Numerical investigations of the flow induced oscillation of a torque converter

Se propone un procedimiento para estudiar el fenómeno de vibración inducida por flujo (FIV) en tuberías que transportan fluido newtoniano en régimen turbulento. Se usa un modelo numérico que considera la interacción fluido-estructura a través del acoplamiento bidireccional entre estos dominios físicos. Se emplean los métodos de Volúmenes Finitos y Elementos Finitos para resolver los dominios fluidodinámico y estructural, respectivamente. Se considera: (i) condición de periodicidad para obtener rápidamente un flujo turbulento totalmente desarrollado, (ii) modelo WMLES S-Omega para la turbulencia, (iii) tubería de material elástico lineal, y (iv) teoría de grandes desplazamientos. El modelo se implementa en el software ANSYS 2019 R1. Se simulan tres condiciones de flujo de agua en una tubería horizontal biempotrada de PVC de 20.4 mm de diámetro interno. Los resultados muestran los mismos efectos de la velocidad sobre la amplitud y frecuencia de vibración que los reportados en estudios experimentales y analíticos, validando el procedimiento propuesto.

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“…En el presente estudio se establece ϕ ≤ 0.01. El mismo criterio de convergencia ha sido utilizado por Liu et al (2018) y Pei et al (2012).…”

Section: Modelado Numéricounclassified

Procedimiento para el análisis de vibración inducida por flujo turbulento en tuberías usando simulación numérica

et al. 2020

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“…In order to satisfy the above conditions, a separate coupling method was used. 22 In each time step, the flow field was calculated first and the coupling force was calculated at interaction surface. Then the coupling force was taken as the mechanical boundary conditions to participate in the structural field calculation.…”

Section: Mathematical Modelmentioning

confidence: 99%

Investigation of single droplet impact on canopy fabric

Cheng

Sun

Tan

et al. 2019

Journal of Engineered Fibers and Fabrics

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As raindrops impact on the canopy, the impact force and canopy vibration will be produced. And the impacting will seriously affect the deceleration characteristics of the parachute system. However, it is very difficult to obtain the impact force and vibration characteristics by the existing experimental methods. In order to solve the above problem, a two-way fluid structure interaction numerical method was used to investigate the process of single droplet impacting on canopy fabric. The Volume of Fluid (VOF) model was used in fluid calculation and the fabric was described by a thin porous domain. The finite element method was used to calculate the fabric dynamic response. The exchange of coupling information was achieved by a weak method. Based on the above method, a typical raindrop (2.12 mm) impacting on 66 type polyamide grid silk was studied in this article. The numerical results agreed well with the experimental results, which verified the feasibility and accuracy of the method used in this article. More importantly, the impact force and vibration characteristics were obtained. Finally, the effects of impact velocity, water permeability, and fabric pretension on impacting process were analyzed. The method and conclusions could provide a reference for aeronautical lifesaving, printing, and dyeing.

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“…The RNG K-e transport model was selected as the turbulence model. 22,23 The initial turbulence intensity was set to 3%, and the simulation started from zero fluid velocity. Residual values of 10 -5 for the flow continuity, velocity, and turbulent kinetic energy were adopted as the CFD solution convergence criteria.…”

Section: Computational Modelmentioning

confidence: 99%

Effect of internal leakage on torque converter characteristics

Pan

Chen

Sun³

et al. 2014

Advances in Mechanical Engineering

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To understand the effect of internal leakage on the torque field and characteristics of a torque converter (TC), a transient analysis was performed on the internal flow of a TC and the pressure pulsation characteristics of monitoring points in the convection channel. It was found that dividing the leakage area of the TC into a separate watershed improved simulation accuracy by 4%. When there was a leakage area, there were distinct collision, mixing, and assimilation stages between the leakage flow and the main flow. These phenomena caused energy loss that was highest at low speed ratios. However, the leakage flow always accounted for 12% of the main flow regardless of the speed ratio. At the same time, the leakage flow had a larger influence on pressure pulsation inside the TC and especially the low frequency band was more substantial. This shows that the leakage area has a large influence on the TC performance, energy loss, and flow state. Analysis of the leakage area showed that reducing the leakage area helps to improve powertrain performance and fuel economy.

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Numerical investigations of the flow induced oscillation of a torque converter

Cited by 12 publications

References 28 publications

Procedimiento para el análisis de vibración inducida por flujo turbulento en tuberías usando simulación numérica

Procedimiento para el análisis de vibración inducida por flujo turbulento en tuberías usando simulación numérica

Investigation of single droplet impact on canopy fabric

Effect of internal leakage on torque converter characteristics

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