Local
Dynamic Similarity Model of Cross-Ventilation
Part 1 - Theoretical Framework
Takashi
Kurabuchi1, Masaaki Ohba2
Tomoyuki Endo3, Yoshihiko Akamine3, and Fumihiro
Nakayama1
1Tokyo
University of Science, 2Tokyo Polytechnic University, 3University
of Tokyo
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Abstract
A new model has been proposed
for evaluating the discharge coefficient and flow angle at an inflow opening for
cross-ventilation. This model is based on the fact that the cross-ventilation
flow structure in the vicinity of an inflow opening creates dynamic similarity
under the condition that the ratio of the cross-ventilation driving pressure to
the dynamic pressure of cross flow at the opening is consistent. It was
confirmed, from a wind tunnel experiment, that the proposed model can be applied
regardless of wind direction and opening position. Change of pressure along the
stream tube of a cross-ventilated flow was estimated from the results of Large
Eddy Simulation, and was set as the basis of model preparation. It was found
that the static pressure at the opening was exhausted by the flow’s
acceleration and by turbulent kinetic energy generation during this stage.
Key words:
cross-ventilation, large eddy simulation, wind tunnel experiment,
pressure loss coefficient, discharge coefficient.
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