BOULARD , Thierry

New constraints' for agricultural production also apply to protected cultivations'. A sustainable production of fruits, vegetables and ornamentals is now requested, with lower environmental impacts, particularly less energy, pesticides and mineral pollution and better production's quality. Exploring or revisiting the new climate-crop...

A combined greenhouse climate and crop model is crucial to predict the effect of global climate change on greenhouse production. Studying the consequences of climate change on crop production needs associating several sub-models dealing with: (i) greenhouse actuators control, (ii) greenhouse climate and (iii) tomato plant growth models.|We have...

Easily simulating inside climate conditions in the large insect screened Canary type greenhouses used intensively along the Moroccan coast is particularly important in enhancing this production system. We have therefore developed a global greenhouse climate model based on combined sensible and latent heat balances in which the ventilation flux...

This paper presents the results of the simulation of the temperature and air humidity distributions in a 960 m2 semi closed greenhouse with a tomato crop and equipped with fourteen air cooling and dehumidifying ducts. These units are distributed between the crop rows and the sucking inlets are alternately located at high or low locations. The...

This work aims at predicting CO2 concentration inside an experimental energy saving and semi closed greenhouse with a tomato crop. For that purpose, a 3D model of a cropped greenhouse has been created, including a discrete CO2 injection system and an air-cooling and dehumidifying system. The model has been developed using the Fluent CFD code....

For the 1990s computational Fluid Dynamics (CFD) has allowed significant progresses for modeling the greenhouse distributed climate, including at crop level. It chiefly relies on the dynamic action of the crop on air flow and the subsequent heat and mass exchanges. Thus, the CFD approach combined different scales of modeling: the greenhouse and...

Closed greenhouse systems allow micrometeorological conditions to be optimised for both energy saving and high quality yields. However, micrometeorological parameters need to be accurately monitored as a response to daily environmental conditions changes. A Computational Fluid Dynamics (CFD) model was developed to predict the distribution of...

This study aims to use Computational Fluid Dynamic (CFD) software to explore the distributed climate inside greenhouses and especially in the leaf boundary layer, natural habitat of plant pests. Knowing more precisely the climatic conditions prevailing at this level is a prerequisite to the control of the climate at this level in order to fight...

National audience

This study is principally based on predicting the consequences on the microclimate of changing greenhouse design. Several variations on the greenhouse design have been described and examined, i.e. the number of spans and gutter height. Climate investigations were based on numerical simulations using the CFD model and included the dynamic effect...

National audience

The increasing cost of electricity often drives the famers of the countries of the southern shore of the Mediterranean, to adopt the natural ventilation in order to provide greenhouse aeration. The roof and sidewall vents are opened to allow the excess heat to escape and cooler outside air to enter during daytime. During night time, these...

The environmental impact of greenhouse production in France is poorly documented. Environmental benefits versus drawbacks of greenhouse production are not well known. Assessments that intregrate pesticide toxicology and transfer of mass and energy are scarce. Here, we compared the main types of tomato production, heated, year-round production...

Frankliniella occidentalis (Pergande) is a key pest of various crops worldwide. In this study, we analyse the dependence of the infestation of this pest on spatially distributed micro climatic factors in a rose greenhouse. Despite the importance of this subject, the few existing studies have been realized in laboratory rather than in greenhouse...

The aim of this paper is to predict in details the distributed nocturnal climate inside a one hectare Moroccan canary type tomato-greenhouse equipped with continuous roof and sidewalls ventilation openings with fine insect screens, by means of 3D CFD (Computational Fluid Dynamics) simulations by using a commercial Software package CFD2000 based...