scholarly journals The influence of the layout features of the trimaran hull on its hydrodynamic resistance

2021 ◽  
pp. 37-41
Author(s):  
А.Э. Корепанов
Keyword(s):  
Froude Number ◽  
Test Data ◽  
Model Test ◽  
Central Body ◽  
The State ◽  
Hydrodynamic Resistance ◽  
Current Trends

В статье отражена история, состояние развития и сложившаяся тенденция применения аутригеров. Показано как сформировалась терминология по судам данного типа. В статье затронута тема влияния расположения аутригеров на гидродинамическое сопротивление тримарана. Целью работы является получение методики для нахождения гидродинамического сопротивления тримарана. Состояние данного вопроса на сегодня недостаточно изучено т.к. нет четкого ответа при какой схеме по длине и ширине судна необходимо располагать аутригеры для того, чтобы судно могло включить в себя все возможные положительные качества. На основании анализа полученных данных модельных испытаний были построены графики зависимости гидродинамического сопротивления от числа Фруда которые показывают влияние расположения аутригеров по длине и ширине относительно центрального корпуса на гидродинамическое сопротивление тримарана. Сделаны выводы о влиянии размеров аутригеров и их расположения относительно центрального корпуса тримарана на его гидродинамическое сопротивление. The article reflects the history, state of development and current trends in the use of outriggers. It is shown how the terminology for vessels of this type was formed. The article touches on the topic of the influence of the location of outriggers on the hydrodynamic resistance of the trimaran. The aim of the work is to obtain a methodology for determining the hydrodynamic resistance of a trimaran. The state of this issue has not been sufficiently studied to date, since there is no clear answer according to which scheme for the length and width of the vessel it is necessary to place outriggers so that the vessel includes all possible positive qualities. Based on the analysis of the obtained model test data, graphs of the dependence of hydrodynamic resistance on the Froude number were constructed, which show the influence of the location of outriggers along the length and width relative to the central body on the hydrodynamic resistance of the trimaran. Conclusions are drawn about the influence of the size of outriggers and their location relative to the central body of the trimaran on its hydrodynamic resistance.

ESPORTS TOURNAMENTS AS A FORM OF STRATEGIC PROMOTION OF PRODUCTS AND SERVICES

2020 ◽  
Vol 2 (7) ◽  
pp. 19-23
Author(s):  
V. V. VELIKOROSSOV ◽  
◽  
Yu. M. BRYUKHANOV ◽  
A. O. TITOVA ◽  
◽  
...  
Keyword(s):  
World Economy ◽  
The State ◽  
Generation Z ◽  
Current Trends ◽  
Analytical Studies ◽  
International Consulting ◽  
The World ◽  
Private And Public ◽  
Effective Integration ◽  
Official Data

The article is dedicated to eSports as a new and promising sector of the world economy that provides businesses with effective integration scenarios. This contributes to the development of cooperation of private and public investors with eSports holdings, as well as to the involvement of the generation Z audience in promising consumption of interested companies’ products. The article examines the current trends in the development of the eSports market using analytical studies of international consulting companies. The official data characterizing the state of the eSports market in Russia are also represented. The article provides information about the model of monetization of eSports and its perspective directions. In conclusion, the article makes the necessary inferences to assess the prospects of such areas of the economy as eSports, both for the industry of interactive entertainment and for representatives of other market sectors.

Joint High Speed Sealift (JHSS) Segmented Model Test Data Analysis and Validation of Numerical Simulations

2012 ◽  
Author(s):  
Dominic Piro ◽  
Kyle A. Brucker ◽  
Thomas T. O'Shea ◽  
Donald Wyatt ◽  
Douglas Dommermuth ◽  
...  
Keyword(s):  
Data Analysis ◽  
Numerical Simulations ◽  
Test Data ◽  
Model Test ◽  
High Speed ◽  
Segmented Model

Guidelines for CFD Simulations of Spar VIM

2013 ◽  
Author(s):  
Charles Lefevre ◽  
Yiannis Constantinides ◽  
Jang Whan Kim ◽  
Mike Henneke ◽  
Robert Gordon ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Test Data ◽  
Model Test ◽  
Model Tests ◽  
Full Scale ◽  
Mooring System ◽  
Time Step ◽  
Cfd Simulations ◽  
Scaled Model ◽  
Sway Motion

