Igor Ten

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Marilena Greco

Emilian Parau

University of East Anglia

Phillip Wilson

Mateusz Graczyk

Norwegian University of Science and Technology

IIT Madras

Osaka University

University College Dublin

TOUVIA MILOH

Tel Aviv University

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Papers by Igor Ten

Semi-analytical models of hydroelastic sloshing impact in tanks of liquefied natural gas vessels

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2011

The present paper deals with the methods for the evaluation of the hydroelastic interactions that... more The present paper deals with the methods for the evaluation of the hydroelastic interactions that appear during the violent sloshing impacts inside the tanks of liquefied natural gas carriers. The complexity of both the fluid flow and the structural behaviour (containment system and ship structure) does not allow for a fully consistent direct approach according to the present state of the art. Several simplifications are thus necessary in order to isolate the most dominant physical aspects and to treat them properly. In this paper, choice was made of semi-analytical modelling for the hydrodynamic part and finite-element modelling for the structural part. Depending on the impact type, different hydrodynamic models are proposed, and the basic principles of hydroelastic coupling are clearly described and validated with respect to the accuracy and convergence of the numerical results.

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New formulations of the ship-motion Green function

Journal of Engineering Mathematics, 2017

The ship-motion Green function representing the potential flow generated by a time-harmonically p... more The ship-motion Green function representing the potential flow generated by a time-harmonically pulsating source with unit strength advancing beneath a free surface along a straight path at a constant speed is studied in the paper. Starting with the form of a double Fourier integral with respect to wavenumber k and polar angle θ on the Fourier plane, one alternative formulation based on the single integral along dispersion curves for the wave component, and the integrals in polar angle after having evaluated integration in wavenumber, is first presented. Another new formulation based on performing the integral with respect to polar angle θ prior to the wavenumber k is developed afterward. Analytical formulations of the θ-integral defined as g (k) are obtained by applying the theorem of residue. The behaviours of poles located in the integration contour are analyzed, and a method to efficiently evaluate the integral of g (k) for different values of Brard number τ is outlined. Furthermore, numerical calculation is implemented. On comparing with the results obtained by means of the existing formulation, an excellent agreement is achieved with a maximum of difference in the order of 10 −6 which shows that two formulations are intrinsically consistent. The new formulation based on the polar angle integration is shown to be suitable for the study of the spatial integration of the Green function.

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2003A-GS3-2 Hydrodynamic Forces on a Floating Body in a Two-Layer Fluid

Conference Proceedings The Society of Naval Architects of Japan, 2003

Hydrodynamics of a body floating in a two-layer fluid of finite depth(学会賞授賞論文紹介(1))

Bulletin of The Japan Society of Naval Architects and Ocean Engineers, 2007

Creation And Annihilation of Extremely Steep Transient Wave

New Approaches to Gas Condensate Field Development in Uzbekistan

SPE Annual Caspian Technical Conference and Exhibition, 2018

The paper considers new approaches to further development of mature gas-condensate fields, which ... more The paper considers new approaches to further development of mature gas-condensate fields, which are aimed at the maximum recovery of in-place reserves using the systems of horizontal wells. The gas-hydrodynamic simulations on the sector model of a depleted field were performed. Analysis of geological features of the fields of Uzbekistan is crucial to the planning of horizontal wells. As an example of how geological features are taken into account for effective further development of the fields, the reservoirs of Amudarya oil-and-gas basin are described. The questions of geosteering, well targeting along the formation and optimum completion of horizontal and multilateral wells, including with the use of inflow control devices, are addressed. Studies found the appropriateness of the operation of horizontal wells in comparison with vertical wells, which have several technological and economic advantages, such as the cost of such wells, simplified system of surface facilities, producti...

A Semi-Analytical Method With Dissipation for Fluid Resonances

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics, 2012

ABSTRACT A semi-analytical method with dissipation based on the fluid domain decomposition and th... more ABSTRACT A semi-analytical method with dissipation based on the fluid domain decomposition and the expansion of eigenfunctions associated with each domain is developed to analyze the hydrodynamic interaction between floating bodies. The particular cases of moonpool resonance with thin wall (two sides of each wall are “back to back”) and gap resonance with small distance (gap sides of two bodies are “face to face”) are studied with attention on the frequency and amplitude of the fluid resonances.The dissipation is introduced by a drop of the dynamic pressure across the control surfaces proportional to the normal velocity, which play the role of the dissipative surfaces defined in [1].

Simulation of the ocean waves and appearance of Freak waves

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$Research paper thumbnail of Hydrodynamics of a body floating in a two-layer fluid of finite depth. Part 2. Diffraction problem and wave-induced motions$

Hydrodynamics of a body floating in a two-layer fluid of finite depth. Part 2. Diffraction problem and wave-induced motions

Journal of Marine Science and Technology, 2006

A linearized two-dimensional diffraction problem in a two-layer fluid of finite depth was solved ... more A linearized two-dimensional diffraction problem in a two-layer fluid of finite depth was solved for a general floating body and relevant wave-induced motions were studied. In a two-layer fluid, for a prescribed frequency, incident waves propagate with two different wave modes. Thus the wave-exciting forces and resulting motions must be computed separately for each mode of the incident wave. The boundary integral equation method developed by the authors in the Part-1 article was applied to directly obtain the diffraction potential (pressure) on the body surface. With the computed results, an investigation was carried out on the effects of the fluid density ratio and the interface position on the waveexciting forces on the body and the motions of the body, including the case in which the body intersects the interface. By a systematic derivation using Green's theorem, all the possible reciprocity relations were derived theoretically in explicit forms for a system of finite depth; these relations were confirmed to be satisfied numerically with very good accuracy. Experiments were also carried out using water and isoparaffin oil as the two fluids and a Lewis-form body. Measured results for the sway-and heave-exciting forces and the heave motion were compared with the computed results, and a favorable agreement was found.

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The Civil March for Aleppo

The Academy in Exile Book Series, 2020

In the late summer of 2015, record numbers of people sought refuge in Europe, eliciting a wide ra... more In the late summer of 2015, record numbers of people sought refuge in Europe, eliciting a wide range of public responses. Included among these was an initiative that began a year and a half after the record influx of refugees and asylum seekers: The Civil March for Aleppo proposed participants walk from Berlin to Aleppo 'along the so-called "refugee route", just [in] the opposite direction' (Civil March for Aleppo, 2016b). The March passed through Germany,

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$Research paper thumbnail of Radiation And Diffraction Problems of a Floating Body In a Two-Layer Fluid of Finite Depth$

Radiation And Diffraction Problems of a Floating Body In a Two-Layer Fluid of Finite Depth

Semi-analytical models of hydroelastic sloshing impact in tanks of liquefied natural gas vessels

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2011

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New formulations of the ship-motion Green function

Journal of Engineering Mathematics, 2017

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2003A-GS3-2 Hydrodynamic Forces on a Floating Body in a Two-Layer Fluid

Conference Proceedings The Society of Naval Architects of Japan, 2003

Hydrodynamics of a body floating in a two-layer fluid of finite depth(学会賞授賞論文紹介(1))

Bulletin of The Japan Society of Naval Architects and Ocean Engineers, 2007

Creation And Annihilation of Extremely Steep Transient Wave

New Approaches to Gas Condensate Field Development in Uzbekistan

SPE Annual Caspian Technical Conference and Exhibition, 2018

A Semi-Analytical Method With Dissipation for Fluid Resonances

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics, 2012

Simulation of the ocean waves and appearance of Freak waves

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$Research paper thumbnail of Hydrodynamics of a body floating in a two-layer fluid of finite depth. Part 2. Diffraction problem and wave-induced motions$

Hydrodynamics of a body floating in a two-layer fluid of finite depth. Part 2. Diffraction problem and wave-induced motions

Journal of Marine Science and Technology, 2006

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The Civil March for Aleppo

The Academy in Exile Book Series, 2020

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$Research paper thumbnail of Radiation And Diffraction Problems of a Floating Body In a Two-Layer Fluid of Finite Depth$

Radiation And Diffraction Problems of a Floating Body In a Two-Layer Fluid of Finite Depth

Igor Ten

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