scholarly journals Comparison of Radio Observations and Numerical Simulations of the Radio Lobes of Cygnus A

2005 ◽  
Vol 620 (1) ◽  
pp. 126-144 ◽  
Author(s):  
Joel C. Carvalho ◽  
Ruth A. Daly ◽  
Matthew P. Mory ◽  
Christopher P. O’Dea
Keyword(s):  
Numerical Simulations ◽  
Radio Observations ◽  
Cygnus A

scholarly journals Magnetogenesis and the Cosmic Web: A Joint Challenge for Radio Observations and Numerical Simulations

Galaxies ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 109
Author(s):  
Franco Vazza ◽  
Nicola Locatelli ◽  
Kamlesh Rajpurohit ◽  
Serena Banfi ◽  
Paola Domínguez-Fernández ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Radio Signal ◽  
Radio Observations ◽  
Definitive Answer ◽  
Physical Connection ◽  
The Status ◽  
Radio Frequencies

The detection of the radio signal from filaments in the cosmic web is crucial to distinguish possible magnetogenesis scenarios. We review the status of the different attempts to detect the cosmic web at radio wavelengths. This is put into the context of the advanced simulations of cosmic magnetism carried out in the last few years by our MAGCOW project. While first attempts of imaging the cosmic web with the MWA and LOFAR have been encouraging and could discard some magnetogenesis models, the complexity behind such observations makes a definitive answer still uncertain. A combination of total intensity and polarimetric data at low radio frequencies that the SKA and LOFAR2.0 will achieve is key to removing the existing uncertainties related to the contribution of many possible sources of signal along deep lines of sight. This will make it possible to isolate the contribution from filaments, and expose its deep physical connection with the origin of extragalactic magnetism.

Multifrequency radio observations of Cygnus A - Spectral aging in powerful radio galaxies

1991 ◽  
Vol 383 ◽  
pp. 554 ◽  
Author(s):  
C. L. Carilli ◽  
R. A. Perley ◽  
J. W. Dreher ◽  
J. P. Leahy
Keyword(s):  
Radio Galaxies ◽  
Powerful Radio ◽  
Radio Observations ◽  
Cygnus A

scholarly journals Multiwavelength study of Cygnus A - I. Precession and slow jet speeds from radio observations

2008 ◽  
Vol 388 (4) ◽  
pp. 1457-1464 ◽  
Author(s):  
Katrien C. Steenbrugge ◽  
Katherine M. Blundell
Keyword(s):  
Radio Observations ◽  
Cygnus A

Direct Numerical Simulations of Gas–Liquid Multiphase Flows

2001 ◽  
Author(s):  
Grétar Tryggvason ◽  
Ruben Scardovelli ◽  
Stéphane Zaleski
Keyword(s):  
Numerical Simulations ◽  
Multiphase Flows ◽  
Direct Numerical Simulations

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

SYNCHROTRON-BASED TRANSMISSION X-RAY MICROSCOPY: A TOOL FOR THREE-DIMENSIONAL SPECTROSCOPIC IMAGING AND NUMERICAL SIMULATIONS

2016 ◽  
Vol 19 (1) ◽  
pp. 127-158 ◽  
Author(s):  
Matthew B. DeGostin ◽  
Alex P. Cocco ◽  
Wilson K. S. Chiu
Keyword(s):  
Numerical Simulations ◽  
Three Dimensional ◽  
Spectroscopic Imaging ◽  
X Ray

CHARACTERIZATION OF SPLASH-PLATE ATOMIZERS USING NUMERICAL SIMULATIONS

2007 ◽  
Vol 17 (4) ◽  
pp. 347-380 ◽  
Author(s):  
Mohammad P. Fard ◽  
Denise Levesque ◽  
Stuart Morrison ◽  
Nasser Ashgriz ◽  
J. Mostaghimi
Keyword(s):  
Numerical Simulations

NUMERICAL SIMULATIONS OF MHD FLUID FLOW AND HEAT TRANSFER IN A LID-DRIVEN CAVITY AT HIGH HARTMANN NUMBERS

2012 ◽  
Vol 43 (5) ◽  
pp. 383-404
Author(s):  
Dipin Kalapurakal ◽  
Abhilash Chandy
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Simulations ◽  
Driven Cavity ◽  
Flow And Heat Transfer
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