Conference Paper
Proceedings of Building Simulation 2013: 13th Conference of IBPSA
On The Conservation Of Mass And Energy In Hygrothermal Numerical Simulation With Comsol Multiphysics
On The Conservation Of Mass And Energy In Hygrothermal Numerical Simulation With Comsol Multiphysics
Michele BIANCHI JANETTI, Fabian OCHSDOI: https://doi.org/10.26868/25222708.2013.1267Abstract: In this paper, two different forms of the non-linear PDE-system for heat and mass transfer in porous materials and their implementation with COMSOL Multiphysics are considered. The φ-based form presents the relative humidity as system variable and leads in general to nonconservative solutions. The u-based form uses the water content as variable and is conservative. This study aims to select the most appropriated form for the implementation of the heat and mass transfer problem in COMSOL Multiphysics, comparing the quality of the numerical solutions and the solver performances. As first test-example, the simulation of a onedimensional porous layer with a moisture flux imposed on one of the boundaries is presented.As second example, the moisture redistribution inside a partially saturated layer is simulated. Pages: 2860 - 2867 Paper: