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mode coupling in converging Richtmyer-Meshkov instability of dual-mode interface

Acta Mechanica Sinica 2020年第2期36卷 356-366页

作者： Zhangbo Zhou Juchun Ding Zhigang Zhai Wan Cheng Xisheng Luo Advanced Propulsion Laboratory Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China Mechanical Engineering Physical Science and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

The converging Richtmyer-Meshkov(RM)instability on single-and dual-mode N2/SF6 interfaces is studied by an upwind conservation element and solution element *** unperturbed case is first considered,and it is found that the shocked interface undergoes a long-term deceleration after a period of uniform *** evolution of single-mode interface at the early stage exhibits an evident nonlinearity,which can be reasonably predicted by the nonlinear model of Wang et al.(Phys Plasmas 22:082702,2015).During the deceleration stage,the perturbation amplitude drops quickly and even becomes a negative(phase inversion)before the reshock due to the Rayleigh-Taylor(RT)*** the reshock,the interface experiences a phase inversion again or does not,depending on the reshock *** growth of the second-order harmonic in the deceleration stage clearly reveals the competition between the RT effect and the *** dual-mode interfaces,the growth of the first mode(wavenumber k1)relies heavily on the second mode(wavenumber k2)due to the mode coupling ***,for cases where k2 is an even or odd multiple of k1,the growth of the first mode is inhibited or promoted depending on its initial amplitude sign and the phase difference between two basic waves,while for cases where k2 is a non-integer multiple of k1,the second mode has negligible influence on the first *** a systematic study,signs of perturbation amplitudes of the generated k2−k1 and k2+k1 waves are obtained for all possible dual-mode configurations,which are reasonably predicted by a modified Haan model(Phys Fluids B 3:2349-2355,1991).

关键词： Converging Richtmyer-Meshkov instability Dual-mode interface mode coupling

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mode coupling in nonlinear Kelvin-Helmholtz instability

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Chinese Physics B 2008年第10期17卷 3792-3798页

作者：王立锋叶文华李英骏孟立民 China University of Mining and Technology Institute of Applied Physics and Computational Mathematics Department of Physics Zhejiang University

This paper investigates the interaction of a small number of modes in the two-fluid Kelvin-Helmholtz instability at the nonlinear regime by using a two-dimensional hydrodynamic code. This interaction is found to be relatively long range in wave-number space and also it acts in both directions, i.e. short wavelengths affect long wavelengths and vice versa. There is no simple equivalent transformation from a band of similar modes to one mode representing their effective amplitude. Three distinct stages of interaction have been identified.

关键词： Kelvin-Helmholtz instability mode coupling numerical simulation

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mode coupling with Fabry-Perot modes in photonic crystal slabs

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Chinese Physics B 2024年第8期33卷 90-94页

作者：秦恳胡鹏刘杰向红韩德专 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 401331China School of Science Chongqing Key Laboratory of New Energy Storage Materials and DevicesChongqing University of TechnologyChongqing 400054China

Fabry–Perot(FP)modes are a class of fundamental resonances in photonic crystal(PhC)*** to their low quality factors,FP modes are frequently considered as background fields with their resonance nature being ***,FP modes can play important roles in some phenomena,as exemplified by their coupling with guided resonance(GR)modes to achieve bound states in the continuum(BIC).Here,we further demonstrate the genuine resonance mode capability of FP modes PhC ***,we utilize temporal coupled-mode theory to obtain the transmittance of a PhC slab based on the FP ***,we construct exceptional points(EPs)in both momentum and parameter spaces through the coupling of FP and GR ***,we identify a Fermi arc connecting two EPs and discuss the far-field polarization *** work elucidates that the widespread FPs in PhC slabs can serve as genuine resonant modes,facilitating the realization of desired functionalities through mode coupling.

关键词： Fabry–Perot mode photonic crystal slab mode coupling exceptional point

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Mueller matrix analysis for all optical fiber co-existence of birefringence-polarization dependent gain-mode coupling at a single wavelength

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Chinese Physics B 2011年第11期20卷 13-18页

作者：尚超吴重庆李政勇杨双收高凯强余贶琭冯震 Key Laboratory of Education Ministry on Luminescence and Optical Information Technology Institute of Optical InformationBeijing Jiaotong University

Birefringence （polarization-related phase-shift）, polarization dependent gain （PDG） and mode coupling are three factors that may synchronously influence the transmission of single-wavelength polarized light in optical fibers. This paper obtains a new Mueller matrix analysis, which can be used under conditions that all these three factors are existing and changing. According to our transmission model, the state of polarization （SOP） changes along an optical mierostructure fiber with co-existence of birefringence-PDG-mode coupling were simulated. The simulated results, which show the phenomena of SOP constringency, are in good agreement with previous theoretical analyses.

关键词： Mueller matrix birefringence polarization dependent gain mode coupling

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Single-mode antiresonant terahertz fiber based on mode coupling between core and cladding

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Chinese Physics B 2021年第12期30卷 430-436页

作者： Shuai Sun Wei Shi Quan Sheng Shijie Fu Zhongbao Yan Shuai Zhang Junxiang Zhang Chaodu Shi Guizhong Zhang Jianquan Yao Institute of Laser and Optoelectronics School of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Optoelectronic Information Science and Technology(Ministry of Education Tianjin UniversityTianjin 300072China

Based on the index-induced mode coupling between the higher-order mode in core and the fundamental mode in cladding tubes,the single-mode operation can be realized in any antiresonant fibers(ARFs)when satisfying that the area ratio of cladding tube and core is about 0.46:1,and this area ratio also should be modified according to the shape and the number of cladding *** the ARF with nodal core boundary,the mode in core also can couple with the mode in the wall of core boundary,which can further enhance the suppression of high-order ***,an ARF with conjoint semi-elliptical cladding tubes realizes a loss of higher-order mode larger than 30 dB/m;simultaneously,a loss of fundamental mode loss less than 0.4 dB/m.

