Iterative Substructuring Methods for Indoor Air Flow Simulation

The numerical simulation of turbulent indoor-air flows is performed using iterative substructuring methods. We present a framework for coupling eddyviscosity turbulence models based on the non-stationary, incompressible, nonisothermal Navier-Stokes problem with non-isothermal near-wall models; this approach covers the k/ǫ model with an improved wall function concept. The iterative process requires the fast solution of linearized Navier-Stokes problems and of advection-diffusion-reaction problems. These subproblems are discretized using stabilized FEM together with a shock-capturing technique. For the linearized problems we apply an iterative substructuring technique which couples the subdomain problems via Robin-type transmission conditions. The method is applied to a benchmark problem, including comparison with experimental data by Tian and Karayiannis [2000] and to realistic ventilation problems.