Numerical Simulation on Flow Field and Design Optimization of a Generator Unit Based on Computational Fluid Dynamics Analysis

Xu, Yingying; Tan, Libin; Yuan, Yuejin; Zhang, Man

doi:10.1155/2021/3350867

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Turbulence models consider the statistical features of turbulence to estimate the impact of turbulent motion. The k-ε model, commonly used in CFD simulations of turbulent fluid dynamics and widely applied in near-wall turbulence modeling in engineering fields, describes the velocity and turbulent energy distribution of the turbulent flow [24]. Wilcox's modified formulation of the k-ω turbulence model [25] includes a single new closure approach and an adjustment describing the dependence of the eddy viscosity on turbulence properties.…”

Section: Selection Of the Turbulence Modelmentioning

confidence: 99%

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Wang,

Gu,

Lang

et al. 2024

JMSE

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This study verifies the effects of deployment parameters on the safe separation of Autonomous Underwater Vehicles (AUVs) and mission payloads. The initial separation phase is meticulously modeled based on computational fluid dynamics (CFD) simulations employing the cubic constitutive Shear Stress Transport (SST) k-ω turbulence model and overset grid technologies. This phase is characterized by a 6-degree-of-freedom (6-DOF) framework incorporating Dynamic Fluid-Body Interaction (DFBI), supported by empirical validation. The SST k-ω turbulence model demonstrates superior performance in managing flows characterized by adverse pressure gradients and separation. DFBI entails computationally modeling fluid–solid interactions during motion or deformation. The utilization of overset grids presents several advantages, including enhanced computational efficiency by concentrating computational resources solely on regions of interest, simplified handling of intricate geometries and moving bodies, and adaptability in adjusting grids to accommodate changing simulation conditions. This research analyzes mission payloads’ trajectories and attitude adjustments after release from AUVs under various cruising speeds and initial release dynamics, such as descent and angular velocities. Additionally, this study evaluates the effects of varying ocean currents at different depths on separation safety. Results indicate that the interaction between AUVs and mission payloads during separation increases under higher navigational speeds, reducing the separation speed and degrading the stability. As the initial drop velocities increase, fast transition through the AUV’s immediate flow field promotes separation. The core of this process is the initial pitch angle management upon deployment. Optimizing initial pitching angular velocity prolongs the time for mission payloads to reach their maximum pitch angle, thus decreasing horizontal displacement and improving separation safety. Deploying AUVs at greater depths alleviates the influence of ocean currents, thereby reducing disturbances during payload separation.

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Section: Selection Of the Turbulence Modelmentioning

confidence: 99%

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Wang,

Gu,

Lang

et al. 2024

JMSE

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“…For values of empirical constants, the C1ε,C2ε are 1.44 and 1.92, respectively, σk,σε are 1.0 and 1.3, respectively, Cu is 0.09. 51…”

Section: Computational Fluid Dynamics Modelling Of Engine Water Jacketmentioning

confidence: 99%

CFD modelling on flow field characteristics of engine cooling water jacket and its cooling performance improvement based on coolant transport path analysis method

Tan

Yuan

Huang

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Reasonable coolant flow distribution and its heat transfer coefficient (HTC) distribution are of great significance to the cooling performance of water-cooled engine. Therefore, the present paper proposes a coolant transport path analysis method aiming at analyzing coolant velocity distribution and optimizing the coolant flow characteristics of water jacket based on Computational Fluid Dynamics (CFD), with particular emphasis on the assessment of coolant flow velocity distributions of high-temperature area of engine head water jacket. First, the coolant flow characteristics of a single-cylinder water jacket is investigated and it is found that coolant velocity of exhaust bridge is less than 1.5 m/s and the HTC distribution of water jacket under three flow conditions of 15 L/min, 25 L/min and 35 L/min have a small area reaching 5000 W/(m2∙K). Some areas have no coolant flow and the mass flowrate distribution of each gasket hole is unreasonable, proving that original water jacket structure has some shortcomings and need to be optimized. Based on coolant transport analysis, an improved design of the single cylinder water jacket is proposed and HTC distribution of improved water jacket meet cooling requirements that HTC in high heat load area are above 5000 W/(m2∙K). The coolant transport path analysis method for optimizing coolant flow characteristics of water jacket proves to be an effective way through successful application and remarkable achievement in the other single-cylinder water jacket and two-cylinder water jacket that coolant flow distribution become more reasonable and coolant velocity of high-temperature areas are bigger than 1.5 m/s.

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“…Zhang Yu, and Yin Jianping et al proposed a multi-mode combatant with a composite poly charge structure, changing the location of the initiation point and the shape of the blast wave acting on the drug-type hood, and using LS-DYNA software to study multi-mode destructive element formation yielded an increase in the length and length-to-diameter ratio of the destructive element formed by the multi-mode combatant with the increase in the thickness of the outer hood top [2] . Xu Guangze and Zhang Liang studied the optimization of dual-mode combatant structures using ANSYS software simulation, and the optimal structure parameters of JET and JPC detonation method and charge cover were obtained [3] . Wang Yang, Han Yinquan, et al focused on the optimized design of a dualmode combatant forming charge stern structure and analyzed the influence of the forming charge stern structure on the explosive-formed projectile (EFP) and the penetration body of the concentrator rod (JPC).…”

Section: Introductionmentioning

confidence: 99%

Simulation of the formation process and structural optimization of JPC destructive elements in dual-mode combat units

Guo

Jiao

Lan

et al. 2023

Second International Conference on Electronic Information Engineering, Big Data, and Computer Technology (EIBDCT 2023)

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To study the effect of multi-mode combat part destruction, in this paper, we use AUTODYN simulation software to simulate the effects of dual-mode combatants on the shaping of the destruction element under different structures of the charge cover, charge height, and detonation method, and determine the optimization scheme of dual-mode combatants through orthogonal optimization. This study has a certain reference value for the structural design of multi-mode warheads and the study of damage effects.

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Numerical Simulation on Flow Field and Design Optimization of a Generator Unit Based on Computational Fluid Dynamics Analysis

Cited by 6 publications

References 28 publications

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

CFD modelling on flow field characteristics of engine cooling water jacket and its cooling performance improvement based on coolant transport path analysis method

Simulation of the formation process and structural optimization of JPC destructive elements in dual-mode combat units

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