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Wyświetlanie 1-2 z 2
Tytuł:
Study of continuous phase transition with Toom cellular automata
Autorzy:
Makowiec, D.
Powiązania:
https://bibliotekanauki.pl/articles/1941716.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
equilibrium lattice model
equilibrium lattice systems
critical components
Gibbsian measures
Ising model
Opis:
The heuristic proof, based on computer simulation investigations, is presented that though stationary Toom cellular automata exhibit many features which are characteristic for an equilibrium system (e.g. rapid change in the order parameter, when noise is fine tuned, or slow decay of the two point correlation function), the stationary state is not Gibbsian. It means that it is impossible to define energy on the microscopic level in such a way that the dynamic system becomes representative of some equilibrium lattice model. Moreover, properties on the coarse-grained level: fluctuations, seem to be distinct from the corresponding ones of the Ising model.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 19-31
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of addition of carbon nanotubes on rheological properties of selected liquid lubricants - a computer simulation study
Autorzy:
Chopra, Anjali
Winczewski, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/1954594.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska
Tematy:
nanotechnology
tribology
lubricants
rheology
propylene glycol
carbon nanotubes
non-equilibrium molecular dynamics
nanotechnologia
tribologia
smary
reologia
glikol propylenowy
nanorurki
nierównowagowa dynamika molekularna
Opis:
This work is motivated by the improvement of anti-friction properties of lubricants by addition of CNTs proved experimentally in literature. In particular, a methodology is developed to compute the shear viscosity of liquid lubricants (Propylene Glycol) based on Molecular Dynamics simulation. Non-Equilibrium molecular dynamics (NEMD) approach is used with a reactive force field ReaxFF implemented in LAMMPS. The simulations are performed using the canonical (NVT) ensemble with the so-called SLLOD algorithm. Couette flow is imposed on the system by using Lees-Edwards periodic boundary conditions. Suitable parameters such as simulation time and imposed shear velocity are obtained. Using these parameters, the influence of addition of 27 wt% CNTs to Propylene Glycol on its viscosity is analyzed. Results show that 3.2 million time-steps with a 0.1 fs time-step size is not sufficient for the system to reach equilibrium state for such calculations. With the available computational resources, a shear velocity of 5 × 10−5 Å/fs was observed to give viscosity value with approximately 43% error as compared to the experimental value. Moreover, the lubricant exhibited a shear thinning behaviour with increasing shear rates. CNTs enhanced the lubricant's viscosity by 100-190% depending upon the averaging method used for calculation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2020, 24, 4; 345-388
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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