Numerical simulation of two-dimensional fluid flow problem using truly meshfree method

The jet pipe servo valve (jet valve) is the most widely used flow control servo valve on aircrafts and spacecrafts. However, the valve has not been simulated accurately due to its special structure and complex internal flow field. The structure design and performance analysis of the valve mainly rely on repeated experiments, which greatly limits the development efficiency of the valve. To solve the problem, this paper analyzes the magnetic field, flow field and structure field, all of which are involved in the working of the valve, one by one, and numerically simulate the coupling of the three fields. The simulated results were verified through experiments. Our method can greatly enhance the accuracy of jet valve simulation, providing a good reference to the simulation of various complex electrohydraulic devices.

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“…At this time, the opening size of the valve remains constant. In this way, the load flow can be controlled through current adjustment [20,21].…”

Section: System Structure and Working Principlementioning

confidence: 99%

Numerical Simulation of Jet Pipe Servo Valve

Zhang

Chen

2020

Teh. vjesn

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“…Multi-dimensional and complex problems have also been addressed by the MLPG method such as 3D thermo-elastoplastic analysis of thick functionally graded plate (Vaghefi et al, 2016), 2D fluid flow problems (Garg et al, 2018a), multi-dimensional nonlinear convection-diffusion equations based on least square radial basis function partition of unity method (Li et al, 2018), 2D complex Ginzburg-Landau equation (Shokri and Bahmani, 2019) and 2D and 3D steady-state heat conduction in regular and complex domains (Singh and Singh, 2019). Safarpoor and Shirzadi (2019) have applied the radial basis function-MLPG (RBF-MLPG) method for numerical study of heat and mass transfer equations in elliptic fins and observed that the method enjoys exponential convergence, stability and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of two-dimensional fins using the meshless local Petrov – Galerkin method

Garg¹,

Thakur²,

Tripathi³

2020

Self Cite

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Purpose The study aims to highlight the behaviour of one-dimensional and two-dimensional fin models under the natural room conditions, considering the different values of dimensionless Biot number (Bi). The effect of convection and radiation on the heat transfer process has also been demonstrated using the meshless local Petrov–Galerkin (MLPG) approach. Design/methodology/approach It is true that MLPG method is time-consuming and expensive in terms of man-hours, as it is in the developing stage, but with the advent of computationally fast new-generation computers, there is a big possibility of the development of MLPG software, which will not only reduce the computational time and cost but also enhance the accuracy and precision in the results. Bi values of 0.01 and 0.10 have been taken for the experimental investigation of one-dimensional and two-dimensional rectangular fin models. The numerical simulation results obtained by the analytical method, benchmark numerical method and the MLPG method for both the models have been compared with that of the experimental investigation results for validation and found to be in good agreement. Performance of the fin has also been demonstrated. Findings The experimental and numerical investigations have been conducted for one-dimensional and two-dimensional linear and nonlinear fin models of rectangular shape. MLPG is used as a potential numerical method. Effect of radiation is also, implemented successfully. Results are found to be in good agreement with analytical solution, when one-dimensional steady problem is solved; however, two-dimensional results obtained by the MLPG method are compared with that of the finite element method and found that the proposed method is as accurate as the established method. It is also found that for higher Bi, the one-dimensional model is not appropriate, as it does not demonstrate the appreciated error; hence, a two-dimensional model is required to predict the performance of a fin. Radiative fin illustrates more heat transfer than the pure convective fin. The performance parameters show that as the Bi increases, the performance of fin decreases because of high thermal resistance. Research limitations/implications Though, best of the efforts have been put to showcase the behaviour of one-dimensional and two-dimensional fins under nonlinear conditions, at different Bi values, yet lot more is to be demonstrated. Nonlinearity, in the present paper, is exhibited by using the thermal and material properties as the function of temperature, but can be further demonstrated with their dependency on the area. Additionally, this paper can be made more elaborative by extending the research for transient problems, with different fin profiles. Natural convection model is adopted in the present study but it can also be studied by using forced convection model. Practical implications Fins are the most commonly used medium to enhance heat transfer from a hot primary surface. Heat transfer in its natural condition is nonlinear and hence been demonstrated. The outcome is practically viable, as it is applicable at large to the broad areas like automobile, aerospace and electronic and electrical devices. Originality/value As per the literature survey, lot of work has been done on fins using different numerical methods; but to the best of authors’ knowledge, this study is first in the area of nonlinear heat transfer of fins using dimensionless Bi by the truly meshfree MLPG method.

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“…Computer numerical simulation is a low-cost technology capable of simulating various complex combustion conditions of hydrocarbon fuel. As a result, this technology has become a popular way to explore the combustion mechanism of hydrocarbon fuel [5][6][7][8][9]. Computer simulation has been frequently employed to construct the kinetics model of hydrocarbon fuel in chemical reactions, aiming to identify the chemical reaction rate of the fuel during combustion and the formation path of combustion products [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Kinetics Analysis on Chemical Reactions of Hydrocarbon Fuel Based on Computer Simulation

Liu¹,

Liu²,

Nan³

2019

IJHT

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Hydrocarbon fuel is one of the most heavily used fuels. To optimize the engine performance and realize efficient use of hydrocarbon fuel, it is very meaningful to probe into the combustion mechanism of hydrocarbon fuel in the engine and examine the kinetics principles of the fuel in chemical reactions. In this paper, the chemical kinetics of hydrocarbon fuel was explored with the software CHEMKIN. The author constructed a kinetics model for methane in chemical reactions, and analyzed the main paths of chemical reactions in methane combustion. In addition, the elementary reactions in methane combustion were screened through sensitivity analysis, which focuses on the impacts of the methane concentration, air ratio and combustion products on the sensitivity features of the chemical reaction kinetics model. In this way, the main elementary reactions of methane combustion and the main components of the chemical reaction kinetics model were identified. The comparison between simulated and measured values show that the two values shared a similar trend, indicating that our simplified chemical reaction kinetics model can fulfill the requirements for practical application. The proposed method can be adopted for the numerical simulation of hydrocarbon fuel combustion in the engine.

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Numerical simulation of two-dimensional fluid flow problem using truly meshfree method

Cited by 3 publications

References 24 publications

Numerical Simulation of Jet Pipe Servo Valve

Numerical Simulation of Jet Pipe Servo Valve

Numerical simulation of two-dimensional fins using the meshless local Petrov – Galerkin method

Kinetics Analysis on Chemical Reactions of Hydrocarbon Fuel Based on Computer Simulation

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