dorsal/arxiv
View SchemaPiecewise continuous distribution function method: Fluid equations and wave disturbances at stratified gas
| Authors | Dmitry Vereshchagin, Sergey Leble |
|---|---|
| Categories | |
| ArXiv ID | physics/0503233 |
| URL | https://arxiv.org/abs/physics/0503233 |
| DOI | 10.1016/j.jastp.2006.05.003 |
Abstract
Wave disturbances of a stratified gas are studied. The description is built on a basis of the Bhatnagar -- Gross -- Krook (BGK) kinetic equation which is reduced down the level of fluid mechanics. The double momenta set is introduced inside a scheme of iterations of the equations operators, dividing the velocity space along and opposite gravity field direction. At both half-spaces the local equilibrium is supposed. As the result, the momenta system is derived. It reproduce Navier-Stokes and Barnett equations at the first and second order in high collision frequencies. The homogeneous background limit gives the known results obtained by direct kinetics applications by Loyalka and Cheng as the recent higher momentum fluid mechanics results of Chen, Rao and Spiegel. The ground state declines from exponential at the Knudsen regime. The WKB solutions for ultrasound in exponentially stratified medium are constructed in explicit form, evaluated and plotted.
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"abstract": "Wave disturbances of a stratified gas are studied. The description is built\non a basis of the Bhatnagar -- Gross -- Krook (BGK) kinetic equation which is\nreduced down the level of fluid mechanics. The double momenta set is introduced\ninside a scheme of iterations of the equations operators, dividing the velocity\nspace along and opposite gravity field direction. At both half-spaces the local\nequilibrium is supposed. As the result, the momenta system is derived. It\nreproduce Navier-Stokes and Barnett equations at the first and second order in\nhigh collision frequencies. The homogeneous background limit gives the known\nresults obtained by direct kinetics applications by Loyalka and Cheng as the\nrecent higher momentum fluid mechanics results of Chen, Rao and Spiegel. The\nground state declines from exponential at the Knudsen regime. The WKB solutions\nfor ultrasound in exponentially stratified medium are constructed in explicit\nform, evaluated and plotted.",
"arxiv_id": "physics/0503233",
"authors": [
"Dmitry Vereshchagin",
"Sergey Leble"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1016/j.jastp.2006.05.003",
"title": "Piecewise continuous distribution function method: Fluid equations and wave disturbances at stratified gas",
"url": "https://arxiv.org/abs/physics/0503233"
},
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