梯度流是指由于等压面相当于等势面发生倾斜时，出现压强梯度力的水平分量，海水因压力分布而产生运动，此时还派生出科里奥利力和摩擦力与之平衡，而形成的海流。海水密度的不均匀分布从而导致梯度流产生。一般情况下，总梯度流包括相对梯度流和坡度流两部分。
由流体径向温度梯度引起的离心浮力对旋流强化传热效果有重要影响。
Centrifugal buoyancy arising from radial temperature gradient of fluid has a great influence on the enhanced heat transfer performance of swirling flow.
给出一种结合梯度矢量流(GVF)及椭圆变形模板的椭圆提取新算法。
A new ellipse extraction algorithm based on the ellipse-special deformable templates and gradient vector flow (GVF) was proposed.
本文提出了迭代梯度矢量流参数变形模型(IGVF)。
In this thesis, a new deformable model called Iterative Gradient Vector Flow (IGVF) is developed.
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