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多孔介质中含溶解反应的互溶驱替过程格子Boltzmann研究
多孔介质 互溶驱替 溶解反应 格子Boltzmann方法
2022/3/30
采用格子Boltzmann方法研究了孔隙尺度下多孔介质内含流固溶解反应的互溶驱替过程，重点研究了被驱替流体与驱替流体黏性差异较大的情况下，溶解反应引起的多孔介质内部结构变化对驱替过程的影响；定量分析了不同达姆科勒数及佩克莱数下多孔介质孔隙率和驱替过程驱替效率随时间的演变。研究结果表明：达姆科勒数较大时，溶解反应的发生会在多孔介质内部生成虫洞，导致一部分被驱替流体不能被波及，驱替流体沿虫洞离开多孔介...
采用介观格子Boltzmann方法模拟界面张力作用下三维流体界面的Rayleigh-Taylor（RT）不稳定性的增长过程，主要分析表面张力对流体界面动力学行为及尖钉和气泡后期增长的影响机制。首先发现三维RT不稳定性的发生存在临界表面张力（σc），其值随着流体Atwood数的增大而增大，且数值预测值与理论分析结果σc=（ρh？ρl）g/k2一致。另外，随着表面张力的增大，不稳定性演化过程中界面卷吸...
Landau damping of spin waves in trapped Boltzmann gases
Ultracold gas boltzmann spatial dependence
2014/12/20
A semiclassical method is used to study Landau damping of transverse pseudo-spin waves in harmonically trapped ultracold gases in the collisionless Boltzmann limit. In this approach, the time evolutio...
Anisotropic spin diffusion in trapped Boltzmann gases
Trapped bose gas mixture dynamics grain boltzmann constant
2014/12/20
Recent experiments in a mixture of two hyperfine states of trapped Bose gases show behavior analogous to a spin-1/2 system, including transverse spin waves and other familiar Leggett-Rice-type effects...
Numerical Study of the Properties of the Central Moment Lattice Boltzmann Method
Numerical Study Properties the Central Moment Lattice Boltzmann Method
2012/2/29
Central moment lattice Boltzmann method (LBM) is one of the more recent developments among the lattice kinetic schemes for computational fluid dynamics. A key element in this approach is the use of ce...
Incorporating Forcing Terms in Cascaded Lattice-Boltzmann Approach by Method of Central Moments
Incorporating Forcing Terms Cascaded Lattice-Boltzmann Approach Central Moments
2012/2/29
Cascaded lattice-Boltzmann method (Cascaded-LBM) employs a new class of collision operators aiming to improve numerical stability. It achieves this and distinguishes from other collision operators, su...
利用格子Boltzmann方法, 模拟电磁场中的圆柱绕流过程, 研究电磁力对圆柱所受阻力的影响, 并分析了曲线边界处理方法和曲线边界受力的计算方法; 计算得到了不同强度的电磁力作用下圆柱绕流的流线、 等涡线及阻力系数. 结果表明, 电磁力能改变圆柱绕流的边界层结构, 延缓边界层的分离, 同时还能有效抑制旋涡的脱落, 减少阻力。
A fully relativistic lattice Boltzmann algorithm
Relativistic fluid dynamics Quark-gluon plasmas Lattice Boltzmann
2011/7/20
Starting from the Maxwell-Juettner equilibrium distribution, we develop a relativistic lattice Boltzmann (LB) algorithm capable of handling ultrarelativistic systems with flat, but expanding, spacetim...
A geometric derivation of the linear Boltzmann equation for a particle interacting with a Gaussian random field
Processes in random environments Quantum field theory Coherent states Kinetic theory of gases
2011/8/25
Abstract: The linear Boltzmann equation is derived from a microscopic quantum model of a particle interacting, in the weak coupling limit, with a translation invariant and centered Gaussian random fie...
Abstract: Difference Boltzmann Equation is derived in a plane wavelets representation with account of two-particle correlations. It is shown that the set of plane wavelet orthonormal functions is comp...
The Boltzmann equation and corresponding extremal problems
Boltzmann equation entropy energy density distance mo-ments global Maxwellian function
2011/7/26
The Boltzmann equation and corresponding extremal problems.
Prandtl number effects in MRT Lattice Boltzmann models for shocked and unshocked compressible fluids
lattice Boltzmann method compressible flows multiple-relaxation-time Prandtl number shock wave reaction
2011/9/9
For compressible fluids under shock wave reaction, we have proposed two Multiple-Relaxation-Time (MRT) Lattice Boltzmann (LB) models [F. Chen, et al, EPL 90 (2010) 54003; Phys. Lett. A 375 (2011) 2129...
A key question in the study of N=2 supersymmetric string or field theories is to understand the decay of BPS bound states across walls of marginal stability in the space of parameters or vacua. By re...
The Quantum Boltzmann Equation in Semiconductor Physics
Nonequilibrium kinetics excitons,plasma Bose-Einstein condensation
2010/11/23
The quantum Boltzmann equation, or Fokker-Planck equation, has been used to successfully explain a number of experiments in semiconductor optics in the past two decades. This paper reviews some of the...
Landauer vs. Boltzmann and Full Dispersion vs. Debye Model Evaluation of Lattice Thermal Conductivity
Landauer vs. Boltzmann Debye Model Evaluation Lattice Thermal Conductivity
2010/11/23
Using a full dispersion description of phonons, the thermal conductivities of bulk Si and Bi2Te3 are evaluated using a Landauer approach and related to the conventional approach based on the Boltzmann...