本文考虑了一类在铰接边界条件下具有一般非线性的广义Boussinesq方程。利用无限维KAM (Kolmogorov-Arnold-Moser)理论,我们证明了在足够小的扰动下,这类方程存在无限多个小振幅、实解析且线性稳定的概周期解。This paper considers a c...本文考虑了一类在铰接边界条件下具有一般非线性的广义Boussinesq方程。利用无限维KAM (Kolmogorov-Arnold-Moser)理论,我们证明了在足够小的扰动下,这类方程存在无限多个小振幅、实解析且线性稳定的概周期解。This paper considers a class of generalized Boussinesq equations with general nonlinearities under hinged boundary conditions. Using infinite-dimensional KAM (Kolmogorov-Arnold-Moser) theory, we prove that for sufficiently small perturbations, the equations admit infinitely many of small amplitude, real analytic and linearly stable almost periodic solutions.展开更多
In this paper,we construct two fully decoupled,second-order semi-discrete numerical schemes for the Boussinesq equations based on the scalar auxiliary variable(SAV)approach.By introducing a scalar auxiliary variable,t...In this paper,we construct two fully decoupled,second-order semi-discrete numerical schemes for the Boussinesq equations based on the scalar auxiliary variable(SAV)approach.By introducing a scalar auxiliary variable,the original Boussinesq system is transformed into an equivalent one.Then we discretize it using the second-order backward di erentiation formula(BDF2)and Crank-Nicolson(CN)to obtain two second-order time-advanced schemes.In both numerical schemes,a pressure-correction method is employed to decouple the velocity and pressure.These two schemes possess the desired property that they can be fully decoupled with satisfying unconditional stability.We rigorously prove both the unconditional stability and unique solvability of the discrete schemes.Furthermore,we provide detailed implementations of the decoupling procedures.Finally,various 2D numerical simulations are performed to verify the accuracy and energy stability of the proposed schemes.展开更多
文摘本文考虑了一类在铰接边界条件下具有一般非线性的广义Boussinesq方程。利用无限维KAM (Kolmogorov-Arnold-Moser)理论,我们证明了在足够小的扰动下,这类方程存在无限多个小振幅、实解析且线性稳定的概周期解。This paper considers a class of generalized Boussinesq equations with general nonlinearities under hinged boundary conditions. Using infinite-dimensional KAM (Kolmogorov-Arnold-Moser) theory, we prove that for sufficiently small perturbations, the equations admit infinitely many of small amplitude, real analytic and linearly stable almost periodic solutions.
基金Supported by Research Project Supported by Shanxi Scholarship Council of China(2021-029)International Cooperation Base and Platform Project of Shanxi Province(202104041101019)+2 种基金Basic Research Plan of Shanxi Province(202203021211129)Shanxi Province Natural Science Research(202203021212249)Special/Youth Foundation of Taiyuan University of Technology(2022QN101)。
文摘In this paper,we construct two fully decoupled,second-order semi-discrete numerical schemes for the Boussinesq equations based on the scalar auxiliary variable(SAV)approach.By introducing a scalar auxiliary variable,the original Boussinesq system is transformed into an equivalent one.Then we discretize it using the second-order backward di erentiation formula(BDF2)and Crank-Nicolson(CN)to obtain two second-order time-advanced schemes.In both numerical schemes,a pressure-correction method is employed to decouple the velocity and pressure.These two schemes possess the desired property that they can be fully decoupled with satisfying unconditional stability.We rigorously prove both the unconditional stability and unique solvability of the discrete schemes.Furthermore,we provide detailed implementations of the decoupling procedures.Finally,various 2D numerical simulations are performed to verify the accuracy and energy stability of the proposed schemes.
