The motion of a submarine near the sea bottom was paid much attention in the past few years. The RANS-based CFD methods are used to investigate the hydrodynamic characteristics of the DARPA SUBOFF model (DTRC model 5470) moving near a level bottom in this paper. It is concluded that the bottom effects on the submarine hydrodynamics can be expressed in the linear formulae of the bottom clearance parameter ζ 2= (D/H)2 ,i.e.,the bottom effects are rather proportional to the square of the inverse of the clearance H.The numerical study in this paper shows that the RANSbased CFD methods can be used as a practical tool to predict the hydrodynamic forces of a maneuvering submarine at considerable high accuracy.%本文以SUBOFF潜艇模型为研究对象,利用FLUENT6.1软件,数值模拟了无限水域下的变攻角水动力特性曲线,与泰勒水池的模型试验结果比较分析表明,数值模拟具有较好的精度.本文用FLUENT6.1软件进一步计算分析了SUBOFF潜艇模型带攻角、带漂角、不同近底距离直航状态下的水动力特性,结果表明:无论有无攻角和漂角存在,潜艇运动(除阻力外)的五个水动力分量随近底距离的变化与"近底距离倒数平方"呈良好的线性关系,例如,Z(H)∝1/H2,或Z′(ζ)∝ζ2,其中ζ=D/H为无量纲近底参数.
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