关键词： terahertz mode coupling single-mode fiber

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Theoretical analysis of the mode coupling induced by heat of large-pitch micro-structured fibers

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Chinese Physics B 2015年第2期24卷 176-180页

作者：张海涛陈丹郝杰闫平巩马理 Center for Photonics and Electronics State Key Laboratory of TribologyDepartment of Precision InstrumentsTsinghua University Southwest Institute of Technical Physics

In this paper,a theoretical model to analyze the mode coupling induced by heat,when the fiber amplifier works at high power configuration,is *** model mainly takes into consideration the mode field change due to the thermally induced refractive index change and the coupling between modes.A method to predict the largest average output power of fiber is also proposed according to the mode coupling *** largest average output power of a large pitch fiber with a core diameter of 190 μm and an available pulse energy of 100 mJ is predicted to be 540 W,which is the highest in large mode field fibers.

关键词： fiber amplifier large pitch fiber mode coupling

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Phase Effect on mode coupling in Kelvin—Helmholtz Instability for Two-Dimensional Incompressible Fluid

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Communications in Theoretical Physics 2009年第10期52卷 694-696页

作者： WANG Li-Feng TENG Ai-Ping YE Wen-Hua XUE Chuang FAN Zheng-Feng LI Ying-Jun China University of Mining and Technology （Beijing） Beijing 100083 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P.O. Box 8009-12 Beijing 100088 China Department of Physics Zhejiang University Hangzhou 310028 China Center for Applied Physics and Technology Peking University Beijing 100871 China

This paper studies the phase effect in mode coupling of Kelvin-Helmholtz instability in two-dimensionalincompressible *** is found that there is an important growth phenomenon of every mode in the mode *** growth changes periodically with phase difference and in the condition of our simulation the period is about0.7π.The period characteristic is apparent in all stage of the mode coupling process,especially in the relatively laterstage.

关键词： Kelvin-Helmholtz instability mode coupling phase effect

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Effects of mode coupling between low-mode radiation flux asymmetry and intermediate-mode ablator roughness on ignition capsule implosions

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Matter and Radiation at Extremes 2017年第1期2卷 9-15页

作者： Jianfa Gu Zhensheng Dai Shiyang Zou Wenhua Ye Wudi Zheng Peijun Gu Shaoping Zhu Institute of Applied Physics and Computational Mathematics Beijing 100088China

The low-mode shell asymmetry and high-mode hot spot mixing appear to be the main reasons for the performance degradation of the National Ignition Facility(NIF)implosion *** effects of the mode coupling between low-mode P2 radiation flux asymmetry and intermediate-mode L=24 capsule roughness on the implosion performance of ignition capsule are investigated by two-dimensional radiation hydrodynamic *** is shown that the amplitudes of new modes generated by the mode coupling are in good agreement with the second-order mode coupling equation during the acceleration *** later flow field not only shows large areal density P2 asymmetry in the main fuel,but also generates large-amplitude spikes and *** the deceleration phase,the increasing mode coupling generates more new modes,and the perturbation spectrum on the hot spot boundary is mainly from the strong mode interactions rather than the initial perturbation *** combination of the low-mode and high-mode perturbations breaks up the capsule shell,resulting in a significant reduction of the hot spot temperature and implosion performance.

关键词： mode coupling Low-mode drive asymmetry Intermediate-mode capsule roughness Ignition capsule implosion

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Study of mode coupling on Coaxial Resonators

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Journal of Electronic Science and Technology 2011年第3期9卷 221-226页

作者： Rui Liu Hong-Fu Li School of Physical Electronics University of Electronic Science and Technology of China Chengdu 610054 China.

A study of mode coupling phenomenon of coaxial resonators has been conducted with theories. Through establishing the source-free transmission line equation, boundary conditions of the coaxial resonators with a corrugated inner conductor are analyzed. In the end, calculations are performed in a wide range of corrugation parameters for the resonator of the Karlsruhe Institute of Technology （KIT） relevant coaxial gyrotron.

关键词： Index Terms--Coaxial resonators gyrotron mode coupling simple surface impedance model.

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The coupling Structure Features Between (2,1) NTM and (1,1) Internal mode in EAST Tokamak

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Plasma Science and Technology 2015年第5期17卷 358-365页

作者：石同辉万宝年孙有文沈飚钱金平胡立群陈开云刘永 Institute of Plasma Physics Chinese Academy of Sciences

In the discharge of EAST tokamak, it is observed that （2, 1） neoclassical tearing mode （NTM） is triggered by mode coupling with a （1, 1） internal mode. Using singular value decomposition （SVD） method for soft X-ray emission and for electron cyclotron emission （ECE）, the coupling spatial structures and coupling process between these two modes are analyzed in detail. The results of SVD for ECE reveal that the phase difference between these two modes equals to zero. This is consistent with the perfect coupling condition. Finally, performing statistical analysis of r1/1, ξ1/1 and w2/1, we find that r1/1 more accurately represents the coupling strength than ξ1/1, and r1/1 is also strongly related to the （2, 1） NTM triggering, where r1/1 is the width of （1, 1） internal mode, ξ1/1 is the perturbed amplitude of （1, 1） internal mode, and w2/1 denotes the magnetic island width of （2, 1） NTM.

关键词： EAST NTM mode coupling SVD soft X-ray ECE

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