Three-Dimensional Numerical Simulation of the Development of Instability of a Contact Boundary of Colliding Metal Plates within the Gas-Dynamic Approximation

2019 ◽  
Vol 57 (2) ◽  
pp. 236-241
Author(s):  
S. V. Fortova ◽  
P. S. Utkin ◽  
T. S. Kazakova
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Contact Boundary ◽  
Gas Dynamic ◽  
Metal Plates ◽  
Dynamic Approximation

scholarly journals NUMERICAL SIMULATION OF UNSTABLE MODES FOR A SAFETY VALVE

2020 ◽  
pp. 141-157
Author(s):  
Raeder T. ◽  
◽  
Tenenev V.A. ◽  
Chernova A.A. ◽  
◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Safety Valve ◽  
Computing Time ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Cfd Modeling ◽  
Dimensional Structure ◽  
Main Work ◽  
Gas Dynamic ◽  
Valve Operation

When designing pressure regulators, one needs to have a complete understanding of gasdynamic processes. The numerical algorithm for three-dimensional gas-dynamic modeling of a full cycle of spring safety valve operation is proposed, which allows one to significantly reduce the computing time. Grid reconfiguration during CFD modeling is provided by interpolation procedure using previously calculated grids. Calculations show that gas-dynamic numerical simulation should account for a three-dimensional structure of the unsteady flow and the motion of the disc. These factors are taken into account when calculating full cycle of the valve on a coarse grid with the use of correction functions for the force and flow characteristics of the valve. The correction functions are calculated by the false transient method in the three-dimensional formulation. Cyclograms of the valve operation demonstrate satisfactory agreement of the experimental and numerical simulation results. The agreement in the variation of gas-dynamic forces with time is observed, except for the transitional regime before the valve starts to close. In the main work area, the calculated values of the reduced force belong to a confidence interval.

scholarly journals Numerical simulation of the interaction between combustion products of a cartridge pressure accumulator and oxygen in the launch container

2019 ◽  
pp. 68-73
Author(s):  
R. A. Peshkov ◽  
D. R. Ismagilov
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Combustion Products ◽  
Computational Domain ◽  
Two Dimensional ◽  
Dynamic Parameters ◽  
Gas Dynamic ◽  
Three Dimensional Models ◽  
Main Components ◽  
Research Show

The paper introduces a mathematical model for calculating the gas-dynamic parameters in the launch container. The model takes into account chemical interactions between the main components of the combustion products, i.e. carbon monoxide and hydrogen, and oxygen. The resulting energy can be used to increase the initiating pulse of the rocket. Within the research, we described the basic requirements for the grid model, and analyzed the accuracy of the results obtained. Furthermore, we compared calculation data of pressure in the launch container with the results of the known method. Findings of research show that the use of two-dimensional and three-dimensional models makes it possible to obtain not only medium-volume gas-dynamic parameters, such as pressure, temperature, density, but also the distribution of these parameters over the computational domain. The developed method of numerical simulation will allow us to estimate the effect of changes in the configuration of the sub-rocket volume and other parameters on the dynamics of the rocket movement without conducting an expensive experiment

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

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