Junjie Jia¹, Cuiru Sun^1,*

Molecular & Cellular Biomechanics, Vol.16, Suppl.1, pp. 61-64, 2019, DOI:10.32604/mcb.2019.05736

Abstract Intravascular optical coherence tomography (IVOCT) has been employed to clinical coronary imaging for several years. But the influence of flushing and OCT catheter to the blood vessel biomechanical properties have not been studied. In this paper, IVOCT imaging is integrated with the fluid-structure interaction (FSI) simulation to study the blood flow velocity and the stress distribution of a porcine carotid artery during IVOCT imaging. 3D geometric model is built based on the in vivo OCT images, and a hyperelastic model is employed for the material properties of the vascular wall. The blood flow profile and wall stress distributions under various… More >

Longling Fan¹, Jing Yao², Chun Yang³, Di Xu², Dalin Tang^1,4,*

Molecular & Cellular Biomechanics, Vol.16, Suppl.1, pp. 41-41, 2019, DOI:10.32604/mcb.2019.05720

Abstract Cardiac pacing has been an effective treatment in the management of patients with arrhythmia. Different pacemaker location may have different impact on pacemaker effectiveness. A novel image-based ventricle animal modeling approach was proposed to integrate echocardiography images, propagating dynamic electric potential on ventricle surface to perform myocardial function assessment. The models will be used to simulate ventricular electrical signal conduction and optimize pacemaker location for better cardiac outcome. One health female adult pig weight 42.5 kg was used to make pacing animal model with different ventricle pacing locations. Pig health status was assessed before undergoing experimental procedures. Ventricle surface electric… More >

Minato Onishi¹, Daisuke Ishihara^1,*

CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.1, pp. 145-175, 2019, DOI:10.32604/cmes.2019.06781

Abstract This study proposed a partitioned method to analyze maneuvering of insects during flapping flight. This method decomposed the insect flapping flight into wing and body subsystems and then coupled them via boundary conditions imposed on the wing’s base using one-way coupling. In the wing subsystem, the strong coupling of the flexible wings and surrounding fluid was accurately analyzed using the finite element method to obtain the thrust forces acting on the insect’s body. The resulting thrust forces were passed from the wing subsystem to the body subsystem, and then rigid body motion was analyzed in the body subsystem. The rolling,… More >

Longling Fan^1,*, Jing Yao ^{2, *}, Chun Yang³, Di Xu², Dalin Tang^{1, 4, §}

CMES-Computer Modeling in Engineering & Sciences, Vol.114, No.2, pp. 221-237, 2018, DOI:10.3970/cmes.2018.114.221

Abstract Understanding cardiac blood flow behaviors is of importance for cardiovascular research and clinical assessment of ventricle functions. Patient-specific Echo-based left ventricle (LV) fluid-structure interaction (FSI) models were introduced to perform ventricle mechanical analysis, investigate flow behaviors, and evaluate the impact of myocardial infarction (MI) and hypertension on blood flow in the LV. Echo image data were acquired from 3 patients with consent obtained: one healthy volunteer (P1), one hypertension patient (P2), and one patient who had an inferior and posterior myocardial infarction (P3). The nonlinear Mooney-Rivlin model was used for ventricle tissue with material parameter values chosen to match echo-measure… More >

Dalin Tang¹, Chun Yang², Satya Atluri³

The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 67-68, 2011, DOI:10.3970/icces.2011.018.067

Abstract Cardiovascular disease is the leading cause of death worldwide. Many victims of the disease died suddenly without prior symptoms. It is a great challenge for clinicians and researchers to develop screening techniques and assessment methodologies to identify those patients for early treatment and prevention of the fatal clinical event. Considerable effort has been devoted investigating mechanisms governing atherosclerotic plaque progression and rupture [Friedman, Bargeron, Deters, Hutchins and Mark (1987); Friedman and Giddens (2005); Giddens, Zarins, Glagov, S. (1993); Ku, Giddens, Zarins and Glagov (1985); Gibson et al. (1993); Liu and Tang (2010); Stone et al. (2003); Yang, Tang, Atluri et… More >

Mingchao Cai, Chun Yang, Mehmet H. Kural, Richard Bach, David Muccigrosso, Deshan Yang, Jie Zheng, Kristen L. Billiar, Dalin Tang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 97-104, 2011, DOI:10.3970/icces.2011.019.097

Abstract Image-based computational modeling has been introduced for vulnerable atherosclerotic plaques to identify critical mechanical conditions which may be used for better risk assessment and rupture predictions. In vivo patient-specific coronary plaque models are lagging due to limitations on non-invasive image resolution, flow data, and vessel material properties. We propose a procedure where intravascular ultrasound (IVUS) imaging, biaxial mechanical testing and computational modeling are combined together to acquire better and more complete plaque data and make more accurate plaque vulnerability assessment and predictions. More >

X.H. Du, X.P. Shen

The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.3, pp. 81-82, 2011, DOI:10.3970/icces.2011.016.081

Abstract Aim of this paper is to simulate the fluid-structure interaction of liquefied natural gas (LNG) prestressed storage tank under seismic influence. The coupled Eulerian-Lagrangian (CEL) analysis technique is used to simulate the hydrodynamic interaction between LNG and the cylinder of LNG prestressed storage tank. The 3-D model of LNG has been dispersed by Eulerian mesh which is different from traditional added mass analysis method. Meanwhile, both of the 3-D models of prestressed rebar and concrete structure are dispersed by Lagrangian mesh. Following conclusions are obtained: 1) Natural frequency of the whole model has been obtained by using the Block Lanczos… More >

D. Ishihara

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 66-66, 2019, DOI:10.32604/icces.2019.05888

Abstract This study shows that some of important characteristic motions in insect flapping wings can be created by the fluid-structure interaction. A lumped flexibility model is used to describe the flexibilities in insect’s wings. A three-dimensional finite element method for the fluid-structure interaction analyzes the behaviors of the model wing, the surrounding fluid, and their interaction, where the dynamic similarity law for the fluid-structure interaction is used to incorporate actual insect data. This finite element method uses the projection and parallel computation algorithms, which perform the systematic parametric study efficiently. The elastic recoil and the modes in the path of the… More >

Tomonori Yamada^*, Yuki Yamamoto, Giwon Hong, Shinobu Yoshimura

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 61-61, 2019, DOI:10.32604/icces.2019.05386

Abstract This paper describes performance study of a mesh moving technique with minimum-height-based stiffening for robust fluid-structure interaction (FSI) analysis with large deformation. The authors have been developing a general purpose parallel FSI analysis system for large scale problems with interface tracking approach and applied it to the analyses of flapping motion of micro air vehicles, fuel assemblies of the boiling water reactors under seismic loading, wind turbines and so on. The practical use of FSI analysis system requires the robustness for the parametric design of various mechanical systems. In this context, mesh moving technique is a key for avoiding the… More >

Doan An¹, Jae-Woo Lee², Sang Ho Kim¹, Yung-Hwan Byun¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 35-36, 2009, DOI:10.3970/icces.2009.011.035

Abstract As analysis methods for the individual CFD (Computational Fluid Dynamics) and FEM (Finite Element Method) analyses are matured, many researches are going on recently and several commercial software are available and ready to use, but the application of the method is limited to the specific or relatively simple geometry. When the configuration geometry is complex or operating conditions are difficult to impose, the meshing and re-meshing process between aerodynamic analysis and FEM analysis is not an easy task and commercial software have limitations to be applied to the specific problems.
Therefore, in this study, the aerodynamics-structure coupled analysis for the… More >