Physica D: Nonlinear Phenomena ( IF 2.7 ) Pub Date : 2020-07-24 , DOI: 10.1016/j.physd.2020.132657 Je-Chiang Tsai , Zhengyang Zhang
We study the shape of spiral curves in an annulus which is governed by curvature flow equations with a driving force term. We establish that as the model parameter (which is the coefficient of the curvature) approaches , the profile of the spiral curve tends to a line segment, while as approaches , the limiting profile of the spiral curve is the involute of the inner circle of the annulus and the associated limiting rotational speed is the ratio of a constant , which is the propagation speed of the planar wave, to the inner radius of the annulus. Hence the model parameter can be viewed as a twisted parameter. Finally, the spiral curve under consideration is shown to be with sign-changing curvature and exponentially stable.
中文翻译:
曲率对螺旋曲线渐近轮廓的影响
我们研究了由驱动力项与曲率流方程控制的环面中螺旋曲线的形状。我们将其确定为模型参数 (即曲率系数)方法 ,螺旋曲线的轮廓倾向于一条线段,而当 方法 ,螺旋曲线的极限轮廓是环的内圆的渐开线,而相关的极限旋转速度是常数的比率 ,即平面波到环的内半径的传播速度。因此模型参数可以视为扭曲参数。最后,所考虑的螺旋曲线显示出具有符号改变的曲率并且呈指数稳定。