Studying the effects of gas-surface interaction models in rarefied is very important for reentry ... more Studying the effects of gas-surface interaction models in rarefied is very important for reentry flights. Gas-surface interaction effects play an important role in rarefied gas dynamics modelling by the direct simulation Monte Carlo (DSMC) method. In the present work, gas-surface interaction models (Maxwell and Cercignani-Lampis-Lord) are described. In rarefied hypersonic flows applying these models have been carried out in a wide range of the momentum and energy accommodation coefficients. In this paper also presented the comparison of the calculation results for reentry vehicles.
Experimental determination of aerodynamic data for high altitudes is difficult not only with tech... more Experimental determination of aerodynamic data for high altitudes is difficult not only with technical, but also from an economic point of view. Therefore, the main tools for the study of aerodynamic characteristics of re-entry vehicles are numerical methods of rarefied gas dynamics. The development of numerical methods in rarefied gas dynamics is primarily due to the use of direct simulation method (Monte Carlo). In this paper present algorithm of the Monte Carlo method and the various gas-surface interaction models. The results of the aerodynamic characteristics of re-entry vehicles obtained by Monte Carlo method at different gas-surface interaction models are described.
Nowadays, there are various ways to study gas and fluid flows in wind tunnels and are still an im... more Nowadays, there are various ways to study gas and fluid flows in wind tunnels and are still an important field of scientific research. The objectives of the research intended to present the basic principle of flow visualization techniques in wind tunnels and to simulate, visualize, observe, and measure how the flow around the object.
The influence of boundary condition of the bodies with gas flows is one of the most important pro... more The influence of boundary condition of the bodies with gas flows is one of the most important problems in high-altitude aerodynamics. In this paper presents the results of the calculation of aerodynamic characteristics of aerospace vehicle using Monte-Carlo method based on three different gas-surface interaction models – Maxwell model, Cercignani-Lampis-Lord (CLL) model and Lennard-Jones (LJ) potential. These models are very sensitive for force and moment coefficients of aerospace vehicle in the hypersonic free molecular flow. The models, method and results can be used for new generation aerospace vehicle design.
The most significant problems of numerical schemes development, arising from specific problems of... more The most significant problems of numerical schemes development, arising from specific problems of aeroacoustics are formulated. In this paper emphasized the necessity for the standard achievement, in which it is possible to test proposed scheme. The most reliable standard may be exact solution about propagation of sound in formulation approximate to consider the problem. In the work presents exact solution of acoustic radiation from two dimensional channels by Wiener-Hopf method.
Studying the effects of gas-surface interaction models in rarefied is very important for reentry ... more Studying the effects of gas-surface interaction models in rarefied is very important for reentry flights. Gas-surface interaction effects play an important role in rarefied gas dynamics modelling by the direct simulation Monte Carlo (DSMC) method. In the present work, gas-surface interaction models (Maxwell and Cercignani-Lampis-Lord) are described. In rarefied hypersonic flows applying these models have been carried out in a wide range of the momentum and energy accommodation coefficients. In this paper also presented the comparison of the calculation results for reentry vehicles.
Experimental determination of aerodynamic data for high altitudes is difficult not only with tech... more Experimental determination of aerodynamic data for high altitudes is difficult not only with technical, but also from an economic point of view. Therefore, the main tools for the study of aerodynamic characteristics of re-entry vehicles are numerical methods of rarefied gas dynamics. The development of numerical methods in rarefied gas dynamics is primarily due to the use of direct simulation method (Monte Carlo). In this paper present algorithm of the Monte Carlo method and the various gas-surface interaction models. The results of the aerodynamic characteristics of re-entry vehicles obtained by Monte Carlo method at different gas-surface interaction models are described.
Nowadays, there are various ways to study gas and fluid flows in wind tunnels and are still an im... more Nowadays, there are various ways to study gas and fluid flows in wind tunnels and are still an important field of scientific research. The objectives of the research intended to present the basic principle of flow visualization techniques in wind tunnels and to simulate, visualize, observe, and measure how the flow around the object.
The influence of boundary condition of the bodies with gas flows is one of the most important pro... more The influence of boundary condition of the bodies with gas flows is one of the most important problems in high-altitude aerodynamics. In this paper presents the results of the calculation of aerodynamic characteristics of aerospace vehicle using Monte-Carlo method based on three different gas-surface interaction models – Maxwell model, Cercignani-Lampis-Lord (CLL) model and Lennard-Jones (LJ) potential. These models are very sensitive for force and moment coefficients of aerospace vehicle in the hypersonic free molecular flow. The models, method and results can be used for new generation aerospace vehicle design.
The most significant problems of numerical schemes development, arising from specific problems of... more The most significant problems of numerical schemes development, arising from specific problems of aeroacoustics are formulated. In this paper emphasized the necessity for the standard achievement, in which it is possible to test proposed scheme. The most reliable standard may be exact solution about propagation of sound in formulation approximate to consider the problem. In the work presents exact solution of acoustic radiation from two dimensional channels by Wiener-Hopf method.
At the end of XX and the beginning of XXI centuries, the unit cost of delivering the payload into... more At the end of XX and the beginning of XXI centuries, the unit cost of delivering the payload into low earth orbit for non-reusable and reusable carrier of the U.S. and Western Europe is approximately 10 000-25 000 $/kg. Using the new generation expendable launch system type of “Atlas V”, “Delta IV” and “Ariane 5” should lead to some reduction in the unit cost of launch, but, as expected, not too significant. The cost of a launch by “Soyuz” and “Proton” is 2100-2400 $/kg, respectively. Nevertheless, further reducing the cost of delivering the payloads into orbit associated with reusable hypersonic aircraft's.
A new space transportation system being developed could make a trip to the geostationary earth orbit daily event and to transform the global economy. Theoretically, the most benefit from an economic point of view, to deliver the payloads and the passengers into the space is the Russian idea “Space Elevator”.
This book presents the historical overview of the development of the reusable hypersonic aircraft systems. Methods to predict aerothermodynamic characteristics for hypersonic aircrafts and application of cognitive approach in computational aerodynamics are offered. The basic principles of hypersonic propulsion systems: rocket engines, turbofan, turbojet, ramjet, scramjet and the dual-combustion ramjet are explained. The book also highlighted that we need to consider medico-biological effect and to improve biological and medical system for human in space flight due to future space exploration plans to deliver manned spacecrafts with crews to the Moon and Mars.
Uploads
Papers by Zay Yar Myo Myint
A new space transportation system being developed could make a trip to the geostationary earth orbit daily event and to transform the global economy. Theoretically, the most benefit from an economic point of view, to deliver the payloads and the passengers into the space is the Russian idea “Space Elevator”.
This book presents the historical overview of the development of the reusable hypersonic aircraft systems. Methods to predict aerothermodynamic characteristics for hypersonic aircrafts and application of cognitive approach in computational aerodynamics are offered. The basic principles of hypersonic propulsion systems: rocket engines, turbofan, turbojet, ramjet, scramjet and the dual-combustion ramjet are explained. The book also highlighted that we need to consider medico-biological effect and to improve biological and medical system for human in space flight due to future space exploration plans to deliver manned spacecrafts with crews to the Moon and Mars.