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Keywords: turbulence
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Journal Articles
Article Type: Research-Article
J Biomech Eng. March 2022, 144(3): 031008.
Paper No: BIO-21-1111
Published Online: October 14, 2021
...-Newtonian behavior at higher shear rates. However, less is known about the impact of its multiphase nature on the transition to turbulence. In this study, we experimentally determined the critical Reynolds number at which the flow began to transition to turbulence downstream of eccentric stenosis for whole...
Journal Articles
Article Type: Research-Article
J Biomech Eng. June 2019, 141(6): 061001.
Paper No: BIO-17-1599
Published Online: April 22, 2019
... of transitional flow in aneurysms, turbulence has not received much attention. In this article, we investigate turbulence in the context of abdominal aortic aneurysms (AAA). Since the clinical practice is to diagnose an AAA on the basis of its size, hypothetical axisymmetric geometries of various sizes...
Journal Articles
Article Type: Research-Article
J Biomech Eng. January 2014, 136(1): 011005.
Paper No: BIO-13-1125
Published Online: November 27, 2013
... was found when riding with wider arm spacing. Such numerical studies on cyclists in a pace line are useful for determining the optimal cyclist sequence for team pursuit. CFD air flow aerodynamic interference wake turbulence Aerodynamic drag is responsible for 90% of the total resistance...
Journal Articles
Article Type: Research-Article
J Biomech Eng. January 2013, 135(1): 011003.
Paper No: BIO-12-1016
Published Online: December 27, 2012
..., 2012; accepted manuscript posted December 8, 2012; published online December 27, 2012. Assoc. Editor: Hai-Chao Han. 17 01 2012 09 10 2012 08 12 2012 Two turbulence intensity isosurfaces were chosen to illustrate each case: one at the highest level predicted and the second...
Journal Articles
Article Type: Research Papers
J Biomech Eng. May 2011, 133(5): 051001.
Published Online: April 7, 2011
...F. P. P. Tan; N. B. Wood; G. Tabor; X. Y. Xu In this study, two different turbulence methodologies are investigated to predict transitional flow in a 75% stenosed axisymmetric experimental arterial model and in a slightly modified version of the model with an eccentric stenosis. Large eddy...
Journal Articles
Article Type: Research Papers
J Biomech Eng. April 2011, 133(4): 041002.
Published Online: February 17, 2011
... mimicked the flow fields in several medical devices, consisted of a gradual flow constriction, a narrow throat region, and a sudden expansion region where a fluid jet exited the center of the nozzle with recirculation zones near the model walls. Measurements of mean velocity and turbulent flow quantities...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. October 2010, 132(10): 104503.
Published Online: September 27, 2010
... of diagnostic and predictive value. Recirculation zones, vortex shedding, and secondary flows are captured by both laminar and turbulent solutions. The forces on vessel walls are shown to correlate with unstable plaque deposits. Performing before and after studies of vessels in long-term radiology studies may...
Journal Articles
Article Type: Research Papers
J Biomech Eng. June 2010, 132(6): 061002.
Published Online: April 16, 2010
...Roland Gårdhagen; Jonas Lantz; Fredrik Carlsson; Matts Karlsson Large eddy simulation was applied for flow of Re = 2000 in a stenosed pipe in order to undertake a thorough investigation of the wall shear stress (WSS) in turbulent flow. A decomposition of the WSS into time averaged and fluctuating...
Journal Articles
Article Type: Research Papers
J Biomech Eng. May 2010, 132(5): 051007.
Published Online: March 29, 2010
... patient were analyzed based on computed tomography images acquired from the patient. Computational simulations of blood flow in the patient-specific model were performed by employing a correlation-based transitional version of Menter’s hybrid k - ε / k - ω shear stress transport turbulence model...
Journal Articles
Article Type: Research Papers
J Biomech Eng. March 2010, 132(3): 031009.
Published Online: February 17, 2010
... pediatric aorta. The three great vessels originating from the aortic arch— brachiocephalic (innominate), left common carotid, and left subclavian arteries—are included. An implicit large eddy simulation method based on a finite volume approach is used to study the resulting turbulent flow. A resistance...
Journal Articles
Article Type: Research Papers
J Biomech Eng. November 2009, 131(11): 111005.
Published Online: October 16, 2009
...Ning Yang; Steven Deutsch; Eric G. Paterson; Keefe B. Manning We use an implicit large eddy simulation (ILES) method based on a finite volume approach to capture the turbulence in the anastomoses of a left ventricular assist device (LVAD) to the aorta. The order-of-accuracy of the numerical schemes...
Journal Articles
Article Type: Research Papers
J Biomech Eng. February 2009, 131(2): 021007.
Published Online: December 10, 2008
...%. The present study revealed that turbulent air-particle flow may propagate to G5 for the assumed inhalation flow rate. Geometry and upstream effects are more pronounced for micron particle deposition than for nanoparticle deposition. Kleinstreuer , C. , Zhang , Z. , and Li , Z. , 2008...
Journal Articles
Article Type: Research Papers
J Biomech Eng. December 2008, 130(6): 061008.
Published Online: October 10, 2008
...F. P. P. Tan; G. Soloperto; S. Bashford; N. B. Wood; S. Thom; A. Hughes; X. Y. Xu In this study, newly developed two-equation turbulence models and transitional variants are employed for the prediction of blood flow patterns in a diseased carotid artery where the growth, progression, and structure...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. February 2008, 130(1): 014503.
Published Online: February 14, 2008
...Sonu S. Varghese; Steven H. Frankel; Paul F. Fischer Mean flow predictions obtained from a host of turbulence models were found to be in poor agreement with recent direct numerical simulation results for turbulent flow distal to an idealized eccentric stenosis. Many of the widely used turbulence...
Journal Articles
Article Type: Research Papers
J Biomech Eng. February 2008, 130(1): 011008.
Published Online: February 7, 2008
... geometric simplifications of the realistic model. A validated low Reynolds number k - ω turbulence model was employed to simulate laminar, transitional, and fully turbulent flow regimes for the transport of 1–200 nm particles. Results of this study indicate that the geometric simplifications considered did...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. February 2007, 129(1): 40–50.
Published Online: July 28, 2006
...J. Banks; N. W. Bressloff Under normal healthy conditions, blood flow in the carotid artery bifurcation is laminar. However, in the presence of a stenosis, the flow can become turbulent at the higher Reynolds numbers during systole. There is growing consensus that the transitional k − ω model...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. October 2005, 127(5): 782–797.
Published Online: March 31, 2005
... different Reynolds numbers, one in the laminar regime and the other turbulent (near-peak systole flow rate), are investigated. A direct numerical simulation is carried out for the laminar flow case while the turbulent flow is investigated with two different unsteady statistical turbulence modeling...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. December 2004, 126(6): 714–726.
Published Online: February 4, 2005
..., was identified by the location of vortical structures and level of coherence corresponding to a significant variation in the turbulence level distribution inside the LV. The adverse effect of these observations could potentially compromise the efficiency of the LV and result in flow patterns that deviate from...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. October 2004, 126(5): 604–613.
Published Online: November 23, 2004
... experimental results and computational data of the adult model to determine solution validity. It was found that numerical simulations can provide an accurate representation of axial velocities and turbulence intensity. Data on flow resistance, axial velocities, secondary velocity vectors, and turbulent...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. October 2004, 126(5): 578–584.
Published Online: November 23, 2004
...B. A. Younis; S. A. Berger Difficulties in predicting the behavior of some high Reynolds number flows in the circulatory system stem in part from the severe requirements placed on the turbulence model chosen to close the time-averaged equations of fluid motion. In particular, the successful...