TY - JOUR A1 - Habib, Abdel Karim A1 - Schalau, Bernd A1 - Schmidt, Dirk T1 - Comparing tools of varying complexity for calculating the gas dispersion JF - Process safety and environmental protection N2 - When handling flammable and/or toxic liquids or gases, the gas dispersion following a release of substance is a scenario to be considered in the risk assessment to determine the lower flammability distance (LFD) and toxicity thresholds. In this work a comparison of different gas dispersion tools of varying complexity ranging from a simple Gaussian model over a boundary layer model (BLM) and a Lagrangian model to CFD (in this case ANSYS CFX v14) is presented. The BLM covers the special case of liquid releases with formation of a pool. It does not only solve the gas dispersion but also calculates the evaporating mass flow out of the pool. The simulation values are compared to each other and to experimental data resulting mainly from our own open air experiments covering the near field and carried out on the Test Site Technical Safety of BAM (BAM-TTS) for different release types (pool evaporation, gas release) and topologies. Other validation data were taken from literature and cover large scale experiments in the range of several 100 m. KW - Gas dispersion KW - Modeling KW - CFD KW - Hazard assessment KW - Gauss KW - Lagrange PY - 2014 DO - https://doi.org/10.1016/j.psep.2014.02.014 SN - 0957-5820 SN - 1744-3598 SP - 1 EP - 6(?) PB - Elsevier CY - Amsterdam AN - OPUS4-30529 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -