Free surface flow simulation around an appended ship hull

Abstract

This study brings forward the results of previously published work of free surface flow simulation around a fast ship model.Experimental measurements and numerical simulations of a fast bare-hull ship model form are now extended to the same ship form with appendices for a wide range of Froude numbers.The governing equations are discretized by means of an unstructured finite volume mesh.The standard k-ε turbulence model and Volume of Fluid Method to capture the two phase media are used.The total resistance, due to wave and wake fields of the ship model with appendages and the resistance of the appendages alone are calculated numerically, and compared with the experiments.The experiments and computations were performed for 11 different Froude numbers between 0.103 and 0.322.For Froude numbers up to 0.25, numerical simulations found to be quite in agreement with the experiments.It has been found that appendages increase the total drag mainly by increasing the pressure resistance, and the effect of the appendages becomes more important as the flow speed gets higher.This study brings forward the results of previously published work of free surface flow simulation around a fast ship model.Experimental measurements and numerical simulations of a fast bare-hull ship model form are now extended to the same ship form with appendices for a wide range of Froude numbers.The governing equations are discretized by means of an unstructured finite volume mesh.The standard k-ε turbulence model and Volume of Fluid Method to capture the two phase media are used.The total resistance, due to wave and wake fields of the ship model with appendages and the resistance of the appendages alone are calculated numerically, and compared with the experiments.The experiments and computations were performed for 11 different Froude numbers between 0.103 and 0.322.For Froude numbers up to 0.25, numerical simulations found to be quite in agreement with the experiments.It has been found that appendages increase the total drag mainly by increasing the pressure resistance, and the effect of the appendages becomes more important as the flow speed gets higher.This study brings forward the results of previously published work of free surface flow simulation around a fast ship model.Experimental measurements and numerical simulations of a fast bare hull ship model form are now extended to the same ship form with appendices for a wide range of Froude numbers.The governing equations are discretized by means of an unstructured finite volume mesh.The standard k-ε turbulence model and Volume of Fluid Method to capture the two phase media are used.The total resistance, due to wave and wake fields of the ship model with appendages and the resistance of the appendages alone are calculated numerically, and compared with the experiments.The experiments and computations were performed for 11 different Froude numbers between 0.103 and 0.322.For Froude numbers update to 0.25, found to being in the quote agmentment of the appendments of the appendments with the appendments of the main appendments.تقدم هذه الدراسة نتائج العمل المنشور سابقًا لمحاكاة التدفق السطحي الحر حول نموذج سفينة سريع. يتم الآن تمديد القياسات التجريبية والمحاكاة العددية لنموذج سفينة عارية الهيكل السريع إلى نفس شكل السفينة مع ملاحق لمجموعة واسعة من أرقام فرود. يتم تقسيم المعادلات الحاكمة عن طريق شبكة حجم محدودة غير منظمة. يتم استخدام نموذج الاضطراب k - ε القياسي وحجم طريقة الموائع لالتقاط وسائط المرحلتين. يتم حساب المقاومة الكلية، بسبب حقول الموجة والاستيقاظ لنموذج السفينة مع الزوائد ومقاومة الزوائد وحدها عدديًا، ومقارنة بالتجارب. تم إجراء التجارب والحسابات لـ 11 رقمًا مختلفًا من أرقام فرود بين 0.103 و 0.322. بالنسبة لأرقام فرود القياسية التي تصل إلى 0.25، وجد أن المحاكاة العددية تتفق تمامًا مع التجارب. لقد وجد أن الزوائد تزيد من إجمالي السحب بشكل أساسي عن طريق زيادة المقاومة والضغط وتأثير الزوائد الأكثر أهمية مع زيادة سرعة التدفق.This study brings forward the results of previously published work of free surface flow simulation around a fast ship model.Experimental measurements and numerical simulations of a fast bare-hull ship model form are now extended to the same ship form with appendices for a wide range of the appendages alone are calculated numerically, and compared with the experiments.The experiments and computations were performed for 11 different Froude resistance between 0.103 and 0.322. Fude uprobers 0.2, simulation of the appendages alone are calculated asperically, and compared with the experiments.The experiments and computations were performed for the different Froude resistance for the 11 different Froude resistance between 0.103 and 0.322.