IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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Computational Fluid Dynamics Challenge for Rupture-Prediction in Intracranial Aneurysms, Germany
The participants are free to choose their computational model, software, boundary condition etc.

In the recent years various simulation challenges have been organized in order to check the applicability of the computational hemodynamics for intracranial aneurysms. Radaelli et al. [1] performed a comparison for virtually stented patient-specific cases using flow diverters. Steinman et al. [2] compared the velocity and pressure values obtained by various groups in a giant aneurysm. One of the main difficulties when performing computational fluid dynamics. (CFD) for patient-specific cases is the prediction of the rupture probability. The current challenge involves two patient-specific MCA-aneurysms that should be analyzed by CFD in a blind test. One of the provided data sets corresponds to a ruptured aneurysm, while the other one can be considered as unruptured. The ruptured case is documented with intra-operative video recording.   
Therefore, the exact ruptured site of the aneurysm is known.  
More info here.
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