Vortex-Induced Motion (VIM), which occurs as a consequence of exposure to strong current such as Loop Current eddies in the Gulf of Mexico, is one of the critical factors in the design of the mooring and riser systems for deepwater offshore structures such as Spars and multi-column Deep Draft Floaters (DDFs). The VIM response can have a significant impact on the fatigue life of mooring and riser components. In particular, Steel Catenary Risers (SCRs) suspended from the floater can be sensitive to VIM-induced fatigue at their mudline touchdown points. Industry currently relies on scaled model testing to determine VIM for design. However, scaled model tests are limited in their ability to represent VIM for the full scale structure since they are generally not able to represent the full scale Reynolds number and also cannot fully represent waves effects, nonlinear mooring system behavior or sheared and unsteady currents. The use of Computational Fluid Dynamics (CFD) to simulate VIM can more realistically represent the full scale Reynolds number, waves effects, mooring system, and ocean currents than scaled physical model tests. This paper describes a set of VIM CFD simulations for a Spar hard tank with appurtenances and their comparison against a high quality scaled model test. The test data showed considerable sensitivity to heading angle relative to the incident flow as well as to reduced velocity. The simulated VIM-induced sway motion was compared against the model test data for different reduced velocities (Vm) and Spar headings. Agreement between CFD and model test VIM-induced sway motion was within 9% over the full range of Vm and headings. Use of the Improved Delayed Detached Eddy Simulation (IDDES, Shur et al 2008) turbulence model gives the best agreement with the model test measurements. Guidelines are provided for meshing and time step/solver setting selection.

A Joint-Industry Effort to Develop and Verify CFD Modeling Practice for Vortex-Induced Motion of a Deep-Draft Semi-Submersible

2021 ◽  
Author(s):  
Hyunchul Jang ◽  
Dae-Hyun Kim ◽  
Madhusuden Agrawal ◽  
Sebastien Loubeyre ◽  
Dongwhan Lee ◽  
...  
Keyword(s):  
Test Data ◽  
Model Test ◽  
Working Group ◽  
Cfd Modeling ◽  
Physical Model Test ◽  
Mooring Lines ◽  
Cfd Models ◽  
Induced Motion ◽  
Modeling Practice ◽  
Decay Tests

Abstract Platform Vortex Induced Motion (VIM) is an important cause of fatigue damage on risers and mooring lines connected to deep-draft semi-submersible floating platforms. The VIM design criteria have been typically obtained from towing tank model testing. Recently, computational fluid dynamics (CFD) analysis has been used to assess the VIM response and to augment the understanding of physical model test results. A joint industry effort has been conducted for developing and verifying a CFD modeling practice for the semi-submersible VIM through a working group of the Reproducible Offshore CFD JIP. The objectives of the working group are to write a CFD modeling practice document based on existing practices validated for model test data, and to verify the written practice by blind calculations with five CFD practitioners acting as verifiers. This paper presents the working group’s verification process, consisting of two stages. In the initial verification stage, the verifiers independently performed free-decay tests for 3-DOF motions (surge, sway, yaw) to check if the mechanical system in the CFD model is the same as in the benchmark test. Additionally, VIM simulations were conducted at two current headings with a reduced velocity within the lock-in range, where large sway motion responses are expected,. In the final verification stage, the verifiers performed a complete set of test cases with small revisions of their CFD models based on the results from the initial verification. The VIM responses from these blind calculations are presented, showing close agreement with the model test data.

scholarly journals Experimental study of hydrodynamic forces acting on ship bow during wave capture

2019 ◽  
pp. 146-152
Author(s):  
Pavel Burakovskiy
Keyword(s):  
Experimental Study ◽  
Test Data ◽  
Model Test ◽  
Hydrodynamic Forces ◽  
Hydrodynamic Loads ◽  
Test Tank ◽  
Head Waves ◽  
Negative Effect

This paper studies behavior of ship in head waves, when her bow dips under water, which leads to hydrodynamic forces and moments to be assessed. This paper presents model test data obtained in the test tank on the model of ship bow (hydrodynamic loads on forecastle deck during wave capture) as well as updates the coefficient of flow around the bow. The study also shows that bulwark has negative effect upon safety in these conditions because it significantly increases hydrodynamic loads on the deck.

scholarly journals University Integration Management Algorithm in the National Innovation System

2018 ◽  
pp. 310-315
Keyword(s):  
Innovation System ◽  
National Innovation System ◽  
The State ◽  
Innovation Activity ◽  
Managerial Decision ◽  
Management Algorithm ◽  
Current Trends ◽  
Level Increase ◽  
Integration Management ◽  
Innovation Processes

The current trends of development, ensuring the welfare of the state, are in continuous communication with innovation activity. Under the influence of complex and sustainable innovation processes, the concept of the national innovation system is embodied at the macroeconomic level in its totality. Numerous elements are seen in the conjugation of the national innovation system scale, among which higher education institutions, and their scientific and innovative potential take their place. However, the reverse side is inequality in the levels of university integration, which introduces a discrepancy between the degree of their effectiveness as the elements of the national innovation system. So it becomes urgent to have a specific set of steps to improve the level of university integration. The process of integration level increase must be governed necessarily by the principles of suitable integration condition management, where it is possible to justify waiting by creation of a management algorithm for university integration in the national innovation system. The result of such an algorithm application is the obtaining of a visual set of steps by a user to ensure the process of managerial decision making and implementation to improve the level of university integration in the national innovation system. The increase of university integration will directly enhance its interaction with other elements of NIS, and therefore will increase its contribution to the national economy development, and other priority areas of the state.

Analysis of Turam model test data

1971 ◽  
Vol 9 (2-3) ◽  
pp. 160
Author(s):  
J.P. Williams
Keyword(s):  
Test Data ◽  
Model Test
Sign in / Sign up

Export Citation Format

Share Document