scholarly journals Implicit gas-kinetic unified algorithm based on multi-block docking grid for multi-body reentry flows covering all flow regimes

2016 ◽  
Vol 327 ◽  
pp. 919-942 ◽  
Author(s):  
Ao-Ping Peng ◽  
Zhi-Hui Li ◽  
Jun-Lin Wu ◽  
Xin-Yu Jiang
Keyword(s):  
Flow Regimes ◽  
Unified Algorithm ◽  
Multi Body

scholarly journals Gas‐kinetic unified algorithm for plane external force‐driven flows covering all flow regimes by modeling of Boltzmann equation

2020 ◽  
Vol 92 (8) ◽  
pp. 922-949
Author(s):  
Zhi‐Hui Li ◽  
Wen‐Qiang Hu ◽  
Ao‐Ping Peng ◽  
Jun‐Lin Wu ◽  
Chun‐Hian Lee
Keyword(s):  
Boltzmann Equation ◽  
External Force ◽  
Flow Regimes ◽  
Unified Algorithm

scholarly journals Gas-kinetic unified algorithm for hypersonic aerothermodynamics covering various flow regimes solving Boltzmann model equation

2015 ◽  
Vol 64 (22) ◽  
pp. 224703
Author(s):  
Li Zhi-Hui ◽  
Peng Ao-Ping ◽  
Fang Fang ◽  
Li Si-Xin ◽  
Zhang Shun-Yu
Keyword(s):  
Model Equation ◽  
Flow Regimes ◽  
Unified Algorithm ◽  
Boltzmann Model

The Comparative Analysis of Calculating the Equivalent Conicity Methods in Vehicles of Mechanical Engineering

2013 ◽  
Vol 644 ◽  
pp. 341-345
Author(s):  
Feng Tao Lin ◽  
Yue Ming Wang ◽  
Xiao Qing Dong
Keyword(s):  
Performance Evaluation ◽  
Comparative Analysis ◽  
Dynamics Simulation ◽  
Acceptance Testing ◽  
Engineering Practice ◽  
Unified Algorithm ◽  
Key Indicators ◽  
Theory Research ◽  
Multi Body ◽  
Equivalent Conicity

The equivalent conicity is the key indicators in the vehicles and multi-body dynamics simulation, and also in the vehicle's performance evaluation or acceptance testing. But it does not take into account the nonlinear contact influence, different reduction algorithms cause that technological exchanges and the vehicle's performance evaluation results are inconsistent and it is necessary to improve and simplify the description. Based on the overview of the parameters of the equivalent conicity, This article presents the contrast and comparative analysis of the two calculations of quasi-linear function of KLINGEL and the linear regression of the rolling radii difference function, also shows the influence of the contact nonlinearities on the wheel/rail contact geometry with the calculation of three CRH wheel/rail pairs(XP55,S1002CN and LMA) used the two methods, and also recommended that a unified algorithm should be adopted in order to lay a good foundation for engineering practice and theory research.

Numerical Simulations of Unsteady Flows From Rarefied Transition to Continuum Using Gas-Kinetic Unified Algorithm

2015 ◽  
Vol 7 (5) ◽  
pp. 569-596 ◽  
Author(s):  
Junlin Wu ◽  
Zhihui Li ◽  
Aoping Peng ◽  
Xinyu Jiang
Keyword(s):  
Velocity Distribution ◽  
Numerical Simulations ◽  
Velocity Distribution Function ◽  
Flow Regimes ◽  
Distribution Functions ◽  
Finite Difference Schemes ◽  
Two Dimensional ◽  
Time Step ◽  
Unified Algorithm ◽  
Two Dimensional Flows

AbstractNumerical simulations of unsteady gas flows are studied on the basis of Gas-Kinetic Unified Algorithm (GKUA) from rarefied transition to continuum flow regimes. Several typical examples are adopted. An unsteady flow solver is developed by solving the Boltzmann model equations, including the Shakhov model and the Rykov model etc. The Rykov kinetic equation involving the effect of rotational energy can be transformed into two kinetic governing equations with inelastic and elastic collisions by integrating the molecular velocity distribution function with the weight factor on the energy of rotational motion. Then, the reduced velocity distribution functions are devised to further simplify the governing equation for one- and two-dimensional flows. The simultaneous equations are numerically solved by the discrete velocity ordinate (DVO) method in velocity space and the finite-difference schemes in physical space. The time-explicit operator-splitting scheme is constructed, and numerical stability conditions to ascertain the time step are discussed. As the application of the newly developed GKUA, several unsteady varying processes of one- and two-dimensional flows with different Knudsen number are simulated, and the unsteady transport phenomena and rarefied effects are revealed and analyzed. It is validated that the GKUA solver is competent for simulations of unsteady gas dynamics covering various flow regimes.

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