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The phenomenon of dissipation enhancement by transport noise is shown for stochastic 2D Navier–Stokes equations in velocity form. In the 3D case, suppression of blow-up is proved for stochastic Navier...
This paper studies a Cauchy problem for a scalar multidimensional (multi-d) viscous convex conservation law, in which the initial data is a planar viscous shock with a multi-d periodic perturbation. W...
基于波流边界层特性的海湾水沙运动模拟关键技术研究与应用
We prove the time-asymptotic stability of composite waves consisting of the superposition of a viscous shock and a rarefaction for the one-dimensional compressible barotropic Navier-Stokes equations. ...
We are concerned with the three-dimensional incompressible Navier–Stokes equations driven by an additive stochastic forcing of trace class. First, for every divergence free initial condition in $L^{2}...
We establish global-in-time existence and non-uniqueness of probabilistically strong solutions to the three dimensional Navier--Stokes system driven by space-time white noise. In this setting, solutio...
In this paper, we study the existence of rotating and traveling wave solutions for the generalized surface quasi-geostrophic (gSQG) equation. The solutions are obtained by maximization of the energy o...
This paper is concerned with the asymptotic stability of a composite wave of two viscous shocks under spatially periodic perturbations for the 1-d full compressible Navier--Stokes equations. It is pro...
We are concerned with the global existence theory for spherically symmetric solutions of the multidimensional compressible Euler equations with large initial data of positive far-field density so that...
We study the steady Boltzmann equation in half-space, which arises in the Knudsen boundary layer problem, with diffusive reflection boundary conditions. Under certain admissible conditions, we establi...
The Cauchy problem for the barotropic compressible Navier--Stokes equations on the whole two-dimensional space with vacuum as far field density is considered. When the shear viscosity is a positive co...
近期, J. Fluid Mech.刊登了中科院力学所杨子轩研究团队在槽道湍流壁面压力方面的研究进展,论文题目为《槽道湍流中壁面压力的时空能谱》(On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow)。
如何从最基本的统计动力学出发控制湍流是长期以来湍流和流体力学理论中的一个基础性问题,同时对于应用基础研究有重要价值,其中对称性在物理学和力学基本理论中均具有根本性意义。近日,力学所高温气体动力学国家重点实验室杨焱副研究员与南京市高淳区速诚基础与交叉科学研究中心首席科学家朱建州博士合作,从对称性原理出发,在螺度控制湍流压缩性方面取得了进展。
磁等离子体动力学推力器是空间高功率电推进装置的典型代表,磁等离子体动力学过程是其核心工作机制。为深入理解外磁场对其工作特性的影响,本文采用粒子云(particleincell,PIC)方法结合基于自相似准则的缩比模型,进行外加磁场作用下磁等离子体动力学推力器工作过程的建模仿真,通过与实验结果对比验证模型和方法的可靠性,并重点分析推力器点火启动过程的等离子特性参数分布,以及外磁场和阴极电流对推力器工...
直接驱动激光聚变通过整形后的纳秒脉冲激光辐照氘氚(DT)球壳靶,经球对称压缩加速后,在中心转滞获得高温等离子体热斑,实现聚变点火.在球壳靶受到压缩和加速过程中等离子体界面的流体力学不稳定性,特别是瑞利-泰勒不稳定性的增长有可能会对压缩壳层造成破坏,导致点火的失败.本文通过理论解析和数值模拟,对基于Zhang等提出的双锥对撞点火方案(2020Philos.Trans.AMath.Phys.Eng.S...

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