Turn and zigzag maneuvers of a surface combatant using a URANS approach with dynamic overset grids
Turn and zigzag maneuvers of a surface combatant using a URANS approach with dynamic overset grids
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DOI：
10.1007/s00773-012-0196-8
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发表时间：
2013-06
影响因子：
2.6
通讯作者：
P. Carrica;F. Ismail;M. Hyman;S. Bhushan;F. Stern
中科院分区：
文献类型：
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作者：
P. Carrica;F. Ismail;M. Hyman;S. Bhushan;F. Stern
对某水面战斗机的标准机动进行了模型和全尺寸的非定常雷诺平均纳维尔-斯托克斯（URANS）计算。计算使用CFDShip-Iowa v4进行，CFDShip-Iowa v4是为自由和半捕获问题中的6DOF运动设计的自由表面求解器。重叠网格和层次机构允许舵偏转，而船舶经历6DOF运动。两种类型的机动进行了模拟：稳定转弯和曲折。对Fr = 0.25和0.41时采用恒RPM推进的35°舵偏和Z形20/20机动的稳定转弯的模拟与偏航、偏航率和滚转的实验时间历程以及轨迹进行了基准测试，并与可用的积分变量进行了比较。对于两种机动，计算流体动力学和实验之间的差异大多在10%以内，考虑到这些计算的复杂程度，这是非常令人满意的。模拟也与波，并与推进在任何一个恒定的RPM或扭矩。在Fr = 0.41的情况下，对20/20 Z字形机动进行了模型和全尺寸仿真。全尺寸情况下产生的边界层轮廓比模型规模与不同的反应时间和操纵所需的处理。结果表明，URANS计算的机动是可行的，但问题的充分建模的螺旋桨仍然有待解决。
Unsteady Reynolds averaged Navier–Stokes (URANS) computations of standard maneuvers are performed for a surface combatant at model and full scale. The computations are performed using CFDShip-Iowa v4, a free surface solver designed for 6DOF motions in free and semi-captive problems. Overset grids and a hierarchy of bodies allow the deflection of the rudders while the ship undergoes 6DOF motions. Two types of maneuvers are simulated: steady turn and zigzag. Simulations of steady turn at 35° rudder deflection and zigzag 20/20 maneuvers forFr= 0.25 and 0.41 using constant RPM propulsion are benchmarked against experimental time histories of yaw, yaw rate and roll, and trajectories, and also compared against available integral variables. Differences between CFD and experiments are mostly within 10 % for both maneuvers, highly satisfactory given the degree of complexity of these computations. Simulations are performed also with waves, and with propulsion at either constant RPM or torque. 20/20 zigzag maneuvers are simulated at model and full scale forFr= 0.41. The full scale case produces a thinner boundary layer profile compared to the model scale with different reaction times and handling needed for maneuvering. Results indicate that URANS computations of maneuvers are feasible, though issues regarding adequate modeling of propellers remain to be solved.