Effects of side vents and span numbers on wind-induced natural ventilation of a gothic multi-span greenhouse

Murat Kacira, Sadanori Sase, Limi Okushima

Research output: Contribution to journalReview article

40 Scopus citations


In this paper, the effects of wind speed, side ventilators and span numbers on gothic type multi-span greenhouse natural ventilation were studied by numerical simulation using the Computational Fluid Dynamics (CFD) approach. The realizable k-ε model was used for the turbulence model in the simulations. The results showed that the maximum greenhouse ventilation rate was achieved when both side and roof vents were used for ventilation. Without the existence of buoyancy effect in the computations, it was found that the ventilation rate increased linearly with the external wind speed in all the cases studied. The ratio of the opening of the ventilator area to the greenhouse floor area, 9.6%, was found to be small compared to the recommended ratios of 15-25%. The results showed that a significant reduction in ventilation rate was determined as the number of spans was increased and an exponential decay explained the relationship between the ventilation rate and the number of spans.

Original languageEnglish (US)
Pages (from-to)227-233
Number of pages7
JournalJapan Agricultural Research Quarterly
Issue number4
StatePublished - Oct 2004
Externally publishedYes



  • CFD
  • Greenhouse design
  • Optimization

ASJC Scopus subject areas

  • Biotechnology
  • Ecology
  • Animal Science and Zoology
  • Agronomy and Crop Science

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