Numerical simulations of stochastically excited sound waves in a random medium

A Dynamic Interstellar Medium: Recent Numerical Simulations

Recent numerical simulations of the interstellar medium driven by energy input from supernovae and stellar winds indicate that H I clouds can be formed by compression in shock waves and colliding turbulent streams without any help from thermal and gravitational instabilities. The filling factor of the hot phase in these models does not exceed 20–40% at the midplane. The hot gas is involved in a...

Numerical Simulation of Random Irregular Waves for Wave Generation in Laboratory Flumes

Understanding of wave hydrodynamics and its effects are important for engineers and scientists. Important insights may be gained from laboratory studies.  Often the waves are simulated in laboratory flumes do not have the full characteristics of real sea waves. It is then necessary to present reliable methods of wave generation in wave flumes.  In this paper, the results of numerically simulate...

numerical simulations of spilling breaking waves

Numerical Simulations of the Intergalactic Medium

The intergalactic medium at redshifts 2–6 can be studied observationally through the absorption features it produces in the spectra of background quasars. Most of the UV-absorption lines arise in mildly overdense regions, which can be simulated reliably with current hydrodynamical simulations. Comparison of observed and simulated spectra allows one to put contraints on the model’s parameters.

Sound waves in the intracluster medium of the Centaurus cluster

We report the discovery of ripple-like X-ray surface brightness oscillations in the core of the Centaurus cluster of galaxies, found with 200 ks of Chandra observations. The features are between 3 to 5 per cent variations in surface brightness with a wavelength of around 9 kpc. If, as has been conjectured for the Perseus cluster, these are sound waves generated by the repetitive inflation of ce...