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How to scale the ABL velocity profile?

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Old   November 19, 2017, 06:39
Default How to scale the ABL velocity profile?
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Ahmed Hassan
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Hello all,

I am modelling the flow around a lowrise building. I use the ABL and I have been using 1:1 scale since I started. However, I would like now to reduce my model to a 1:100 scale and I should reduce my ABL logaritmic velocity profile as a consequence.

However, since it is not a linear velocity profile, maybe the reduction could not be exactly proportional. I mean, if I used Zref=10 and Uref=10, maybe the reduction wouldn't be Zref=0.1 and Uref=0.1, but Uref=0.08, or something like that, since it is a logaritmic profile instead of a linear profile.

I know that the easier way would be to use linear reduction and forgeting about it. But I would like to do a good work.

I hope you could provide me some information about it.

Thanks in advance.
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Old   November 19, 2017, 06:47
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Filippo Maria Denaro
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Why don't you start using the velocity profile law in non-dimensional form? Then you can get any scaling you want using your physical quantities.
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abl, scale, velocity profile

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