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首页> 外文期刊>Ocean Engineering >CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves
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CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves

机译：CFD验证和验证KVLCC2在短和长头波中具有固定和自由电涌的附加阻力和运动

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摘要

The motions and added resistance of KVLCC2 at Fr=0.142 and 0.25 with free and fixed surge in short and long head waves are predicted using URANS and validated against EFD datafor Fr=0.142. Verification studies show the results are fairly insensitive to the grid size and time step. CFD indicates no significant difference between free and fixed surge while EFD pitch motion and added resistance are affected. Added resistance was largest when the bow relative motion has largest amplitude and is about 180° out of phase with the waves. The decomposition of forces and moments works well for first harmonics but not for higher harmonics originated from radiation in long waves and diffraction in very short waves. Maximum responses occur near the resonance condition and near the maximum wave excitation force which is at λ/L=1.33 and long waves for surge/pitch and heave, respectively. Potential flow predictions for motions and the added resistance are further from the data than CFD. Local flow analyses show that added resistance is mainly induced by high pressure on the upper bow which is correlated with bow relative motion. The unsteady wave pattern is analyzed and the wake flow is compared with PIV measurements.
机译：使用URANS预测了KVLCC2在Fr = 0.142和0.25时的运动和附加阻力（短和长头波中的自由和固定浪涌），并针对Fr = 0.142的EFD数据进行了验证。验证研究表明，结果对网格大小和时间步长不敏感。 CFD表示自由浪涌和固定浪涌之间无明显差异，而EFD俯仰运动和附加阻力会受到影响。当船首相对运动具有最大振幅并且与波浪异相约180°时，附加阻力最大。对于一次谐波，力和力矩的分解效果很好，但对于长波辐射和极短波衍射产生的高次谐波，效果不佳。最大响应出现在共振条件附近和最大波激发力（分别为λ/ L = 1.33）和长波（对于浪涌/俯仰和升沉）附近。与CFD相比，来自数据的潜在流动预测和附加阻力更远。局部流动分析表明，增加的阻力主要是由上弓的高压引起的，这与弓的相对运动有关。分析非稳态波型，并将尾流与PIV测量值进行比较。

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  • 来源
    《Ocean Engineering》 |2013年第1期|240-273|共34页
  • 作者

    Hamid Sadat-Hosseini; Ping-Chen Wu; Pablo M. Carrica; Ho Kim; Yasuyuki Toda; Frederick Stern;

  • 作者单位

    IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA;

    Department of Naval Architecture & Ocean Engineering, Osaka University, Osaka, Japan;

    IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA;

    Department of Naval Architecture & Ocean Engineering, Osaka University, Osaka, Japan;

    Department of Naval Architecture & Ocean Engineering, Osaka University, Osaka, Japan;

    IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    CFD; EFD; potential flow; added resistance; head waves;

    机译：差价合约EFD;势流增加阻力;头波;

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