Parallel solver for unsteady, turbulent incompressible flows enhanced with heat and mass transfer/buoyancy effects.
Numerical method characteristics
Flow and heat transfer equations are solved strongly coupled.
It is based on the pseudocompressibility concept for the solution of steady/unsteady, 2D/3D, turbulent flows
It uses hybrid unstructured meshes.
Dual time stepping: Second order three point backward scheme in physical time, first order backward Euler implicit scheme in pseudotime. Local time stepping in pseudotime for convergence acceleration.
Upwind scheme for inviscid fluxes (second or third order accurate for mean flow and first order accurate for turbulence model)
Central scheme for viscous fluxes (second order accurate)
Numerical surface mesh
Visibility evolution
Synchronized fire-crowd simulations (in cooperation with SIMPLAN AG, Hanau)
Turbulence Models
Standard k-ε turbulence model
k-ω SST
k-ω ΤΝΤ
k-ε MMK
Large Eddy Simulation (LES)
Implementation
Parallel CFD code based on the MPI protocol (MPICH2 and OpenMPI 64 bit implementations). The Single Program Multiple Data (SPMD) approach has been adopted. Mesh partitioning in subdomains is required to assign each processor/node a subdomain.
Applied on hybrid unstructured meshes.
Radiation model based on Finite Volume Method.
Contaminant concentration field (soot, combustion products).
Fire suppression by sprinklers (Lagrangian treatment and droplets’ tracing).
Simulation of HVAC systems.
1D simplified heat conduction through walls coupled with the CFD simulation.
Simulation of fire events in tunnels - Backlayering effect
Mixing cooling in an amphitheater
Thermal comfort and HVAC performance
New Capabilities
Model generation from IFC (IFC4) files. Recognition of spaces, simplification of geometry and imposition of boundary conditions.
Advanced Finite Volume model for heat radiation
Heat Release Rate Properties of different materials
Implementation of dynamic geometrical elements
Incorporation of HVAC and BACS
Modelling of active and passive fire protection systems
Modeling of toxic gas dispersion considering additional buoyancy effects
Coupling with crowd simulation application for evaluating evacuation strategies via a TCP/IP communication model
Participation of smoke in the modeling of thermal radiation
Material library with suitable properties
Fire spread on the lining and the furniture.
Evaluation of the results according to human safety criteria. Definition of suitable metrics/KPIs
Numerical surface mesh
Streamlines, pressure distribution on buildings surfaces
