Astrophysical phenomena ranging from supersonic outflows from young stars to pre-runaway burning convection in white dwarfs can be described using fluid hydrodynamic or magnetohydrodynamic models. Despite their basic simplicity, the numerical solution of these models is still a challenge. A reliable description of these phenomena requires a careful representation of the full range of processes present in the astrophysical environment such as sound waves, magnetic viscosity and thermal conductivity which, in turn, yield an enormously wide range of temporal and spatial scales. Resolving such scales is still well beyond modern computational capability. In this work we show that the effects of taking unrealistic physical parameters and correspondingly unrealistic numerical resolution to describe space or time, is very much dependant on the problem being considered. There are cases when reliable results can be achieved, even when important approximations are used to model the environment; the numerical simulation of the emissivity properties of stellar jets is one of them. In other problems, such as burning convection in pre-runaway white dwarfs, poor numerical resolution yields completely different scenarios.
Numerical Simulations in Astrophysics: from Stellar Jets to the White Dwarfs / F. Rubini; L. Del Zanna; J. Biello; J. W. Truran. - STAMPA. - (2007), pp. 83-89. [10.1142/9789812779458_0010]
Numerical Simulations in Astrophysics: from Stellar Jets to the White Dwarfs
RUBINI, FRANCESCO MARIO;DEL ZANNA, LUCA;
2007
Abstract
Astrophysical phenomena ranging from supersonic outflows from young stars to pre-runaway burning convection in white dwarfs can be described using fluid hydrodynamic or magnetohydrodynamic models. Despite their basic simplicity, the numerical solution of these models is still a challenge. A reliable description of these phenomena requires a careful representation of the full range of processes present in the astrophysical environment such as sound waves, magnetic viscosity and thermal conductivity which, in turn, yield an enormously wide range of temporal and spatial scales. Resolving such scales is still well beyond modern computational capability. In this work we show that the effects of taking unrealistic physical parameters and correspondingly unrealistic numerical resolution to describe space or time, is very much dependant on the problem being considered. There are cases when reliable results can be achieved, even when important approximations are used to model the environment; the numerical simulation of the emissivity properties of stellar jets is one of them. In other problems, such as burning convection in pre-runaway white dwarfs, poor numerical resolution yields completely different scenarios.File | Dimensione | Formato | |
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