Thermo-mechanical coupling analysis of the orthotropic structures by using element-free Galerkin method

Zhang, Jianping; Wang, Shusen; Gong, Shengrong; Zuo, Qingsong; Hu, Huiyao

doi:10.1016/j.enganabound.2019.01.011

Cited by 32 publications

(6 citation statements)

References 30 publications

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“…As for the study of mechanical deformation of seal ring, Gemma ring theory, pitzino ring theory, gram body torque theory, finite element method, finite difference method, and finite volume method are used as usual. Zhang et al [11] simplified the seal ring into a cylinder according to Gemma ring theory and obtained the deformation and rotation angle of the seal ring. In addition, the author used the finite element method to calculate the thermal deformation of the mechanical seal and found that the temperature difference of the seal face will deform the flat seal face.…”

Section: Related Workmentioning

confidence: 99%

Friction Performance Analysis of Reactor Coolant Pump Shaft Seal Based on Sensor and Computer Simulation

2022

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In recent years, the state has put forward a grand plan to develop nuclear power in order to control environmental pollution and carbon emissions. In nuclear power plants, mechanical seals for reactor coolant pump play an important role in nuclear power safety production. However, China cannot independently produce such mechanical seals, and they are blocked by foreign related technologies, which has seriously affected China’s nuclear power development plan and the overall safety of China’s nuclear power operation. Under this background, this paper studies the friction performance of the shaft seal of the reactor coolant pump, uses the sensor to obtain the data of friction factors such as low-pressure leakage, effectively monitors the low-pressure leakage through calculation and simulation modeling, truly reflects the operating state of the reactor coolant pump, and provides a new research direction and experimental basis for further analysis of the friction performance of the shaft seal of the reactor coolant pump. The results show that under the joint action of the pressure difference and the force generated by the deformation of the moving ring plate, the cone angle formed on the seal end face is 1300.9 μ convergence gap of rad. When the inlet water temperature is 65°C, the leakage rate is 1867.8 L/h. The deformation of the moving ring deformation ring plate can hinder the increase of the deformation cone angle of the moving ring. The greater the thickness of the moving ring deformation ring plate, the greater the seal leakage rate. The inlet temperature of the sealing medium and the friction performance of the material also have an impact on the sealing performance.

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Section: Related Workmentioning

confidence: 99%

Friction Performance Analysis of Reactor Coolant Pump Shaft Seal Based on Sensor and Computer Simulation

2022

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“…In Equation ( 9), the first term on the right side indicates the monopole source caused by a surface acceleration or displacement; the second term determines the dipole source caused by surface pressure disturbances; the third term represents the quadruple sound source induced by turbulent flows. It is worth mentioning that rather than the built-in methods in Ansys Fluent, there are more advanced numerical methods to solve the viscous resistance and inertial resistance coefficients, such as the element-free Galerkin method [30] and the generalized 2D Bézier method [31].…”

Section: Aeroacoustics Governing Equations: Fw-h Acoustic Analogymentioning

confidence: 99%

Numerical Study on Flow and Noise Characteristics of an NACA0018 Airfoil with a Porous Trailing Edge

et al. 2022

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An airfoil with a porous trailing edge has a low noise emission; thus, using a porous medium is a good technique for further reduction of wind turbine noise. In this paper, to reduce airfoil trailing edge noise while minimizing the negative influence of a porous medium on aerodynamic performance, a new filling method is proposed such that a porous medium is only used in the suction side half of the trailing edge, which is more sensitive to the noise generation. The large eddy simulation (LES) technique for flow and the Ffowcs Williams and Hawkings (FW-H) method for acoustics are used. At a Reynolds number of 2.63 × 105 and various angles of attack, an NACA0018 airfoil profile with a porous trailing edge covering 20% of the chord is studied under two porous configurations, namely a fully porous and a suction-side porous trailing edge type. The results show that the flow direction, velocity magnitude, and their distributions along the boundary layer of the two porous airfoils are significantly modified due to the presence of the porous medium. The fluctuation of the pressure coefficient and the increase in the boundary layer thickness are significant at low angles of attack. As compared to the solid airfoil counterpart, the noise radiation from the newly proposed suction-side porous airfoil achieves a noise reduction of 4.3 dB at an angle of attack α = 0°, and a noise reduction of 4.07 dB at an angle of attack α = 2°.

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“…Mesh-free methods rely only on nodal points for constructing approximations, which effectively eliminates the drawbacks inherent in mesh-based methods. Out of these Element free Galerkin method (EFGM) (Belytschko et al, 1994) has contributed most to the simulation of fracture problems (Zhang et al, 2019;Kumar & Ghosh, 2021). EFGM stands out among other mesh-free techniques employed in fracture problems due to its ability to eliminate the need for re-meshing and redistribution of nodal data.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Thermoelastic Crack Interactions in Various Materials using a Novel Enrichment Approach

Awasthi,

Pant

2023

Int. j. math. eng. manag. sci.

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Crack interaction studies play a crucial role in understanding and predicting the fracture behaviour of various engineering components subjected to thermomechanical loads. The present work investigates the interaction effect of multiple cracks in different types of material subjected to thermoelastic loadings using Element free Galerkin method (EFGM). These materials include isotropic material, orthotropic material, functionally graded material, and layered material. These all materials are subjected to thermoelastic loads in presence of multiple cracks to investigate the effect of crack interactions. A novel modified Intrinsic enrichment has been proposed to precisely capture the interaction effect and stress fields in the presence of multiple cracks. The proposed algorithm has been tested for a benchmark problem and it produced better stress fields in comparison to the conventional EFGM procedure. Stress intensity factors corresponding to variations in crack parameters have been evaluated concerning with the primary crack. Results reveal that presence of multiple cracks alters the crack tip stress fields owing to the interaction effect i.e shielding or amplification. Additionally, parameters such as crack length, crack orientation, distance between cracks, and domain properties greatly influence the stress intensity factor of the primary crack. These parameters exhibit varying behaviour under distinct circumstances, and their effects have been thoroughly analysed. Current work provides valuable insights into the effects of crack interactions in different media under thermoelastic loadings, thereby ensuring the structural integrity and durability of these materials for practical applications.

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Thermo-mechanical coupling analysis of the orthotropic structures by using element-free Galerkin method

Cited by 32 publications

References 30 publications

Friction Performance Analysis of Reactor Coolant Pump Shaft Seal Based on Sensor and Computer Simulation

Friction Performance Analysis of Reactor Coolant Pump Shaft Seal Based on Sensor and Computer Simulation

Numerical Study on Flow and Noise Characteristics of an NACA0018 Airfoil with a Porous Trailing Edge

Numerical Investigation of Thermoelastic Crack Interactions in Various Materials using a Novel Enrichment Approach

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