Prediction and elimination of severe slugging flow in offshore platform riser system are the two issues concerned by marine engineering design companies and related products manufacturers. This paper introduced the occurrence and harm of severe slugging flows in the riser system of offshore platform. An OpenFOAM-based software developed by Newcastle University was introduced for predictions of severe slugging period in subsea pipeline-riser system. The availability and reliability of the software were validated by previous experimental investigations. Using the software, different pipe downward angles and riser heights were found to have noticeable impacts on severe slugging periods. Comparatively, the effects of riser heights were found to be more considerable. Such conclusions provided some useful basis for future pipeline-riser system designs, installation and inspection.%海洋平台组合立管系统严重段塞流的预报和消除是海工设计研发单位及相关产品制造商关注的问题之一。论文对海洋平台立管系统严重段塞流的发生和危害进行了介绍。着重介绍一款近期由英国纽卡斯尔大学基于开源平台 OpenFOAM开发的立管段塞流预报工具，并依据经典试验数据对其可靠性进行了验证。借助该软件对设计的不同组合立管中严重段塞流发生的周期进行了探讨。数值计算表明，立管底部下倾角及立管高度对严重段塞流的影响显著，而立管高度变化对段塞流周期的影响尤为明显。这些研究成果将对立管系统的设计、安装以及检验可提供一定的参考。
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