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INFLUENCE OF BOUNDARY CONDITIONS UNCERTAINTIES ON THE SIMULATION OF VENTILATED ENCLOSURES

The aim of this study is the assessment of the effect of input data uncertainties on the predictions achieved for a ventilated room by means of a computational fluid dynamics (CFD) technique. We first describe the characteristics of the model (experimental setup and numerical approach). This is followed by a review of sensitivity and uncertainty analysis methods in order to choose the most appropriate one. Taking into account the numerical model particularities, a differentiation analysis with finite differences is applied. The methodology is based on an automatic generation of the perturbation size imposed on the inputs. Experimental-numerical confrontations concerning the uncertainty domains are given for air mean velocity and temperature within the enclosure, as well as for room wall heat transfer calculations.