Possibility of an unequivocal test of different models of the equation of state of aluminum in the coupling regime GÈ1–50
نویسندگان
چکیده
The equation of state ~EOS! in regimes of density (r) and temperature ~T! which are inaccessible to experiment has to be determined using theories which may themselves be out of their range of validity. Even for Al, the EOS in the region 0.1,r,2 g cm, and 1,T,50 eV, where the ionic coupling parameter G ranges from 1 –;50, is not unknown. We present results for the EOS using the Thomas-Fermi model ~TF!, the quotidian equation of state, the Sesame tabulation, and using the density-functional neutral-pseudoatom ~NPA! model which is a first-principles theory applicable at strong coupling. It is found that the NPA predictions are very different from the other models, and experiments could provide an unequivocal test of the validity of the different EOS models. We report theoretical results for the Hugoniot, and the electrical conductivity in the regime of interest.
منابع مشابه
بکارگیری مدل های مختلف کوپل شدگی سیال - جسم برای بررسی مشخصه های ارتعاشی در ناحیه قفل شدگی
In this paper, several models of structure-fluid coupling are employed to investigate on the vibration behavior of the structure. Using basic equations of vibration and employing a mathematical model, a single degree of freedom system is analyzed. Some parameters of the mathematical model are obtained from test. To examine structure-flow interaction, coupled system of nonlinear second-order dif...
متن کاملU-Bending Analysis with an Emphasis on Influence of Hardening Models
In this paper the effect of different hardening models in simulating the U-bending process for AA5754-O and DP-Steel, taking a benchmark of NUMISHEET 93 2-D draw bending, has been discussed. The hardening models considered in simulations are: isotropic hardening, pure (linear) kinematic hardening and combined (nonlinear kinematic) hardening. The influence of hardening models on predicting sprin...
متن کاملTurbulent Flow over Cars
In this paper the flow behaviour over a number of car bodies is studied. For this purpose the unsteady 2-D incompressible Navier-Stokes equations have been applied. After averaging and nondimensionalizing the equations, the system of equations has been transformed from the Cartesian (x-y) coordinates to a body fitted generalized (-) coordinate. As the flow is incompressible, the density in the ...
متن کاملForecasting Crude Oil prices Volatility and Value at Risk: Single and Switching Regime GARCH Models
Forecasting crude oil price volatility is an important issues in risk management. The historical course of oil price volatility indicates the existence of a cluster pattern. Therefore, GARCH models are used to model and more accurately predict oil price fluctuations. The purpose of this study is to identify the best GARCH model with the best performance in different time horizons. To achieve th...
متن کاملRelativistic Stellar Models with Quadratic Equation of State
In this paper, we have obtained and presented new relativistic stellar configurations considering an anisotropic fluid distribution with a charge distribution and a gravitational potential Z(x) that depends on an adjustable parameter. The quadratic equation of state based on Feroze and Siddiqui viewpoint is used for the matter distribution. The new solutions can be written in terms of elementar...
متن کامل