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Along with prospective fashion of solving the engineering-tasks (if development would allow us a such approach while answering the technology-questions of some project in future), goes alternatively corrective performance of those engineering tools, used to compensate for needed changes in some already existing technical solution. A unique chance to compare the needs of traffic-intentions (while setting the modern road communications through the southern of Bosnia and Herzegovina) verses natural occurrences in the atmosphere (such is a strong north-wind in this geographic region) offers the high-way-section Pocitelj-Zvirovici. Exactly in such cases (and before the actual construction of an engineering-construction is realized) "for the sake" of prospective-and certainly self-sustainable engineering-the tool of CFD (the tool for performing the Computational Fluid Dynamics) was applied to engaged the problem. Again, in the same moment while solving prospectively (through application of the CFD-based research prospectively in) several technical issues on submarine tidal-turbines in bay-area of Swansea in Wales (UK) for electricity production, a corrective way of engineering is requested to research on both imagined fire-scenarion in road-tunnel of Vranduk, close to Zenica (Bosnia) as as well as in case of investigative observing the (large-scale) combustion of the flare-stack in the refinery in town of Lendava (Slovenia). Coming from the both steady-state (k-epsilon turbulence-treatment) and time-dependent applied CFD-based explorations (Large-Eddy Simulation in Smagorinsky-Lilly mode), the unexpected and unwanted strong gaseous flows were detected and the results coming out of this are explained and discussed.