Die Entwicklung eines praxisorientierten Ansatzes zur Brandherdmodellierung mit Star-CCM+ im Rahmen von Problemen des Brandschutzingenieurwesens durch Vergleiche von Simulationsergebnissen mit experimentellen Messungen

Abstract

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This bachelor thesis investigates the CFD (Computational Fluid Dynamics)-program Star-CCM+ on the feasibility of fire source modelling and for relevance and efficiency for the daily project business. Thereby two real fire tests are simulated. The first is an experiment by Bernard J. McCaffrey, who analysed the effects of purely buoyant diffusion flames. The second test is a fire test by the MFPA Leipzig, which took place in a box-shaped building and, amongst others, researched the interplay of the flame with the flow rate and the temperatures of the inlet and outlet air. The McCaffrey test conduces to find the ideal adjustment for realistic results. These realisations are used for the simulation of the MFPA Leipzig experiment. A volumetric heat source and two combustion models, EBU (Eddy Break-Up) and PPDF (Presumed Probability Density Function), are used and diversified. For the combustion models a mass flow controls the inlet of the fuel. The results show in the area above the flame slightly higher values of temperature with the volumetric heat source, even though the heat release rate is reduced on the proportion of radiation of about twenty percent. On greater heights the flow rate differs more. The combustion models show greater variations of the temperature, especially near the flame, which are much higher than aspired. The flow rate is higher as well. The results of the MFPA Leipzig simulations show good accordance with the temperatures, even though they are higher near the ceiling and chimneys and lower near the ground. Only the flow speeds show extensive aberrances. As a summary, good conformity of the simulations can be attested, although some areas show aberrances because of the required simplifications of the simulations.