Instructions for VISC11
=======================

Authors: Salvatore Cito and Arjan Geers (ajgeers@gmail.com)

Participants are provided with STL surface meshes (unit of length: millimeters) of the vascular geometry and the deployed stent geometries, flow rate boundary conditions at inlets and outlets, and blood properties. They are invited to simulate the steady-state velocity field in the aneurysm assuming blood to be an incompressible Newtonian fluid and the vessel wall to be rigid with a no-slip boundary condition.


Stent Configurations
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Besides simulating the velocity field for the untreated aneurysm (case 0), the velocity field has to be simulated for the aneurysm virtually treated with high-porosity stents (cases 1 to 5). Clinicians from the Hospital Clínic, Barcelona, Spain proposed five different stent configurations composed of the Neuroform (Boston Scientific, Natick, MA, USA) open cell stent (OCS) and the Enterprise (Cordis, Miami Lakes, FL) closed cell stent (CCS):
- Case 0: untreated
- Case 1: ocs_left.stl and ocs_right.stl
- Case 2: ccs_left.stl and ccs_right.stl
- Case 3: ocs_left.stl and ccs_right.stl
- Case 4: ccs_left.stl and ocs_right.stl
- Case 5: ccs_center.stl


Flow rate boundary conditions
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(Please note that the flow rates and corresponding Reynolds numbers reported in Cito et al., Annals of Biomedical Engingeering, 2015 are off by a factor of 10. Below are the correct flow rates that were provided to the challenge participants.)
 
- Inlet 1: 14.135e-4 kg/s
- Inlet 2: 4.001e-4 kg/s
- Outlet 1: 5.201e-4 kg/s
- Outlet 2: 5.730e-4 kg/s
- Outlet 3: 7.201e-4 kg/s

See geometry.pdf for references to inlet and outlet locations.


Blood properties
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- Newtonian fluid
- Viscosity = 0.00645 Pa s
- Density = 1054 kg/m^3


Output
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Participants are invited to submit an abstract to the 8th International Interdisciplinary Cerebrovascular Symposium (ICS) 2011, Shanghai, China with:
- Details of the CFD methodology
- Mesh dependency analysis for the CFD simulations
- Contour plots of the in-plane velocity on the xy-plane at z = 0 mm
- Plots of the xy-velocity along the y-axis
- Interpretation of the performance of each stent configuration

(Note: contour plots of the out-of-plane velocity on the yz-plane at x = 3 mm were later added for the journal paper.)