A URANS CFD-based study has been undertaken to investigate scale effect in container ship squat. Initially, CFD studies were carried out for the model scale benchmarking squat cases of a self-propelled DTC container ship. Propulsion of the vessel was modelled by the body-force actuator disc method. Full scale investigations were then undertaken. Validation of the full scale set-up was demonstrated by computing the full scale bare hull resistance in deep, laterally unrestricted water and comparing against the extrapolated resistance of model scale benchmark resistance data. Upon validating the setup, it was used to predict full scale ship squat in confined waters. The credibility of the full scale confined water model was checked by comparing vessel resistance in confined water against the Landweber (1933) empirical prediction. To quantify scale effect in ship squat predicitons, the benchmarking squat cases were computed by adopting the validated full scale CFD model with body-force propulsion. Comparison between the full scale CFD, model scale CFD and model scale benchmark EFD squat results demonstrates that scale effect is negligible. In addition, model scale predicted ship squat results were compared with physical full scale squat measurements of similar hulls. The two series of results are in good agreement which also demonstrate that the scale effect is insignificant.

中文翻译：

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自航集装箱船下蹲尺度效应数值研究

已经开展了一项基于 URANS CFD 的研究，以调查集装箱船下蹲的规模效应。最初，CFD 研究是针对自航式 DTC 集装箱船的模型比例基准蹲下案例进行的。船舶的推进是通过体力致动器盘法建模的。随后进行了全面调查。通过计算深水、横向无限制水中的全尺寸裸船体阻力并与模型比例基准阻力数据的外推阻力进行比较，证明了全尺寸设置的验证。在验证设置后，它被用于预测在受限水域中的全尺寸船舶蹲坐。通过将承压水中的船舶阻力与 Landweber (1933) 的经验预测进行比较，来检查全尺寸承压水模型的可信度。为了量化船舶后坐预测中的尺度效应，采用经过验证的全尺寸 CFD 模型和体力推进计算基准下蹲案例。全比例 CFD、模型比例 CFD 和模型比例基准 EFD 深蹲结果之间的比较表明，比例效应可以忽略不计。此外，模型比例预测的船舶下沉结果与类似船体的物理全尺寸下沉测量结果进行了比较。两组结果吻合较好，也说明尺度效应不显着。此外，模型比例预测的船舶下沉结果与类似船体的物理全尺寸下沉测量结果进行了比较。两组结果吻合较好，也说明尺度效应不显着。此外，模型比例预测的船舶下沉结果与类似船体的物理全尺寸下沉测量结果进行了比较。两组结果吻合较好，也说明尺度效应不显着。