Time filter

Source Type

Bondarenko A.V.,National University of Shipbuilding
RINA, Royal Institution of Naval Architects - Design and Operation of Wind Farm Support Vessels 2015, Papers | Year: 2015

The data considering wind farm support vessels (WFSV) has been collected. The basic tasks executable by these vessels as well as the key factors taken into account at their design, are distinguished. The diagrams of distribution of vessels on hull material, speed, number of technicians, type of propulsion are built. The basic structural features of vessels are considered. Such basic hull forms of WFSV as monohull, catamarans, SWATH, trimarans and their different varieties are studied. The dependences are got for determination of principal particulars of vessels on the initial stages design for the catamarans. The trends of development of WFSV are shown.. © 2015: The Royal Institution of Naval Architects.


Serbin S.I.,National University of Shipbuilding | Matveev I.B.,Applied Plasma Technology
IEEE Transactions on Plasma Science | Year: 2010

Theoretical investigations of the working processes in a plasma coal pilot gasification system have been conducted. The obtained results and recommendations can be used for modeling the operational modes of plasma gasification system, as well as geometry optimization, and the engineering design of prospective power generation units. © 2006 IEEE.


Ushcats M.V.,National University of Shipbuilding
Physical Review Letters | Year: 2012

The well-known problem of the virial expansion low-density limitation is considered within Mayer's cluster expansion method. The expression for the configuration integral and the corresponding equation of state are presented based on this approach but not limited by the convergence radius of the series for density and activity. When taking into account any number of irreducible integrals at the thermodynamic limit, this equation of state demonstrates the exact coincidence with the virial one inside the domain of its convergence but specifies the condensation process directly outside that domain. Thus, the assumption of some researchers that the condensation should appear in the domain where the proof of the virial expansion is limited may now be regarded as confirmed, exclusively using the classical Gibbs statistics. © 2012 American Physical Society.


Ushcats M.V.,National University of Shipbuilding
Journal of Chemical Physics | Year: 2013

An accurate expression for the cluster expansion of the configuration integral has been considered based on the Gibbs single-phase approach without additional assumptions and approximations. The computational results for the Lennard-Jones fluid demonstrate the beginning of the condensation process at the singularity points of the isothermal compressibility. It has also been shown that the accuracy boundary of the virial equation of state corresponds to these points, not the virial series singularities. At the high density regime, the inappropriate behavior of the cluster expansion has been discovered that may be related to the infinite limits of the cluster integrals, i.e., their independency on the density. © 2013 American Institute of Physics.


Ushcats M.V.,National University of Shipbuilding
Journal of Chemical Physics | Year: 2014

The modified Lennard-Jones potential, which simplifies the numerical simulations and maintains the realistic behavior of its parent, is proposed to a role of the standard interaction model for both the experimental and theoretical studies. The virial coefficients of this model up to the seventh order have been calculated for the range of temperatures kT/E = 0.3-70. In the computations, a technique has been used, that combines the quadrature integration and Mayer Sampling Monte Carlo method (MSMC). Unlike the original MSMC, this technique does not require the reference coefficients of another potential and can be used in a wide range of temperatures for various interaction models. © 2014 AIP Publishing LLC.


Moonesun M.,National University of Shipbuilding
Journal of Taiwan Society of Naval Architects and Marine Engineers | Year: 2014

This paper introduces and describes Iranian hydrodynamic series of submarines (IHSS) and for describing this series the submarine geometry and non-dimensional ratios are described. IHSS is a new Simple and useful instrument for hydrodynamic design of submarine that is introduced in this paper for first time. Standard series for ships and boats have been very common and applicable such as Series 60, Series 62 and Series 64, but for describing the hull of submarine there have not ever been any series. IHSS uses a special 15 digit code for each submarine hull and each code generally describes the geometry. The manner of this coding is presented in this paper. The main advantage of IHSS compared to other standard series is the presentation of hydrodynamic characteristics such as hydrodynamic coefficients for designing and calculating the maneuvering and resistance. Because of that, IHSS is named a hydrodynamic series. The main basis of this series for providing hydrodynamic characteristics is CFD method but in some cases the physical model test results will be used to validation of the results. In this paper only the general discussions about IHSS and coding are presented and the hydrodynamic results will be present in next papers. For providing general application of this series for all arbitrary tonnages and dimensions, descriptions of geometries are, firstly based on non-dimensional ratios and secondly, the geometries are considered as simple as possible so that the designers can select initial geometry from IHSS as a base and then the variations can be applied on it. Basis of submarine shape in IHSS is parallel middle body shape because the most usual shapes of today's submarines are such. The end part is conical without propeller, and the bow is elliptical.


Ushcats M.V.,National University of Shipbuilding
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

The limits for the accuracy of the virial expansion and the problem of its divergence have been investigated using the exact cluster expansion of the configuration integral. In the subcritical temperature regimes the virial equation of state is applicable up to the singularity point of the isothermal compressibility, i.e., to the possible beginning of the condensation process. At supercritical temperatures this equation should be applicable within the region where the cluster expansion is adequate. The problem of the virial series divergence has been found to be irrelevant to the actual behavior of the cluster expansion. Considering the Lennard-Jones fluid as well as the system of hard spheres, the inadequate behavior of the cluster expansion has been discovered in the high density regime. The major reason for this inadequacy should be the basic simplification of the cluster expansion: the integration of irreducible diagrams over the infinite limits. © 2013 American Physical Society.


Ushcats M.V.,National University of Shipbuilding
Ukrainian Journal of Physics | Year: 2014

A modified Lennard-Jones potential with a finite interaction radius, which maintains the realistic behavior of its parent and greatly simplifies the numerical simulation of high-density thermodynamic systems, has been considered. The virial coefficients of this potential have been calculated up to the fifth order, inclusive, in a wide range of temperatures. The modified potential can be applied not only in numerical experiments but also in theoretical studies. It is proposed as a reference model to test the adequacy of various theoretical and experimental approaches. © M.V. USHCATS, 2014.


Ushcats M.V.,National University of Shipbuilding
Ukrainian Journal of Physics | Year: 2014

A technique for the calculation of high-order virial coefficients, which combines the quadrature integration and the Mayer sampling Monte Carlo method (MSMC), is proposed. Unlike the original MSMC, this technique does not require to know the reference coefficients for the hardsphere potential and can be used in a wide range of temperatures and for various interaction potentials. In addition, the proposed method has a higher accuracy at lower computational costs. It has been used to obtain some new data on the seventh virial coefficient of the Lennard- Jones (12-6) model. © M.V. USHCATS, 2014.


Ushcats M.V.,National University of Shipbuilding
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2015

For the lattice gas models of arbitrary geometry and dimensions with absolute repulsion between particles at zero distance (a hard core identical to a single lattice site) and arbitrary repulsion or attraction at other distances, the "hole-particle" symmetry of the system potential energy has been stated and an equation of state has been derived on the basis of the classical Gibbs statistics. The equation is completely analogous to the well-known virial equation of state, except that it is more accurate at high-density states, while the virial equation has the low-density limitation. Both equations contain the common set of the so-called irreducible integrals, related to the corresponding virial coefficients, and can be used together to describe the behavior of a lattice gas in a wide range of densities. ©2015 American Physical Society.

Loading National University of Shipbuilding collaborators
Loading National University of Shipbuilding collaborators