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It is proved that the simplified Navier--Stokes (SNS) equations presented by Gao Zhi,Davis and Golowachof--Kuzbmin--Popof (GKP) are respectively regular and singular neara separation point for a two--dimensional laminar flow over a flat plate. The order of thealgebraic singularity of Davis and GKP equation near the separation point is indicated.A comparison among the classical boundary layer (CBL) equations, Davis and GKP equations,Gao Zhi equations and the complete Navier--Stokes (NS) equations near the separationpoint is given. 相似文献
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数据同化中的伴随方法的有关问题的研究 总被引:10,自引:0,他引:10
关于伴随方法应用中只能利用模式的伴随的观点,被认为是有疑问的.所作的数值模拟实验表明,对于潮波模型而言,方程的伴随能够得到与模式的伴随同样的结果:调和常数的实测值与模拟值的振幅差的绝对值的平均小于5.0 cm,迟角差的绝对值的平均小于5.0°.这些结果都能够体现渤、黄海M2分潮的基本特征.作为对比,也利用前人的方法对渤、黄海的M2分潮潮波进行了数值模拟,首先借助于历史资料和观测资料得到开边界的初始猜测,然后对开边界的初始猜测值进行调整,以得到与高度计资料之差尽可能小的模拟结果.但由于开边界的值共有72个,究竟有哪些值需要调整,需要如何调整,只有经过不断的调试,才能部分地解决这些问题.工作量大且很难得到令人满意的结果.该文实现了确定开边界条件的自动化过程,这与前人的方法相比,有无可比拟的优势.需要特别强调的是如果利用方程的伴随,可以避免繁琐而冗长的数学推导.因而说明方程的伴随也应该引起足够的重视. 相似文献
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多子阵干涉合成孔径声呐 总被引:2,自引:0,他引:2
在完成了轨道式干涉合成孔径声呐(InSAS)原理样机的基础上,研制开发了一种新型的水面拖曳式干涉合成孔径声呐系统。成像算法采用非停走停运动误差补偿的多子阵逐线算法。试验数据表明该系统稳定可靠,并成功获取了干涉合成孔径图像,其距离和方位分辨率分别达到了5 cm和10 cm,测深精度优于国际海道测量组织(IHO)标准。 相似文献
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We investigate the effective dielectric responses of graded spherical composites under an external uniform electric field by taking the dielectric function of spherical inclusion, εi = cr^ke^βr, where r is the inner distance of a point inside the particle from the centre of the spherical particle in the coordination. In the dilute limit, our exact result is used to test the validity of differential effective dipole approximation (DEDA) for estimating the effective response of graded spherical composites and it is shown that the DEDA is in excellent agreement with the exact result. 相似文献
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A method for determining effective dielectric responses of Kerr-like coated nonlinear composites under the alternating current (AC) electric field is proposed by using perturbation approach. As an example, we have investigated the composite with coated cylindrical inclusions randomly embedded in a host under an external sinusoidal field with finite frequency ω. The local field and potential of composites in general consists of components with all harmonic frequencies. The effective nonlinear AC responses at all harmonics are induced by the coated nonlinear composites because of the nonlinear constitutive relation. Moreover, we have derived the formulae of effective nonlinear AC responses at the fundamental frequency and the third harmonic in the dilute limit. 相似文献
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IntroductionInthepast 40yearsofdevelopmentofnumericalanalysisandassimilationschemes,mostpresentedschemesbelongtooneofthreebasicallydifferentclassesofalgorithms :localpolynomialinterpolationmethods,statistical (optimal)interpolationmethodsandvariationalnumericalanalysismethods.Theadjointmethodinvariationalnumericalanalysisiswidelyusedinmeteorologyandoceanography[1 ].Itisusedtosolvemanyvariouspracticalproblems,includingoptimizationofparameters,initialconditionsandboundaryconditionsinthemodel.Tal… 相似文献
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海表盐度是描述海洋的一个重要参量,海表盐度的微波探测是海洋遥感研究的重要内容.利用黄海实测盐度数据和海表亮温资料,建立了一个适用于黄海近岸的盐度反演模式.在没有海浪破碎情况下,利用L波段的亮温资料反演海洋表层盐度.本模式充分考虑了海面粗糙度的影响,从海水亮温和海水的介电常数反演的表层盐度和实测的表层海水盐度基本一致,其平均绝对误差为0.288psu,与同类模式相比具有较高的精度.
关键词:
盐度
亮温
辐射率
介电常数 相似文献
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