2 Replies Latest reply on Nov 20, 2016 4:05 PM by Bill McEachern

External Flow, 1:100 scales, Wind Velocities verification.

Bill Dukes Nov 17, 2016 4:02 PM

I am trying to do an external flow simulation on a large area. The area is too large for Solidworks “modeling limits” so I had to make the models to a 1:100 scale. On a full scale version of the model I am wanting a 30 mph wind speed. What would I require on the (1:100) scale version? The main goal here is to explore the wind reduction created by a porous media WindFence (windscreen.) The gas would be “AIR”. It has been a long time since I messed with similarity laws and any help would be appreciated. \

Re: External Flow, 1:100 scales, Wind Velocities verification.

David Woodruff Nov 20, 2016 12:59 PM (in response to Bill Dukes)

Bill, it is the Reynolds number thingy.
Similarity Parameters
Looks like you will need 3000 mph [not good] or 100 times the density.
Coarse basic mesh with a fine local mesh in the region of interest doesn't work? How large is too large? Just curious.
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Re: External Flow, 1:100 scales, Wind Velocities verification.

Bill McEachern Nov 20, 2016 4:05 PM (in response to Bill Dukes)

Flow sim turbulence model start to diverge at an R'number of about 6-8 million Well at least for flow over a sphere/cylinder. The modelling of planetary B'layers is a field on its own and the whole model would be within the planetary B'layer. What r u trying to figure out how persistent the effect of the fence is? Why do you need a model something so large?
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