Large Eddy Simulation of Stenotic Flow for Wall Shear Stress Estimation - Validation and Application
2011 (English)In: WSEAS Transactions on Biology and Biomedicine, ISSN 1109-9518, Vol. 8, no 3, 86-101 p.Article in journal (Refereed) Published
Turbulent flow in the cardiovascular system may increase the risk for severe arterial disease. This workaddresses the feasibility of Large Eddy Simulation (LES) using a general purpose code as a tool for assessmentof cardiovascular flow and investigates Wall Shear Stress (WSS) in steady as well as pulsating turbulent pipeflow. Poiseuille flow was specified at the inlet, and with a suitable ammount of perturbations at the inlet it waspossible to predict experimental data. The extent of the recirculation zone was affected by the inlet disturbances,and magnitude as well as direction of the WSS vector varied significantly at the reattachment point. For thepulsating flow, WSS shows a complex pattern with different spatial and temporal variation along the pipe. Thewall shear stress gradient was calculated on the entire post-stenotic surface and each component in the gradientwas investigated. The off-diagonal components in the gradient are usually assumed to be small, but here they werefound to be on the same order of magnitude as the diagonal terms. This work demonstrates the need for a scaleresolving simulation technique to accurately model cardiovascular flows.
Place, publisher, year, edition, pages
2011. Vol. 8, no 3, 86-101 p.
Turbulence, Large Eddy Simulation, Cardiovascular Flow, Wall Shear Stress
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:liu:diva-73211OAI: oai:DiVA.org:liu-73211DiVA: diva2:469105