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Nodal Points and the Nonlinear Stability of High-Order Methods for Unsteady Flow Problems on Tetrahedral Meshes
Nodal Points Nonlinear Stability High-Order Methods Unsteady Flow Problems Tetrahedral Meshes
2015/7/3
High-order methods have the potential to efficiently generate accurate solutions to fluid dynamics problems of practical interest. However, high-order methods are less robust than lower-or...
An Assessment of Dual-Time Stepping, Time Spectral and Artificial Compressibility based Numerical Algorithms for Unsteady Flow with Applications to Flapping Wings
Assessment Dual-Time Stepping Time Spectral Compressibility based Numerical Algorithms Unsteady Flow Flapping Wings
2015/7/3
The objective of this study is to compare and contrast three numerical algorithms that can be used to estimate the forces and pressure distribution on wings in flapping motion. All algorithms ar...
Unsteady Flow Investigations in an Axial Turbine Using the Massively Parallel Flow Solver TFLO
Unsteady Flow Investigations Axial Turbine Massively Parallel Flow Solver TFLO
2015/7/2
The results from two numerical simulations of the unsteady °ow in a 1-1/2 stage axial °ow turbine are presented and compared with experimental data to show both the e®ect of blade count on the so...
Applications of Dual Time Stepping to Fully Implicit Runge-Kutta Schemes for Unsteady Flow Calculations
Unsteady Flow Calculations Time Stepping
2015/6/18
Accordingly, a fast steady state solver is an essential building block for an implicit
scheme. This leads to a circular situation. We need an implicit scheme for fast
convergence to a steady state, ...
Both third-order and fourth-order SD methods
are used on unstructured quadrilateral grids. The vortex shedding pattern of an airfoil
in an oscillating plunge motion becomes asymmetric at a su±cientl...
3D unsteady flow in a centrifugal fan: impeller - volute interaction
aeroacoustics centrifugal fan CFD turbomachinery
2010/3/11
The purpose of this study is to show, using Computational Fluid Dynamics (CFD) tools, the complex phenomena related to the internal flow in a squirrel-cage fan and their influence on the aeroacoustic ...
离心泵内部不稳定流场压力脉动特性分析（Analysis on Pressure Fluctuation of Unsteady Flow in a Centrifugal Pump）
离心泵 非定常 压力脉动 RNG k-ε湍流模型
2010/4/1
离心泵内部流场压力脉动是影响机组运行稳定性的关键因素，采用RNG k-ε湍流模型和滑移网格技术研究泵内部非定常流动,得到了不同工况下监测点的压力脉动情况，并对其进行了频域分析。分析结果表明，叶轮与隔舌间的动静干扰是产生压力脉动的主要脉动源，并在整个离心泵流道内传播；且在不同工况下，叶片通过频率均占主导地位，压力面脉动幅值大于吸力面脉动幅值；蜗壳出口同一测面脉动情况近似。 The pressure ...
离心泵内部动静干涉作用的数值模拟（Numerical Simulation of Unsteady Flow in a Centrifugal Pump）
离心泵 非定常 动静干涉 压力边界条件
2009/9/11
采用压力边界条件对一单级单吸蜗壳式离心泵进行了三维非定常数值模拟计算，模拟过程中给定离心泵入口总压和出口静压，结合滑移网格技术，成功地捕捉了叶轮—蜗壳的动静干涉作用引起的非定常流动特性。计算结果表明，离心泵内流场周期性脉动明显，蜗壳内静压及叶片载荷分别以叶片旋转频率、叶轮旋转频率发生周期性变化。蜗壳几何形状的不对称性影响了动静干涉作用在离心泵内部的传播，引起了离心泵内流动沿周向分布不均匀现象。
An experimental investigation of the unsteady flow in a two-stage low-pressure research turbine
axial flow turbine hot-wire measurements rotor-stator aerodynamic interaction
2010/3/12
Results of an experimental investigation of the unsteady flow in a two-stage low-pressure large-scale research turbine are presented. Velocity and turbulence measurements were performed upstream and d...