A one-way coupled numerical magnetic field and CFD simulation of viscoplastic compressible fluids in MR dampers

Elsaady, Wael Abdelmoneam; Oyadiji, S. Olutunde; Nasser, Adel

doi:10.1016/j.ijmecsci.2019.105265

Cited by 43 publications

(66 citation statements)

References 42 publications

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“…9. Being different from [32], the main region affected by magnetic field is not entirely in the annular gap, and there is overflow at both ends of gap. The calculation result of MR damper may be affected, therefore, it is necessary to write the "arc" region at both ends of annular gap in UDF code, which, combined with the magnetic flux density distribution curve shown in Fig.…”

Section: A Results Of Magnetic Field Fe Analysismentioning

confidence: 91%

“…According to the theoretical viscoplastic equation shown in [32], [33], the dynamic viscosity of Bingham fluid is defined by the hyperbolic tangent function, as shown in (4).…”

Section: B Properties Of Fluid Materialsmentioning

confidence: 99%

“…Compared with the traditional onedimensional analytical model, numerical simulation is more accurate and available for better visualized parameters. For example, parameter contours, streamlines, non-Newtonian viscosity region, vortex distribution, etc., which are all of great significance to the research of MR damper [32]. However, there are still many difficulties ahead in CFD simulation at present: (a) The problem of passive motion with implicit boundary conditions.…”

mentioning

confidence: 99%

“…The non-Newtonian viscosity was written in a special language (CCL). Wael [32] coupled the magnetic field and fluid in COMSOL and ANSYS/Fluent, and also performed sinusoidal periodic motion analysis. Tong [35] established a fluid mesh model for colloidal dampers with holes and without gaps.…”

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confidence: 99%

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Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Liu

2020

IEEE Access

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It is necessary to install a damping energy absorbing structure for a certain type of naval gun test shell without projectile belt. Applicable high-performance dampers currently include viscoelastic colloidal damper and magnetorheological damper, and two kinds of special dampers for test shells have been designed and manufactured. In order to evaluate the mechanical properties of these two dampers under dynamic impact, a one-way coupling numerical method was proposed for simulation and analysis. Quasistatic experiments were used to verify the model based on magnetic field finite element (FE) and computational fluid dynamics (CFD). The model is also characterized by passive dynamic mesh and userdefined functions (UDF) based on C language. The results showed that the CFD models of both dampers were accurate. Though the colloidal damper is simpler in structure and lower in the cost, the MR damper has more significant damping and higher energy absorption ratio under impact. Compared with colloidal damper, MR damper is characterized by long working time, multiple vortices, chaotic streamlines and more uniform temperature distribution. When the power was continuously applied, the velocity of the impacted MR damper dropped to zero within 80ms, and the piston finally stopped at a stroke of 1.3mm. The colloidal damper reset within 8ms, and the reset velocity was 1.1m/s. In this study, the performance evaluation results of the two dampers were obtained, and the latest numerical methods for the mechanical performance analysis of colloidal dampers and MR dampers under dynamic impact were provided.

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Section: A Results Of Magnetic Field Fe Analysismentioning

confidence: 91%

“…According to the theoretical viscoplastic equation shown in [32], [33], the dynamic viscosity of Bingham fluid is defined by the hyperbolic tangent function, as shown in (4).…”

Section: B Properties Of Fluid Materialsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Liu

2020

IEEE Access

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“…These instances correspond to the time values of T =4 and 3T =4, where T is the period of oscillation. The slight shifting from that instance is due to fluid compressibility, inertia effects and the variation of the operating pressure (pre-charge pressure) in the damper (Elsaady et al, 2020a). The maximum force is seen in Figure 1(a) and (c) to be and (e) work diagrams at different frequencies of piston motion (measured at an amplitude of 15 mm and input current 0.5 A).…”

Section: Introductionmentioning

confidence: 95%

Study of failure symptoms of a single-tube MR damper using an FEA-CFD approach

Elsaady

Oyadiji

Nasser

2020

Journal of Intelligent Material Systems and Structures

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A new magnetorheological (MR) damper has been designed, manufactured, modelled and tested under cyclic loads. A faulty behaviour of the damper was accidentally detected during the experiments. It was deduced that the presence of air bubbles within the MR fluid is the main reason for that failure mode of the damper. The AMT-Smartec+ MR fluid used in the current study, a new MR fluid whose characteristics are not available in the literature, exhibits good magnetic properties. However, the fluid has a very high viscosity in the absence of magnetic field. It is assumed that this high viscosity enables the retention of air bubbles in the damper and causes the faulty behaviour. To prove this assumption, a coupled numerical approach has been developed. The approach incorporates a Finite Element Analysis (FEA) of the magnetic circuit and a Computational Fluid Dynamics (CFD) analysis of the fluid flow. A similar approach was presented in a previous publication in which an ideal behaviour of an MR damper (no effect of air bubbles) was investigated. The model has been modified in the current study to include the effect of air bubbles. The results were found to support the assumptions for the reasons of the failure symptoms of the current MR damper. The results are shown in a comparative way between the former and current studies to show the differences in flow parameters, namely: pressure, velocity and viscosity, in the faultless and faulty modes. The results indicate that the presence of air bubbles in MR dampers reduces the damper force considerably. Therefore, the effect of the high yield stress of MR fluids due to the magnetic field is reduced.

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Numerical analysis of a monotube mixed mode magnetorheological damper by using a new rheological approach in CFD

Kemerli

Engin

2020

Rheol Acta

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A one-way coupled numerical magnetic field and CFD simulation of viscoplastic compressible fluids in MR dampers

Cited by 43 publications

References 42 publications

Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Performance Evaluation of Dampers Under Dynamic Impact Based on Magnetic Field FE and CFD

Study of failure symptoms of a single-tube MR damper using an FEA-CFD approach

Numerical analysis of a monotube mixed mode magnetorheological damper by using a new rheological approach in CFD

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