Electronic Journal of Differential Equations, Vol. 2025 (2025), No. 23, pp. 1-18. Title: Local solutions for a Brinkman equation coupled with heat-convective and concentration-diffusive equations and a volumetric mass source Author: Hakho Hong (State Academy of Sciences, Pyongyang, DPR Korea) Abstract: In this article, we consider a model coupled with the Brinkman heat-convective and concentration-diffusive equations for a mixed gas flow in a porous media. The specificity of this model lies in the presence of a volumetric mass source depending on temperature and concentration in mass balance equation. We will prove the existence and uniqueness of the smooth local solutions for the 3-D Cauchy problem. As a byproduct, we show the convergence of the approximate solutions based on an iteration scheme. Submitted September 30, 2024. Published March 03, 2025. Math Subject Classifications: 35B40, 35B65, 35L65, 76N05, 76N10, 76T10. Key Words: Brinkman equation; heat-convective equation; mixed model; concentration-diffusive equation; existence; uniqueness; iteration scheme.