New Frontiers With the very wide use of ADINA at present, we are sometimes pleasantly surprised seeing, by chance, a paper focusing on a very interesting study conducted with ADINA! In this News we present some interesting biomechanics-related applications in which the multiphysics capabilities are used:
In this study, the obstructive sleep apnea syndrome was considered. This is a sleep-related breathing disorder characterized by repetitive pharyngeal collapse and reopening in the oral and nasal cavity. A full 3D finite element model of the airway, skull, neck, hyoid and soft tissues surrounding the upper airway was used based on CT data of a patient.
The second figure shows the finite element model where different materials are depicted with different colors. Using this finite element model, a transient fluid-structure interaction analysis was performed to study the mechanism of the collapse of pharyngeal during inspiration, which is believed to be responsible for this syndrome.
In this study, based on MRI images of a human subject, a 3D finite element model of the cerebrospinal fluid flow inside the central nervous system was developed. The interaction between the cerebrospinal fluid flow and the deformation of the brain tissues during the flow cycles was studied. The results were found to be in excellent agreement with the experimental data. Understanding the mechanism of cerebrospinal flow is an important step for designing drug delivery methods to the central nervous system.
For a similar study, see here.
Atherosclerosis at the carotid bifurcation is a major risk factor for stroke. This study presented a comparison between carotid atheroma rupture observed in vivo and the plaque stress distribution obtained from a fluid-structure interaction analysis based on pre-rupture medical imaging. A good correlation was found between the region of pronounced elevation in stress within the fibrous plaque layer of the lesion, and the location and extent of the observed site of plaque rupture.
For a similar study, see here.
The aerodynamic characteristics of hovering flight of the Coleopteran beetle (species with flexible hind wings and stiff fore wings) was investigated. The flapping wing kinematics of the Coleopteran insect was modeled through experimental observations using high-speed digital camera photography. The kinematic data was used in the fluid-structure interaction analysis of the flapping wings during the hovering flight.
The motivation of this study is to design small biomimetic flying devices, the so-called micro air vehicles.
For a similar study, see here.
The knowledge of local vascular anatomy and function in the human body is of great interest for the diagnosis and treatment of cardiovascular disease. A comprehensive analysis of the hemodynamics in the thoracic aorta is presented based on the integration of flow-sensitive 4D MRI with state-of-the-art rapid prototyping technology and computational fluid dynamics (CFD). Rapid prototyping was used to transform aortic geometries as measured by contrast-enhanced MR angiography into realistic vascular models with large anatomical coverage. Integration into a flow circuit with patient-specific pulsatile in-flow conditions and application of flow-sensitive 4D MRI permitted detailed analysis of local and global 3D flow dynamics in a realistic vascular geometry. The results indicate the potential of such patient-specific model systems for detailed experimental simulation of realistic vascular hemodynamics.
Cerebral aneurysms are pathologic dilations of an artery, generally found in the anterior and posterior regions of the circle of Willis. Rupture of a cerebral aneurysm causes subarachnoid hemorrhage with potentially severe neurologic complications. Hemodynamics plays an important role in the progression and rupture of cerebral aneurysms. This study describes the blood flow dynamics and fluid–structure interaction in seven patient-specific models of bifurcating cerebral aneurysms located in the anterior and posterior circulation regions of the circle of Willis. The models were obtained from 3D rotational angiography image data, and blood flow dynamics and fluid–structure interaction were studied under physiologically representative waveform of inflow. The arterial wall was assumed to be elastic, isotropic and homogeneous. The flow was assumed to be laminar, non-Newtonian and incompressible.
You can search through more than 700 publications with reference to the use of ADINA on our Publications page.
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