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-   -   Hydraulic Diameter or Length Scale (http://www.cfd-online.com/Forums/fluent/33936-hydraulic-diameter-length-scale.html)

Bob June 11, 2004 09:43

Hydraulic Diameter or Length Scale
 
I am simulating a 3D gas turbine combustor. What would be the best to use length scale or hydraulic diameter. My first run will be non-reacting. Also, if I use length scale would I choose the height or the width of the outlet. Or maybe it would be better to use the viscosity ratio. Most of the tutorials are 2D and with 3D this issue has always been confusing to me. Any help will be appreciated.

Tom June 11, 2004 09:49

Re: Hydraulic Diameter or Length Scale
 
I would use Hydraulic Diameter and take the diameter as that of the outlet/inlet.

Bob June 11, 2004 10:56

Re: Hydraulic Diameter or Length Scale
 
Now, would I use the height of the outlet or the length?

martin June 17, 2004 09:13

Re: Hydraulic Diameter or Length Scale
 
In Fluent there is a simple relation between length scale and characteristic dimension (diameter): l=0.07*L


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