Compression and stretching of ring-vortex solitons, which is a novel self-similar solution of（2＋1）-dimensional diffraction decreasing waveguide, is investigated analytically and numerically. We obtain the ring-vort...Compression and stretching of ring-vortex solitons, which is a novel self-similar solution of（2＋1）-dimensional diffraction decreasing waveguide, is investigated analytically and numerically. We obtain the ring-vortex solitons via the similarity transformation method. The distance modulation for the width, the diffraction, and the nonlinear response, strongly affects the form and the behavior of the self-similar vortex, and facilitates the efficient compression of optical waves. This approximate ring-vortex solitons can reflect the real properties of self-similar optical vortex beams during propagation under certain parameter window selection. Specific examples and figures are given to illustrate discussed features. The results obtained in this paper may have potential values for all-optical data-processing schemes and the design of beam compressors and amplifiers.展开更多
为探究水下气体涡环生成及演化的物理机制,运用流体体积(Volume of Fluid,VOF)法两相流模型对涡环生成条件和发展过程进行了模拟,并开展了水下气体涡环发生实验,对比验证了数值模拟结果的准确性。研究表明,水下气体涡环生成及发展需要...为探究水下气体涡环生成及演化的物理机制,运用流体体积(Volume of Fluid,VOF)法两相流模型对涡环生成条件和发展过程进行了模拟,并开展了水下气体涡环发生实验,对比验证了数值模拟结果的准确性。研究表明,水下气体涡环生成及发展需要经历夹断、射流、拉伸和变形4个阶段。通过实验及数值结果数据拟合得到形成有效涡环需要满足的通气压强、通气时间等参数范围,揭示了涡环的结构特征和动力学特性满足Fr相似性准则以及涡量、环量随时间变化的趋势,可为探究水下气体涡环生成及演化规律提供理论借鉴。展开更多
文摘Compression and stretching of ring-vortex solitons, which is a novel self-similar solution of（2＋1）-dimensional diffraction decreasing waveguide, is investigated analytically and numerically. We obtain the ring-vortex solitons via the similarity transformation method. The distance modulation for the width, the diffraction, and the nonlinear response, strongly affects the form and the behavior of the self-similar vortex, and facilitates the efficient compression of optical waves. This approximate ring-vortex solitons can reflect the real properties of self-similar optical vortex beams during propagation under certain parameter window selection. Specific examples and figures are given to illustrate discussed features. The results obtained in this paper may have potential values for all-optical data-processing schemes and the design of beam compressors and amplifiers.
文摘为探究水下气体涡环生成及演化的物理机制,运用流体体积(Volume of Fluid,VOF)法两相流模型对涡环生成条件和发展过程进行了模拟,并开展了水下气体涡环发生实验,对比验证了数值模拟结果的准确性。研究表明,水下气体涡环生成及发展需要经历夹断、射流、拉伸和变形4个阶段。通过实验及数值结果数据拟合得到形成有效涡环需要满足的通气压强、通气时间等参数范围,揭示了涡环的结构特征和动力学特性满足Fr相似性准则以及涡量、环量随时间变化的趋势,可为探究水下气体涡环生成及演化规律提供理论借鉴。
