ArticleCardiovascular engineering and technology2021
Equivalent Scalar Stress Formulation Taking into Account Non-Resolved Turbulent Scales.
Article in Cardiovascular engineering and technology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Impact of Inflow Ratio on a Double-Inflow Cavopulmonary Assist Device.ASAIO journal (American Society for Artificial Internal Organs : 1992) · 2026Article
- Numerical Analyses of Blood Pumps Under Realistic Operating Conditions.ASAIO journal (American Society for Artificial Internal Organs : 1992) · 2026Article
- Machine learning based on computational fluid dynamics enables geometric design optimisation of the NeoVAD blades.Scientific reports · 2023Article
- Flow simulation-based particle swarm optimization for developing improved hemolysis models.Biomechanics and modeling in mechanobiology · 2023Article
- A Continuum Model for the Unfolding of von Willebrand Factor.Annals of biomedical engineering · 2021Article
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Abstract
purposeCardiovascular engineering includes flows with fluid-dynamical stresses as a parameter of interest. Mechanical stresses are high-risk factors for blood damage and can be assessed by computational fluid dynamics. By now, it is not described how to calculate an adequate scalar stress out of turbulent flow regimes when the whole share of turbulence is not resolved by the simulation method and how this impacts the stress calculation.
methodsWe conducted direct numerical simulations (DNS) of test cases (a turbulent channel flow and the FDA nozzle) in order to access all scales of flow movement. After validation of both DNS with literature und experimental data using magnetic resonance imaging, the mechanical stress is calculated as a baseline. Afterwards, same flows are calculated using state-of-the-art turbulence models. The stresses are computed for every result using our definition of an equivalent scalar stress, which includes the influence from respective turbulence model, by using the parameter dissipation. Afterwards, the results are compared with the baseline data.
resultsThe results show a good agreement regarding the computed stress. Even when no turbulence is resolved by the simulation method, the results agree well with DNS data. When the influence of non-resolved motion is neglected in the stress calculation, it is underpredicted in all cases.
conclusionWith the used scalar stress formulation, it is possible to include information about the turbulence of the flow into the mechanical stress calculation even when the used simulation method does not resolve any turbulence.
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