Investigation on vibration of single-walled carbon nanotubes by variational iteration method

Asoor, A. A. Ahmadi; Valipour, P.; Ghasemi, S. E.

doi:10.1007/s13204-015-0416-8

Cited by 24 publications

(4 citation statements)

References 28 publications

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“…Computational technique widely developed for solving engineering problems. [38][39][40][41][42][43][44][45][46][47][48][49] Besides, this methodology is extensively used for the energy harvesting [50][51][52][53][54] and evaluation of proposed efficient systems in the aerospace applications. [55][56][57][58][59][60][61]…”

Section: Validation and Verification Of Resultsmentioning

confidence: 99%

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Rostamian

Maddah

Rostamiyan

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Flame stabilization distribution and efficient fuel mixing are highly significant in the performance of ramjet engine. In this paper, numerical studies are done to investigate the supersonic combustion of hydrogen and air co-flow in presence of the ramp edge. In this study, flame maintenance and combustion formation in a dual-combustion ramjet engine are fully investigated. The primary emphasis of this work is to disclose the impact of produced shocks due to the existence of ramp edge on the structure of fuel and air-jet immediately downstream of injector. The shock interactions of two different angles (10 deg and 30 deg) of the ramp edge are investigated. Favre-averaged conservation equations are considered for the simulation of compressible flows inside the combustor. Various mechanisms expressing the flame spreading characteristics are also examined. Depending on the angle of the ramp edge, the produced shock waves influence on size and strength of vortices. Our findings also show that high angles of ramp edge augment the fluctuation of the vortices by the splitter and consequently, fuel mixing enhances in the combustion chamber of ramjet engine. Our findings also confirm that the similar jet pressure would be more effective on the vortex production downstream of the splitter. The application of ramp edge with angle of 30 deg would increase average momentum thickness of the mixing layer up to 55%.

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Section: Validation and Verification Of Resultsmentioning

confidence: 99%

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Rostamian

Maddah

Rostamiyan

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…These methods have their own cons and pros and comparison of these techniques are seldom reported for ICA aneurysms 39 – 44 . This study tries to investigate the effects of these two techniques on hemodynamic factors.…”

Section: Introductionmentioning

confidence: 99%

Reduction of rupture risk in ICA aneurysms by endovascular techniques of coiling and stent: numerical study

Rostamian

Fallah

Rostamiyan

2023

Sci Rep

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The initiation, growth, and rupture of cerebral aneurysms are directly associated with Hemodynamic factors. This report tries to disclose effects of endovascular technique (coiling and stenting) on the quantitative intra-aneurysmal hemodynamic and the rupture of cerebral aneurysms. In this paper, Computational Fluid Dynamic are done to investigate and compare blood hemodynamic inside aneurysm under effects of deformation (due to stent) and coiling of aneurysm. The blood stream inside the sac of aneurysm as well as pressure and OSI distribution on the aneurysm wall are compared in nine cases and results of two distinctive cases are compared and reported. Obtained results specifies that the mean WSS is reduced up to 20% via coiling of the aneurysm while the deformation of the aneurysm (applying stent) could reduce the mean WSS up to 71%. In addition, comparison of the blood hemodynamic shows that the blood bifurcation occurs in the dome of aneurysm when endovascular technique for the treatment is not applied. It is found that the bifurcation occurs at ostium section when ICA aneurysm is deformed by the application of stent. The impacts of coiling are mainly limited since the blood flow entrance is not limited in this technique and WSS is not reduced substantial. However, usage of stent deforms the aneurysm angle with the orientation of parent vessel and this reduces blood velocity at entrance of the ostium and consequently, WSS is decreased when deformation of the aneurysm fully occurs. These qualitative procedures provide a preliminary idea for more profound quantitative examination intended for assigning aneurysm risk of upcoming rupture.

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“…The equations of the model were solved by the generalized differential quadrature method. Ahmadi et al (2016) [28] used the variational iteration method to investigate the nonlinear vibration of SWNT based on the nonlocal Timoshenko beam theory. The behavior of deflection and frequency in vibrations of SWNT were examined.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Behavior of Single Walled Carbon Nanotube Reinforced Aluminium Alloy Beam

Selmi

2021

JNanoR

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This paper aims to analyze the nonlinear vibration of clamped-clamped buckled beams made of Aluminium alloy (Al-alloy) reinforced with uniformly dispersed Single Walled Carbon Nanotube (SWNT). The mean field homogenization technique is used to predict the effective material properties of the beams. The equation of motion governing the nonlinear behavior is solved using an exact method. The effects of various parameters including axial load, vibration amplitude, SWNT volume fraction, SWNT aspect ratio and beam slenderness ratio on the nonlinear frequency and on the phase trajectory plots for pre- and post-buckling states are studied.

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Investigation on vibration of single-walled carbon nanotubes by variational iteration method

Cited by 24 publications

References 28 publications

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Reduction of rupture risk in ICA aneurysms by endovascular techniques of coiling and stent: numerical study

Nonlinear Behavior of Single Walled Carbon Nanotube Reinforced Aluminium Alloy Beam

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