Specifying hydraulic diameter in 2D

blxtack34 · November 12, 2024, 18:45

Hi, this is definitely a stupid question but I don't know how to determine hydraulic diameter whilst working in 2D ie with the geometry modelled as a surface.

I'm modelling an ellipse in a rectangular domain (meant to simulate an external flow). The only value I have to work out HD is inlet height.
In the worksheets I'm using, they use intensity & hydraulic diameter as the turbulence parameters but I have no idea how they got their HD value.

For reference, they had inlet height 20m & their HD is 1.306m, the bluff body has length 0.6096.

xisluke · November 14, 2024, 10:07

Hydraulic diameter is meant to be used mainly for internal flows, in your case it would be better to evaluate the turbulence parameters through turbulent viscosity ratio.

https://www.simscale.com/forum/t/def...nditions/80895

Here you can find some infos.

November 12, 2024, 18:45	Specifying hydraulic diameter in 2D	#1
blxtack34 New Member Jen Join Date: Nov 2024 Posts: 1 Rep Power: 0	Hi, this is definitely a stupid question but I don't know how to determine hydraulic diameter whilst working in 2D ie with the geometry modelled as a surface. I'm modelling an ellipse in a rectangular domain (meant to simulate an external flow). The only value I have to work out HD is inlet height. In the worksheets I'm using, they use intensity & hydraulic diameter as the turbulence parameters but I have no idea how they got their HD value. For reference, they had inlet height 20m & their HD is 1.306m, the bluff body has length 0.6096.

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November 14, 2024, 10:07		#2
xisluke Member Luca Join Date: Mar 2021 Location: Italy Posts: 56 Rep Power: 5	Hydraulic diameter is meant to be used mainly for internal flows, in your case it would be better to evaluate the turbulence parameters through turbulent viscosity ratio. https://www.simscale.com/forum/t/def...nditions/80895 Here you can find some infos.