MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Computers and Structures' source. Sat, 30 Jul 2011 04:18:31 +0100 http://www.medworm.com/index.php?rid=5045767&cid=s_38112_79_f&fid=38112&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21765559%26dopt%3DAbstract Authors: Tang D, Yang C, Geva T, Gaudette G, Del Nido PJ Multi-physics right and left ventricle (RV/LV) fluid-structure interaction (FSI) models were introduced to perform mechanical stress analysis and evaluate the effect of patch materials on RV function. The FSI models included three different patch materials (Dacron scaffold, treated pericardium, and contracting myocardium), two-layer construction, fiber orientation, and active anisotropic material properties. The models were constructed based on cardiac magnetic resonance (CMR) images acquired from a patient with severe RV dilatation and solved by ADINA. Our results indicate that the patch model with contracting myocardium leads to decreased stress level in the patch area, improved RV function and patch area contractility. PMI... Computers and Structures journals http://www.medworm.com/rss/comments.php?id=5045767 Tue, 31 May 2011 23:00:00 +0100 5045767 http://www.medworm.com/index.php?rid=4853751&cid=s_38112_79_f&fid=38112&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21572557%26dopt%3DAbstract Authors: Liu A, Nickerson A, Troyer A, Yin X, Cary R, Thornburg K, Wang R, Rugonyi S Wall shear stresses (WSS) exerted by blood flow on cardiac tissues modulate growth and development of the heart. To study the role of hemodynamic conditions on cardiac morphogenesis, here, we present a methodology that combines imaging and finite element modeling to quantify the in vivo blood flow dynamics and WSS in the cardiac outflow tract (OFT) of early chicken embryos (day 3 out of 21-day incubation period). We found a distinct blood flow field and heterogeneous distribution of WSS in the chicken embryonic heart OFT, which have physiological implications for OFT morphogenesis. PMID: 21572557 [PubMed - as supplied by publisher] (Source: Computers and Structures) Computers and Structures journals http://www.medworm.com/rss/comments.php?id=4853751 Tue, 24 May 2011 13:45:06 +0100 4853751 http://www.medworm.com/index.php?rid=1820156&cid=s_38112_79_f&fid=38112&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D18496602%26dopt%3DAbstract Authors: Xia G, Lin CL A new cell-vortex unstructured finite volume method for structural dynamics is assessed for simulations of structural dynamics in response to fluid motions. A robust implicit dual-time stepping method is employed to obtain time accurate solutions. The resulting system of algebraic equations is matrix-free and allows solid elements to include structure thickness, inertia, and structural stresses for accurate predictions of structural responses and stress distributions. The method is coupled with a fluid dynamics solver for fluid-structure interaction, providing a viable alternative to the finite element method for structural dynamics calculations. A mesh sensitivity test indicates that the finite volume method is at least of second-order accuracy. The method is va... Computers and Structures journals http://www.medworm.com/rss/comments.php?id=1820156 Tue, 01 Apr 2008 04:00:00 +0100 1820156 http://www.medworm.com/index.php?rid=1820157&cid=s_38112_79_f&fid=38112&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D18037975%26dopt%3DAbstract Authors: Moghani T, Butler JP, Lin JL, Loring SH In the serosal cavities (e.g. pleural, pericardial) soft tissues slide against each other, lubricated by thin fluid. We used rotational devices to study the tribology of such tissues, which appear to exhibit mixed and hydrodynamic lubrication. To explore mechanism, we modeled the interaction of fluid and soft material in 3D using a simple cylindrical geometry with an uneven solid-fluid interface in rotation. Deformation of the solid, frictional force, and fluid thickness are presented as a function of applied rotational velocity, applied normal load and material properties. The results suggest that the deformation caused by hydrodynamic pressure leads to load-supporting behavior. PMID: 18037975 [PubMed - as supplied by publisher] (So... Computers and Structures journals http://www.medworm.com/rss/comments.php?id=1820157 Fri, 01 Jun 2007 04:00:00 +0100 1820157