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CFD ANALYSIS OF 80YEAR OLD MODEL TESTS FOR TRANSATLANTIC LINERS

机译：跨大西洋衬里80年旧模型试验的CFD分析

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The two transatlantic liners “Bremen” and “Europa” built by different German ship yards in the 1920ies were reanalysed at HSVA using latest CFD tools. Rediscovering the old lines plans in the archives of Deutsches Schiffahrts Museum in Bremerhaven and at shipyard Blohm & Voss in Hamburg provided the basis for a challenging new project to prove the capabilities of the in-house RANS code FreSCo+ used to compare the performance of the two record holders in calm water and selected sea conditions. Bringing together the lines of the two “look alike” sister ships revealed for the first time the striking overall differences of the design concepts followed by the two builders at the time. Built to the same overall specifications and dimensions, it was obvious from old photographs that the bow sections and specifically the bulb varied in character .Comparing the full lines plans also indicates a significant difference in overall shape. In a first step, the present paper analyses calm water performance of both ships using different CFD prediction methods, potential flow as well as full RANS. As past reports also indicated rather different seakeeping behaviour of both vessels, RANS based motion predictions were performed for a set of significant North Atlantic waves too. These show differences in ship motions and added resistance. The CFD predictions performed shed further light onto the differences of the pioneering hull designs of the two transatlantic liners.
机译：在1920年代的不同德国船用船舶建造的两个跨大西洋衬里和“Europa”在HSVA使用最新的CFD工具进行了成绩。重新发现在布莱默汉·施维夫·博物馆的档案馆中的旧线路计划，在汉堡的船员Blohm＆Voss提供了一个具有挑战性的新项目的基础，以证明内部Rans代码壁画+用于比较两者的性能的内容纪录持有人在平静的水中和选定的海洋状况。汇集了这两条“看起来”的线条姐妹船首次揭示了设计概念的整体差异，然后是当时的两个建筑商。内置到相同的整体规格和尺寸，它是从老照片的船头部分，特别灯泡性格变化.Comparing全行计划明显也表明整体造型显著差异。在第一步中，本文分析了使用不同的CFD预测方法，潜在流量以及全rans的普通船舶的平静水性能。由于过去的报告还表明了两艘船舶的海保行为，因此对一系列重要的北大西洋浪潮进行了基于RAN的运动预测。这些显示船舶运动的差异和额外阻力。 CFD预测进一步轻，进一步轻，进一步光到两个跨性衬里的先驱船体设计的差异。

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