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The city of Patras in Greece has a highway system incorporating tunnel pairs across hills. BG Consulting Engineers were examining safety scenarios if an accidental fire began in one tunnel and the smoke recirculated in the other. Renuda won a competitive tender to simulate and evaluate the outflow and inflow for three different hills and scenarios. Renuda also performed simulations for three configurations: without a separating wall to reduce smoke ingestion, with a partial wall and with a full wall. The CFD simulations provided detailed qualitative and quantitative information on the smoke dispersion.