The presence of solid walls in many flow systems strongly influences the flow, heat and mass transfer in the adjacent fluid layer, especially when phase changes and chemical reactions take place. The development of relevant computational methods (including both theoretical models and numerical algorithmic approaches) and experimental techniques for model validation is driven primarily by the demands of engineering practice and advances in various application systems, which require a better understanding of the underlying multiscale and multiphysics near-wall processes. High-temperature materials synthesis and processing, engine heat transfer and combustion, chemical engineering (chemical vapour deposition and infiltration, catalytic processes, etc.) and boundary layer flames with relevance for fire safety are just a few representative examples. Accordingly, processes such as material deposition, film growth and etching, surface reactions and their coupling with chemically reacting flows, wall-flame interaction - all together with the presence of conjugated processes of heat and mass transfer - need to be addressed. This mini symposium aims to highlight some of the achievements made in this area. Since both the modelling approaches and the near wall validation measurements are challenging, the mini-symposium will help by providing the state of the art with respect to (a) reliable modelling approaches for the simulation of multiscale and multiphysics near wall processes in combustion systems, (b) appropriate experimental data required for comprehensive model validation, and (c) validation/uncertainty quantification issues for LES and relevant scale-resolving turbulence models in the near-wall region. The mini symposium will provide an opportunity for participants to present their latest results, and also to develop and initiate new collaborations in this field.