 14, 2013, 17:27 |
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#6 |
Senior Member
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thank you all for your replays.
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August 14, 2013, 17:30 |
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#7 |
Senior Member
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