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T-S wave and Kelvin-Helmholtz// turbulence model |
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January 23, 2021, 13:05 |
T-S wave and Kelvin-Helmholtz// turbulence model
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#1 |
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Yusuf Elbadry
Join Date: Sep 2018
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Dear All,
I am doing literature review about low Reynolds number flows, and while reading, I found some research papers speaks about Tollmien–Schlichting wave and some speaks about Kelvin-Helmholtz instability. Is there any relation between them? If a very low Reynolds number flow ( 4000 for example ) is being simulated over airfoil, probably a laminar separation bubble will take place and a turbulent wake will exist. do I have to include a turbulence model ? Thanks in advance. Last edited by AeroSonic; January 23, 2021 at 15:41. |
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January 24, 2021, 06:52 |
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#2 |
Member
Yusuf Elbadry
Join Date: Sep 2018
Posts: 65
Rep Power: 7 |
Can anyone help, please
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January 24, 2021, 07:13 |
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#3 |
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Filippo Maria Denaro
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At such a Re the flow would be laminar along the airfoil. I doubt you have a separation bubble
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January 24, 2021, 08:49 |
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#4 | |
Member
Yusuf Elbadry
Join Date: Sep 2018
Posts: 65
Rep Power: 7 |
Quote:
how do I know decide the type of the instability, is it K-H instability of T-S instability |
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January 24, 2021, 08:56 |
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#5 |
Senior Member
Filippo Maria Denaro
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What you are talking about at high angle of attack is a geometria separation, nothing to do with the classic fluid dynamics instability
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January 24, 2021, 09:04 |
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#6 |
Member
Yusuf Elbadry
Join Date: Sep 2018
Posts: 65
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I already tried simulating 0012 airfoil at different Reynolds number such as 4000,5000,6000 and an angle of attack of 5 and 6. I tried a flow control method and different laminar separation bubble were bursting. Also, a laminar separation bubble was formed in the rigid case.
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January 27, 2021, 15:54 |
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#7 |
Member
Yusuf Elbadry
Join Date: Sep 2018
Posts: 65
Rep Power: 7 |
Can anyone help, please
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