Oscillatory instability of fully 3D flow in a cubic diagonally lid-driven cavity

A numerical study of the transition to oscillatory flow in 3D lid-driven cubic cavity flows

In this article, three dimensional (3D) lid-driven cubic cavity flows have been studied numerically for various values of Reynolds number ($Re$). The numerical solution of the Navier-Stokes equations modeling incompressible viscous fluid flow in a cubic cavity is obtained via a methodology combining a first order accurate operator-splitting, $L^2$-projection Stokes solver, a wave-like equation treatment of the advection and finite element methods. The numerical results obtained for Re$=$400, 1000, and 3200 show a good agreement with available numerical and experimental results in literature. S…

Experimental observation of the steady - oscillatory transition in a cubic lid-driven cavity

Particle image velocimetry is applied to the lid-driven flow in a cube to validate the numerical prediction of steady - oscillatory transition at lower than ever observed Reynolds number. Experimental results agree with the numerical simulation demonstrating large amplitude oscillatory motion overlaying the base quasi-two-dimensional flow in the mid-plane. A good agreement in the values of critical Reynolds number and frequency of the appearing oscillations, as well as similar spatial distributions of the oscillations amplitude are obtained.

半圆腔内顶盖驱动流动中转变的数值研究

Numerical study of transitions in lid-driven flows in semicircular cavities

本文结合算子分裂、虚拟区域和有限元方法求解Navier-Stokes方程，研究了半圆腔内三维顶盖驱动流动，获得了产生振荡流动的临界雷诺数，并详细分析了其振荡模式与浅腔的异同。

驱动盖圆柱腔体内稀薄气体流动与传热的计算研究

Computational Study of Rarefied Gas Flow and Heat Transfer in Lid-driven Cylindrical Cavities

本研究通过DSMC和DUGKS数值模拟，系统研究了圆柱形驱动盖腔体内稀薄气体流动与传热，揭示了膨胀冷却、粘性耗散及逆梯度传热等效应，并比较了不同腔体形状，为MEMS/NEMS设计提供参考。

Three-dimensional flow in cavity with elevated helicity driven by parallel walls

The proposed flow in a 3-D cubic cavity is driven by its parallel walls moving in perpendicular directions to create a genuinely three-dimensional highly separated vortical flow yet having simple single-block cubical geometry of computational domain. The elevated level of helicity is caused by motion of a wall in the direction of axis of primary vortex created by a parallel wall. The velocity vector field is obtained numerically by using second-order upwind scheme and 200^3 grid. Helicity, magnitude of normalized helicity and kinematic vorticity number are evaluated for Reynolds numbers rangin…