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Variability of computational fluid dynamics solutions for pressure and flow in a giant aneurysm: the ASME 2012 summer bioengineering conference CFD challenge

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HPC-UGent: the central High Performance Computing infrastructure of Ghent University
Abstract
Stimulated by a recent controversy regarding pressure drops predicted in a giant aneurysm with a proximal stenosis, the present study sought to assess variability in the prediction of pressures and flow by a wide variety of research groups. In phase I, lumen geometry, flow rates, and fluid properties were specified, leaving each research group to choose their solver, discretization, and solution strategies. Variability was assessed by having each group interpolate their results onto a standardized mesh and centerline. For phase II, a physical model of the geometry was constructed, from which pressure and flow rates were measured. Groups repeated their simulations using a geometry reconstructed from a micro-computed tomography (CT) scan of the physical model with the measured flow rates and fluid properties. Phase I results from 25 groups demonstrated remarkable consistency in the pressure patterns, with the majority predicting peak systolic pressure drops within 8% of each other. Aneurysm sac flow patterns were more variable with only a few groups reporting peak systolic flow instabilities owing to their use of high temporal resolutions. Variability for phase II was comparable, and the median predicted pressure drops were within a few millimeters of mercury of the measured values but only after accounting for submillimeter errors in the reconstruction of the life-sized flow model from micro-CT. In summary, pressure can be predicted with consistency by CFD across a wide range of solvers and solution strategies, but this may not hold true for specific flow patterns or derived quantities. Future challenges are needed and should focus on hemodynamic quantities thought to be of clinical interest.
Keywords
BLOOD-FLOW, WALL DYNAMICS, HEMODYNAMICS, SIMULATIONS, VALIDATION, MODEL

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Chicago
Steinman, David A, Yiemeng Hoi, Paul Fahy, Liam Morris, Michael T Walsh, Nicolas Aristokleous, Andreas S Anayiotos, et al. 2013. “Variability of Computational Fluid Dynamics Solutions for Pressure and Flow in a Giant Aneurysm: The ASME 2012 Summer Bioengineering Conference CFD Challenge.” Journal of Biomechanical Engineering-transactions of the Asme 135 (2).
APA
Steinman, D. A., Hoi, Y., Fahy, P., Morris, L., Walsh, M. T., Aristokleous, N., Anayiotos, A. S., et al. (2013). Variability of computational fluid dynamics solutions for pressure and flow in a giant aneurysm: the ASME 2012 summer bioengineering conference CFD challenge. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 135(2).
Vancouver
1.
Steinman DA, Hoi Y, Fahy P, Morris L, Walsh MT, Aristokleous N, et al. Variability of computational fluid dynamics solutions for pressure and flow in a giant aneurysm: the ASME 2012 summer bioengineering conference CFD challenge. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME. 2013;135(2).
MLA
Steinman, David A, Yiemeng Hoi, Paul Fahy, et al. “Variability of Computational Fluid Dynamics Solutions for Pressure and Flow in a Giant Aneurysm: The ASME 2012 Summer Bioengineering Conference CFD Challenge.” JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME 135.2 (2013): n. pag. Print.
@article{3180372,
  abstract     = {Stimulated by a recent controversy regarding pressure drops predicted in a giant aneurysm with a proximal stenosis, the present study sought to assess variability in the prediction of pressures and flow by a wide variety of research groups. In phase I, lumen geometry, flow rates, and fluid properties were specified, leaving each research group to choose their solver, discretization, and solution strategies. Variability was assessed by having each group interpolate their results onto a standardized mesh and centerline. For phase II, a physical model of the geometry was constructed, from which pressure and flow rates were measured. Groups repeated their simulations using a geometry reconstructed from a micro-computed tomography (CT) scan of the physical model with the measured flow rates and fluid properties. Phase I results from 25 groups demonstrated remarkable consistency in the pressure patterns, with the majority predicting peak systolic pressure drops within 8\% of each other. Aneurysm sac flow patterns were more variable with only a few groups reporting peak systolic flow instabilities owing to their use of high temporal resolutions. Variability for phase II was comparable, and the median predicted pressure drops were within a few millimeters of mercury of the measured values but only after accounting for submillimeter errors in the reconstruction of the life-sized flow model from micro-CT. In summary, pressure can be predicted with consistency by CFD across a wide range of solvers and solution strategies, but this may not hold true for specific flow patterns or derived quantities. Future challenges are needed and should focus on hemodynamic quantities thought to be of clinical interest.},
  articleno    = {021016},
  author       = {Steinman, David A and Hoi, Yiemeng and Fahy, Paul and Morris, Liam and Walsh, Michael T and Aristokleous, Nicolas and Anayiotos, Andreas S and Papaharilaou, Yannis and Arzani, Amirhossein and Shadden, Shawn C and Berg, Philipp and Janiga, Gabor and Bols, Joris and Segers, Patrick and Bressloff, Neil W and Cibis, Merih and Gijsen, Frank H and Cito, Salvatore and Pallareacutes, Jordi and Browne, Leonard D and Costelloe, Jennifer A and Lynch, Adrian G and Degroote, Joris and Vierendeels, Jan and Fu, Wenyu and Qiao, Aike and Hodis, Simona and Kallmes, David F and Kalsi, Hardeep and Long, Quan and Kheyfets, Vitaly O and Finol, Ender A and Kono, Kenichi and Malek, Adel M and Lauric, Alexandra and Menon, Phrahlad G and Pekkan, Kerem and Moghadam, Mahdi Esmaily and Marsden, Alison L and Oshima, Marie and Katagiri, Kengo and Peiffer, Veronique and Mohamied, Yumnah and Sherwin, Spencer J and Schaller, Jens and Goubergrits, Leonid and Usera, Gabriel and Mendina, Mariana and Valen-Sendstad, Kristian and Habets, Damiaan F and Xiang, Jianping  and Meng, Hui and Yu, Yue and Karniadakis, George E and Shaffer, Nicholas and Loth, Francis},
  issn         = {0148-0731},
  journal      = {JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME},
  keyword      = {BLOOD-FLOW,WALL DYNAMICS,HEMODYNAMICS,SIMULATIONS,VALIDATION,MODEL},
  language     = {eng},
  number       = {2},
  pages        = {13},
  title        = {Variability of computational fluid dynamics solutions for pressure and flow in a giant aneurysm: the ASME 2012 summer bioengineering conference CFD challenge},
  url          = {http://dx.doi.org/10.1115/1.4023382},
  volume       = {135},
  year         = {2013},
}

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