The similarity requirements for wind tunnel model studies of gas diffusion

The similarity requirements for wind tunnel model studies of buoyant and heavy gases diffusion near buildings are presented and discussed. Exact similarity of buoyant and heavy gases behavior requires explicit scaling of the released gas density and equality of the model and full scale Froude number...

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Bibliographic Details
Published inNihon Kaze Kougakkaishi Vol. 1994; no. 59; pp. 23 - 28
Main Authors Mochida, Akashi, Murakami, Shuzo, Kato, Shinsuke
Format Journal Article
LanguageEnglish
Published Japan Association for Wind Engineering 1994
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Summary:The similarity requirements for wind tunnel model studies of buoyant and heavy gases diffusion near buildings are presented and discussed. Exact similarity of buoyant and heavy gases behavior requires explicit scaling of the released gas density and equality of the model and full scale Froude numbers. The latter requirement leads to very low wind speeds for wind tunnel tests when small scale models are used. This condition makes the physical modeling of flow and diffusion fields complicated and thus reliable wind tunnel operation becomes very difficult. Approximate modelling methods, which relax the requirement of gas density scaling in order to operate at higher wind tunnel speeds, are also examined.
ISSN:0912-1935
1883-8413
DOI:10.5359/jawe.1994.59_23