The Dynamics of Sinking Satellites around Disk Galaxies: A Poor Man’s Alternative to High‐Resolution Numerical Simulations

AbstractIn this talk, I will present the result of high resolution numerical simulations of disk galaxies with various bulge/disk ratios evolving isolated, showing that: •Most of migration takes place when the bar strength is high and decreases in the phases of low activity (in agreement with the results by Brunetti et el. 2011, Minchev et al. 2011).•Most of the stars inside the corotation radius (CR) do not migrate in the outer regions, but stay confined in the inner disk, while stars outside CR can migrate either inwards or outwards, diffusing over the whole disk.•Migration is accompanied by significative azimuthal variations in the metallicity distribution, of the order of 0.1 dex for an initial gradient of ~-0.07 dex/kpc.•Boxy bulges are an example of stellar structures whose properties (stellar content, vertical metallicity, [α/Fe] and age gradients, ..) are affected by radial migration (see also Fig. 1).

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Turbulence Fine Structure, Intermittency, and Large-Scale Interactions in the Stable Boundary Layer and Residual Layer: Correlative High-Resolution Measurements and Direct Numerical Simulations

10.21236/ada627247 ◽

2014 ◽

Author(s):

David C. Fritts ◽

Ben B. Balsley ◽

Dale A. Lawrence

Keyword(s):

Boundary Layer ◽

Fine Structure ◽

High Resolution ◽

Numerical Simulations ◽

Stable Boundary Layer ◽

Large Scale ◽

Direct Numerical Simulations ◽

Residual Layer ◽

Stable Boundary ◽

Scale Interactions

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Rip current evidence by hydrodynamic simulations, bathymetric surveys and UAV observation

10.5194/nhess-2017-53 ◽

2017 ◽

Cited By ~ 1

Author(s):

Guido Benassai ◽

Pietro Aucelli ◽

Giorgio Budillon ◽

Massimo De Stefano ◽

Diana Di Luccio ◽

...

Keyword(s):

Grain Size ◽

High Resolution ◽

Numerical Simulations ◽

Current System ◽

Current Evidence ◽

Rip Current ◽

Rip Currents ◽

Transport Pathways ◽

Fine Sediments ◽

Scientific Challenge

Abstract. The prediction of the formation, spacing and location of rip currents is a scientific challenge that can be achieved by means of different complementary methods. In this paper the analysis of numerical and experimental data, including UAV observation, allowed to detect the presence of rip currents and rip channels at the mouth of Sele river, in the Gulf of Salerno, southern Italy. The dataset used to analyze these phenomena consisted of two different bathymetric surveys, a detailed sediment 5 analysis and a set of high-resolution wave numerical simulations, completed with satellite and UAV observation. The grain size trend analysis and the numerical simulations allowed to identify the rip current system, forced by topographically constrained channels incised on the seabed, which were detected by high resolution bathymetric surveys. The study evidenced that on the coastal area of the Sele mouth grain-size trends are controlled by the contribution of fine sediments, which exhibit suspended transport pathways due to rip currents and longshore currents. The results obtained were confirmed by satellite and UAV 10 observations in different years.

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Secure and Efficient Framework for High-Resolution, Short-Term Numerical Simulations of Weather Phenomena on Mobile Platforms

2015 20th International Conference on Control Systems and Computer Science ◽

10.1109/cscs.2015.120 ◽

2015 ◽

Author(s):

Adelina Vidovici ◽

Razvan Dobre ◽

Emil-Ioan Slusanschi ◽

Rodica Dumitrache

Keyword(s):

High Resolution ◽

Numerical Simulations ◽

Mobile Platforms ◽

Short Term

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High-resolution Numerical Simulations of Shock-diffraction Induced Vorticity Generation in Cylindrical Cavities

Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019) ◽

10.3850/978-981-11-2730-4_0349-cd ◽

2019 ◽

Author(s):

N. Brahmi ◽

A. Hadjadj

Keyword(s):

High Resolution ◽

Numerical Simulations ◽

Shock Diffraction ◽

Vorticity Generation ◽

Cylindrical Cavities

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Dynamical Friction in Disk Galaxies: The Radial Dependence

International Astronomical Union Colloquium ◽

10.1017/s0252921100050053 ◽

1996 ◽

Vol 157 ◽

pp. 372-374

Author(s):

Mattias Wahde ◽

Karl Johan Donner

Keyword(s):

Numerical Simulations ◽

Decay Time ◽

Circular Orbit ◽

Simple Formula ◽

Radial Dependence ◽

Disk Galaxies ◽

Dynamical Friction ◽

Satellite Galaxy ◽

Parent Galaxy ◽

Good Agreement

AbstractA simple formula is derived for the force of dynamical friction acting on a satellite galaxy which is moving on a nearly circular orbit around its parent galaxy. Using this formula, estimates of the decay time are computed. The results are then compared with the corresponding results from numerical simulations, and are found to be in good agreement.

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