Evaluation of mesh dependency of optical thickness in combined heat transfer problem with radiation and convection by OpenFOAM

Abstract

In a natural ventilation system of buildings, the radiation affects the convection due to the scale effect of convection region. To control the natural convection field using radiation, it is necessary to understand large-scale natural convection heat transfer phenomena in a building. The final objective of this study is to quantify the combined heat transfer of radiation and natural convection in a building using OpenFOAM. In order to achieve of the objective study, it is necessary to understand the accuracy of the radiation analysis library in OpenFOAM. In order to evaluate the reliability of this library, the dependence of the optical thickness per mesh of the coupled analysis method is evaluated.