Johannes Müller, SFB 1313 doctoral researcher at the Institute of Aerospace Thermodynamics (ITLR) (research project A02), will give his milestone presentation "Interface resolved pore-scale simulations" on 29 April 2021 at 3 pm CET.
Date: Thursday, 29 April 2021
Time: 3 pm CET
Title: "Interface resolved pore-scale simulations"
Place: online presentation >>> If you are interested in participating in the lecture, please contact simon.emmert@iws.uni-stuttgart.de
Abstract
Free flow pore flow systems occur in a variety of technical and natural systems. They are characterized by a free fluid flowing over a porous media. The pore geometry of the porous media plays a critical role for heat and mass transfer between the free flow and the pore flow. In this talk, interface resolved pore-scale simulations are presented which resolve the flow in idealized pore structures. For a turbulent single-phase flow, a wall-resolved Large Eddy Simulation (LES) is resented and the influence of the free flow Reynolds number and the porosity is discussed. Regarding the momentum exchange the, Reynolds stress components as well as the slip and transpiration velocities are analyzed and compared to Particle Image Velocimetry (PIV) measurements. These findings are then put into the context of the Beavers Joseph coupling condition which is used by model concepts on the larger Representative Elementary Volume (REV)-scale for the tangential shear at a sharp interface. For the simulation of multiphase systems with the Volume of Fluid Method (VOF), the modelling of the moving three-phase contact line with the help of dynamic contact angle models is discussed. Finally, it is shown that preferential flow paths in the pore space can lead to a Local Thermodynamic Non-Equilibrium (LTNE) due to an enhanced convective heat transfer.