Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new user3D Numerical Modeling To Analyze Ship Squat Phenomenon in Canals
نمذجة رقمية ثلاثية البعد لتحليل ظاهرة الغاطس الديناميكي للسفن المبحرة عبر الأقنية
858
0 44
0
(
0
)
Created by
Shamra Editor
Ask ChatGPT about the research
تعتبر دراسة ظاهرة الغاطس الديناميكي في السفن من الموضوعات المهمة في علم هيدروديناميك السفن نظراً لارتباطها بأمن الملاحة البحرية و النهرية خاصةً في الوقت الحالي بعد الازدياد السريع في حجم السفن و سرعات تشغيلها. و يستخدم لتحقيق ذلك العديد من الطرائق التي تتفاوت في دقتها و سهولة امكانياتها. يهدف هذا البحث إلى إعداد نموذج رقمي ثلاثي البعد و ذلك لتحليل ظاهرة الغاطس الديناميكي للسفينة في الأقنية من خلال التقنيات الرقمية، باستخدام البيئات البرمجية المتقدمة لاستخراج حقول السرعة و حقول الضغط للجريان الحاصل حول بدن السفينة و التي تؤثر بشكل مباشر على هذه الظاهرة. لإعداد النموذج ثلاثي البعد و تمثيل الظاهرة و دراسة الجريان اللزج، تمت المحاكاة بالاستعانة ببرامج رقمية متقدمة مثل Gambit وAnsys Fluent. تم حساب الغاطس الديناميكي للسفينة و دراسة تأثير السرعة للسفينة و معامل انسداد القناة على هذه الظاهرة. تم التأكد من فاعلية البرامج الرقمية في تمثيل هذه الظاهرة، و مقارنة نتائجنا مع طرق أخرى حسابية و تجريبية لحساب الغاطس الديناميكي للسفينة في الأقنية.
The study of the phenomenon of ship squat in vessels can be considered as one of the most important topics in ships hydrodynamic science, because it is related to the marine secure, especially now after the rapid increase in size of vessels and operation speeds. In literatures there are methods that are used to predict ship squat. This research aims to develop a 3D Numerical Modeling to analyze the phenomenon of ship squat of the ship in Canals using computational numerical method and proper software, to extract the velocity and pressure fields of the flow around ship hull. The last one affect directly this phenomenon. To build a 3D model and to represent ship squat for viscous flow, simulation has been developed using Gambit and Ansys Fluent programs. ship squat has been integrating the motion of water level drop. The effect of vessel speed and blockage factor Cb have been taken into account. Results confirm the efficiency of the CFD for simulating ship squat. The comparison with other experimental and computational methods show good accuracy.
References used
MICHAEL J .BRIGGS , ‘Ship Squat Predictions for Ship /Tow Simulator ’, US Army Corps of Engineers, US, August 2006, P. 1-4
DEBAILLON P., EMMANUEL LEFRANCOIS, PHILIPPE SERGENT ,GOURI DHATT, ‘Numerical Modelling of Ship Squat in Shallow Restricted Water ’, France, 2004, P. 1-10
DEBAILLON P., ‘ Système de Modélisation de l’enfoncement dynamique des bateaux’, Thesis of the Université de Technologie de Compiègne, 2005, P. 1-5
rate research
Read More
As oil spells, it is important to act as quickly as possible in order to minimize
damages that can affect people and natural life. Thus, for the necessary operations to be
done on time following an accident, numerical simulation of oil spell is an
essential tool.
The purpose of this paper is to develop a 2-D numerical model for the main operations
that control and affect the trajectory and fate of an oil spill. Two additional operations had
been considered, those are evaporation and dissolution which lead to lose some of the
spilled oil even in air or water column. Afterwards, oil spill scenarios had been created and
spreading of an oil spill, whose density and initial position are known, had been examined.
Using MATLAB, flow simulations had been made and results had been discussed.
The oil reservoirs exploitation processes are one of very important
steps of petroleum industry. The rentability of investor reservoir is
related to correct planning and accurate understanding of rock
properties and liquids flow in porous media. T
he complexity of
porous media contains hydrocarbon materials, with phases changes related to thermo-physiochemical phenomena, make the classical methods used to study the reservoir recovery are inaccurate and insufficient to predict the performance and behavior of reservoir.
Recently, simulation and modeling are used to decrease the risks in the decision of the optimal recovery method, and achieve the best possible rentability. This method provides predictive capacity help us to better understanding of reservoir. By the suitable input data, we can solve the calibrated mathematical model analytically or numerically. We present in this research the formulation of
mathematical model of isotropic-one dimension reservoir with
single phase fluid flow. The numerical solution, the application of
this model, and the mechanism of pressure diffusivity along
productive formation, will be presented to simulate a reservoir with injection and production wells.
Studying of the dynamic behavior of the rolling ship on sea waves is one of topics of
special interest due to its close association with the ship stability and its direct impact on
the efficiency of the work of some of the systems and processes ins
ide the hull. This paper
includes an explanation of the proposed mathematical model to study the dynamic
behavior of the rolling ship on irregular waves in order to calculate the curves as a
function of ship breadth at different values of ship speed, bearing angle and metacenter
high, and thus determine the ship speed and bearing angle that causing resonance at
defined value of metacenter high. In addition to determine the critical breadth coincide
with the design speed of the ship. A computer program was prepared to perform
calculations according to the proposed model, which allowed studying the effect of some
parameters of the investment of the vessel (ship speed, and the angle of its route for the
main direction of spread of the waves) on ship rolling. It had been reached through this
research to extract mathematical equations which allow a precise and clear explanation of
the dynamic behavior of the ship rolling on waves.
Supporting tunnel face by Fiber glass pipes technology is an effective method to
maintain the stability of tunnel face, thus reducing surface settlements, face deformation
and maintaining the safety of the workers and the mechanisms used in tunneli
ng.
This paper presents the results of finite-difference numerical analyses (FLAC3D program)
on the behavior of a shallow tunnel face reinforced by longitudinal fiber glass pipes. A 3D
numerical model has been calibrated and used to demonstrate the effectiveness of this
technique, and perform a parametric study to determine the critical reinforcements
parameters (the density (number of pipes)(A) and length (L)). The results indicate that the
face reinforcement technique using longitudinal fiber glass pipes can significantly reduce
the movements (face displacement and surface settlements), and thus improving the face
stability. These movements decrease by increasing the length of the pipes and increasing
the density of the pipes until reaching the critical density, and when we reach the critical
length, the pipes must be renewed to maintain the stability of the tunneling process.
3D models of historical sites and monuments are very interesting in archaeology and digital tourism fields. These models help archeologists document historical sites and analyze the relationships between their components. Moreover, 3D models constitu
te an attractive factor that encourages visiting sites and presents virtual information about cultural heritage.
In this paper, we propose an approach that uses capabilities of CAD (Computer Aided Design) and GIS (Geographic Information System) systems to construct spatial and semantic database for historical sites and modeling them in 3D. Users of the mentioned database can use it to gather information about sites and to navigate across them via the animation capabilities in GIS.
The proposed ideas will be applied on the historical site of Ras-SHAMRA in Lattakia. Spatial data concerning the site will be acquired form a topographic plan designed in 2004. These data will then be processed and introduced into GIS environment. ArcGIS software will be used to achieve an Archeological Information System (AIS) for the site and to construct a 3D model of the site and the royal palace.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
