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RE: [EnergyPlus_Support] Wind pressure coefficients
The DesignBuilder user interface is different in one important respect to
the direct EnergyPlus interface in that it requires wind pressure
coefficient data in directions relative to each surface (rather than for
each wind direction as required by EnergyPlus).
DesignBuilder subtracts the orientation of the surface from the each of the
0, 45, 90, 135, 180, 225, 270, 315° directions before sending the WPC data
to EnergyPlus. The advantage of doing it this way is that it allows
DesignBuilder to use the standard AIVC pressure coefficient data as
defaults. But it probably does not help when coming to calculate
coefficients using CFD for buildings having many different facade
orientations because it multiplies the number of CFD simulations required.
>What?s the meaning of the 45° increments for each
>value of Cp?
The 45° increments in DesignBuilder represent that different directions the
wind can take relative to the surface.
1. Yes
2. Yes
You may be interested to know that we will be finishing off the
DesignBuilder CFD calculations over the summer and these will in time
include an automated facility for calculating wind pressure coefficients
from CFD simulations.
David, please contact us directly for further guidance if your questions
apply specifically to DesignBuilder.
Andy Tindale
DesignBuilder Software
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of David Barrera
Sent: 14 March 2007 23:56
To: Grupo EPlus
Subject: [EnergyPlus_Support] Wind pressure coefficients
Dear all:
Actually this is for those users of Design Builder,
but I think it?s almost the same in E+.
There?s something I don?t get very well about the
?wind pressure coefficients?. In order to know Cp
values around the building I?m working with, I?ve done
CFD analysis. In my case, the predominant wind comes
from north; it means that wind that flows from north
to south is what I?ve simulated by CFD. Then I can
know pressure distribution around the building, and
the Cp values too.
What?s the meaning of the 45° increments for each
value of Cp?
1. I have to manipulate velocity vectors from CFD
results so I can know the angle of incidence to each
surface. Anyway, for some surfaces it could be
possible only one main angle (for example north
facade, in my building, which is affected mainly for
wind normal to it).
2. I have to simulate the entire building for
different inlets, each of one corresponding to the 0°,
45°. 90°, respect to the building?
I don?t know. I hope you can help me to clear my ideas
as soon as possible.
Thanks a lot.
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