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3D Numerical Modeling To Analyze Ship Squat Phenomenon in Canals

نمذجة رقمية ثلاثية البعد لتحليل ظاهرة الغاطس الديناميكي للسفن المبحرة عبر الأقنية

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 Publication date 2016
and research's language is العربية
 Created by Shamra Editor




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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.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة ظاهرة الغاطس الديناميكي للسفن المبحرة عبر الأقنية، وهي ظاهرة هامة في علم هيدروديناميك السفن نظراً لتأثيرها الكبير على أمن الملاحة البحرية والنهرية. يهدف البحث إلى إعداد نموذج رقمي ثلاثي الأبعاد لتحليل هذه الظاهرة باستخدام برامج متقدمة مثل Ansys Fluent. تم حساب الغاطس الديناميكي للسفينة ودراسة تأثير سرعة السفينة ومعامل انسداد القناة على هذه الظاهرة. أظهرت النتائج فعالية البرامج الرقمية في تمثيل الظاهرة بدقة، وتمت مقارنتها مع طرق حسابية وتجريبية أخرى. كما تم استنتاج أن الغاطس الديناميكي يزداد مع زيادة سرعة السفينة وينخفض مع زيادة عرض القناة. توصي الدراسة بأخذ عوامل أخرى مؤثرة على الظاهرة مثل تغير شكل القاع في الاعتبار في الدراسات المستقبلية.
Critical review
تعد هذه الدراسة خطوة هامة في فهم وتحليل ظاهرة الغاطس الديناميكي للسفن، إلا أنها تفتقر إلى بعض الجوانب التي يمكن أن تعزز من دقتها وشموليتها. على سبيل المثال، لم يتم تناول تأثير الأمواج الطويلة وتغيرات شكل القاع بشكل كافٍ، وهو ما يمكن أن يؤثر بشكل كبير على النتائج. كما أن الدراسة اعتمدت على نموذج رقمي ثابت ولم تأخذ في الاعتبار التغيرات الزمنية في الجريان، مما قد يقلل من دقة التوقعات في الحالات الواقعية. بالإضافة إلى ذلك، يمكن تحسين الدراسة من خلال استخدام نماذج أكثر تعقيدًا تشمل تأثيرات أخرى مثل تأثير الرفاص والأمواج. على الرغم من هذه النقاط، فإن الدراسة تقدم إسهامًا قيمًا في مجال هيدروديناميك السفن وتفتح الباب لمزيد من الأبحاث المستقبلية.
Questions related to the research
  1. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي هو إعداد نموذج رقمي ثلاثي الأبعاد لتحليل ظاهرة الغاطس الديناميكي للسفن في الأقنية باستخدام برامج متقدمة مثل Ansys Fluent.

  2. ما هي العوامل الرئيسية التي تؤثر على الغاطس الديناميكي للسفن؟

    العوامل الرئيسية تشمل سرعة السفينة، عرض القناة، ومعامل انسداد القناة.

  3. ما هي البرامج المستخدمة في إعداد النموذج الرقمي؟

    تم استخدام برامج Gambit وAnsys Fluent في إعداد النموذج الرقمي.

  4. ما هي التوصيات التي قدمتها الدراسة للمستقبل؟

    توصي الدراسة بأخذ عوامل أخرى مؤثرة على الظاهرة مثل تغير شكل القاع في الاعتبار في الدراسات المستقبلية.


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
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