CFD Analysis into the Resistance Estimation of Hard-Chine Monohull using Conventional against Inverted Bows

The hull model of the surface combatant DTMB 5415 has been selected as a recommended benchmark naval ship for computational fluid dynamics (CFD) validation for resistance analysis. CFD is used to present a method for predicting surface combatant ship resistance. The resistance calculations of a 3 m DTMB 5415 hull model was compared using experimental and CFD techniques. The bare hull shape experiments were set up and carried out at the towing tank facilities at the Military Technical College's Hydrodynamic Laboratory in Egypt. A benchmark test will ensure that the equipment, procedures, and estimates of uncertainty are adequate. For the purpose of model validation, CFD calculations for a DTMB 5415-51 model are performed using three different mesh sizes for Froude numbers ranging from 0.10 to 0.40. For the same Froude numbers and free model conditions, results from towing tank experiments on the model's resistance, sinkage, and trim are presented. The numerical simulations are quantitatively consistent. The numerical results are compared in terms of wave field and resistance coefficients to determine the accuracy of the solution parameters. As evidenced by the resistance curves, the experimental investigation appears to provide very good agreement, indicating that the CFD model is capable of simulating the steady flow around a ship hull with acceptable accuracy and can thus be used as a supplement to laboratory model tests for ship design and ship hydrodynamic research.

Section: Computational Domain Boundaries and Mesh Configurationmentioning

confidence: 99%

Experimental and CFD Resistance Validation of Naval Combatant DTMB 5415-51 Model

Alaaeldeen Mohamed Elhadad,

Ahmed Mokhtar Abo El-Ela

2023

“…Both zones' widths are assumed to be equal to one hull length. To create a structured multi-block grid, the domain volume is divided into several sub volumes [11,12]. The grids at the free surface and near the model are refined in order to get better resolution of free-surface elevation in the area of importance and improve the boundary layer approximation [13].…”

Section: Grid Generation Solution Domain and Boundary Conditionsmentioning

confidence: 99%

Comparative Investigation of Resistance Prediction for Surface Combatant Ship Model using CFD Modeling

Alaaeldeen Mohamed Elhadad Ahmed

2023

The Multi-Mission Surface Combatant (MMSC) is a highly maneuverable combatant ship capable of littoral and open ocean operations. It was designed to confront modern maritime and economic security threats. The MMSC takes the proven capabilities of the littoral combat ship and the inherent flexibility of the Freedom-variant hull to meet the unique maritime requirements of international navies. Computational fluid dynamics (CFD) is applied to present a method to predict the resistance for new surface combatant ship. First, calculations for a typical benchmark DTMB 5415-24 model are carried out using three different mesh sizes for Froude numbers from 0.10 to 0.48 for the purpose of model validation by Star CCM+. The numerical results are compared with the experimental data and the published CFD solutions in terms of wave field and resistance coefficients for accuracy of the solution parameters. Finally, the method is used to study the influence of Froude number variation on the total resistance and wave pattern for the new combatant ship model under the same conditions. Quantitative agreement between the numerical simulations has been observed. This demonstrates that our CFD model is capable of simulating the steady flow around a ship hull with an acceptable accuracy and thus can be used as a complementary tool to laboratory model tests for ship design and ship hydrodynamic research.

“…A more favorable alternative, the CFD method can provide relatively accurate results and furnish more intricate details of the flow around the ship hull with a shorter time and at a lower cost compared to the experimental method [1]. Consequently, the CFD method has been universally adopted for investigating the ship resistance and flow around the hull [2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Flow Around the Containership by using CFD Method

Nguyen Thi Ngoc Hoa,

Tat-Hien Le,

Le Doan Nhat Huy

2024

Predict accurately resistance of the ship and flow around ship hull form is extremely important as these are input parameters for optimizing ship hull form, designing the ship propulsion system. This paper focuses on the numerical simulation of the flow around the Container Ship Fortune Freighter in calm water condition at different ship speeds by using CFD method. The results of impact of ship speed on components of ship resistance, wave patterns, volume fraction of air, the distribution of pressure, and wall shear stress on the ship's hull surface, as well as the nominal wake field are provided and analysed in this paper.