以一种新方法建立了俯仰激励下圆柱贮箱类液固耦合系统的动力学方程。对液体子系统和结构子系统分别得到压力体积分形式的 L agrange函数和标准形式 L agrange函数 (动能减去势能 ) ,由变分方程和 L agrange方程可以建立系统的动力学方...以一种新方法建立了俯仰激励下圆柱贮箱类液固耦合系统的动力学方程。对液体子系统和结构子系统分别得到压力体积分形式的 L agrange函数和标准形式 L agrange函数 (动能减去势能 ) ,由变分方程和 L agrange方程可以建立系统的动力学方程。通过数值仿真发现 ,在一定的激励幅值和频率下 ,该耦合系统会出现零点漂移。展开更多
Liquid sloshing is a kind of very complicated free surface flow and exists widely in many fields.In order to calculate liquid sloshing damping precisely a volume of fluid method based on finite volume scheme is used t...Liquid sloshing is a kind of very complicated free surface flow and exists widely in many fields.In order to calculate liquid sloshing damping precisely a volume of fluid method based on finite volume scheme is used to simulate free surface flows in partly filled cylindrical containers.A numerical method is pre-sented to simulate the movement of the free surface flow,in which a piecewise linear interface con-struction scheme and an unsplit Lagrangian advection scheme instead of Eulerian advection scheme are used.The damping performance of liquid sloshing in cylindrical containers under fundamental sloshing mode is investigated.There are four factors determining the surface-wave damping:free surface,boundary-layer,interior fluid and contact line.In order to study different contributions from these four factors to whole damping,several examples are simulated.No-slip and slip wall boundary conditions on both side wall and bottom wall of the cylindrical containers are studied to compare with the published results obtained by solving Stokes equations.In the present method the first three main factors can be considered.The simulation results show that the boundary-layer damping contribution increases while the interior fluid damping contribution decreases with increase of Reynolds number.展开更多
A new computing technique is described for the solution'of dilute gas-particle fluid flow problems.The com- mon SIMPLE method is used for the calculation of the gas phase,but for the calculation of the particle ph...A new computing technique is described for the solution'of dilute gas-particle fluid flow problems.The com- mon SIMPLE method is used for the calculation of the gas phase,but for the calculation of the particle phase the MacCormack method(80 style)is used.Using the technique for gas-particle flows in a rotating cylindrical con- tainer,the field distributions of both phases are obtained.An important parameter Sk(Stokes number)is taken re- spectively as 0.01,0.1 and 1.The results show the influence of Sk on the flows.The collisions between particles and the side wall of the container are predicted when Sk=1.展开更多
We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform...We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform analysis.The swirling of water in the container had three frequency components;the frequency responses of each frequency component are reported herein.When swirling occurs in a rotating cylindrical container,it was found that the wave rotating in the same direction as the rotation of the cylindrical container and the wave rotating in the opposite direction to the cylindrical container exist at the same time.The swirling direction was determined by the relationship of these magnitude.展开更多
文摘以一种新方法建立了俯仰激励下圆柱贮箱类液固耦合系统的动力学方程。对液体子系统和结构子系统分别得到压力体积分形式的 L agrange函数和标准形式 L agrange函数 (动能减去势能 ) ,由变分方程和 L agrange方程可以建立系统的动力学方程。通过数值仿真发现 ,在一定的激励幅值和频率下 ,该耦合系统会出现零点漂移。
基金Supported by the National Natural Science Foundation of China(Grant No.10532010)
文摘Liquid sloshing is a kind of very complicated free surface flow and exists widely in many fields.In order to calculate liquid sloshing damping precisely a volume of fluid method based on finite volume scheme is used to simulate free surface flows in partly filled cylindrical containers.A numerical method is pre-sented to simulate the movement of the free surface flow,in which a piecewise linear interface con-struction scheme and an unsplit Lagrangian advection scheme instead of Eulerian advection scheme are used.The damping performance of liquid sloshing in cylindrical containers under fundamental sloshing mode is investigated.There are four factors determining the surface-wave damping:free surface,boundary-layer,interior fluid and contact line.In order to study different contributions from these four factors to whole damping,several examples are simulated.No-slip and slip wall boundary conditions on both side wall and bottom wall of the cylindrical containers are studied to compare with the published results obtained by solving Stokes equations.In the present method the first three main factors can be considered.The simulation results show that the boundary-layer damping contribution increases while the interior fluid damping contribution decreases with increase of Reynolds number.
文摘A new computing technique is described for the solution'of dilute gas-particle fluid flow problems.The com- mon SIMPLE method is used for the calculation of the gas phase,but for the calculation of the particle phase the MacCormack method(80 style)is used.Using the technique for gas-particle flows in a rotating cylindrical con- tainer,the field distributions of both phases are obtained.An important parameter Sk(Stokes number)is taken re- spectively as 0.01,0.1 and 1.The results show the influence of Sk on the flows.The collisions between particles and the side wall of the container are predicted when Sk=1.
文摘We examined wave phenomena pertinent to water in a rotating,laterally oscillating cylindrical container.In particular,we measured the time-dependent dynamic water pressure and pressure change by fast Fourier transform analysis.The swirling of water in the container had three frequency components;the frequency responses of each frequency component are reported herein.When swirling occurs in a rotating cylindrical container,it was found that the wave rotating in the same direction as the rotation of the cylindrical container and the wave rotating in the opposite direction to the cylindrical container exist at the same time.The swirling direction was determined by the relationship of these magnitude.
