Anna Lancmanová (TU Prag): Influence of momentum flux correction coefficient in 2D-1D coupling

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• Meeting ID:962 1709 1997
• Passcode:cauchy
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• Speaker:Ing. Anna Lancmanová (TU Prag)
• Title:Influence of momentum flux correction coefficient in 2D-1D coupling

Abstract:  This work is motivated by the air flow in the human respiratory system, although similar problems are also common in other areas of biomedical, environmental or industrial fluid mechanics.

Some selected results regarding the implementation, validation and testing of a simple 2D-1D coupled model designed to capture some essential features of the oscillatory air flow in human respiratory system will be presented. The model relies on a 2D flow model solved by a simple finite-difference scheme in the immersed boundary setting. This model is coupled to a simplified 1D fluid-structure-interaction model simulating the flow in a tube with elastic walls. A series of numerical tests based on coupled model was performed in order to evaluate its sensibility to selected parameters. From these parameters, influence of momentum flux correction coefficient, defined as the ratio of momentum flux based on actual velocity to momentum flux obtained using averaged velocity profile across a given section, will be discussed in detail.

References:  [1] Ahookhosh, K.,Pourmehran, O., Aminfar, H., Mohammadpourfard, M., Sarafraz, M., Hamishehkar, H. Development of human respiratory airway models: A review. Eur J Pharm Sci. 2020 Mar 30;145:105233. doi: 10.1016/j.ejps.2020.105233. Epub 2020 Jan 21. PMID: 31978589.
[2] Shang, Y, Dong, J., Tian, L., Inthavong, K., Tu, J. Detailed computational analysis of flow dynamics in an extended respiratory airway model. Clinical Biomechanics, 61:105–111, 2019.
[3] Roth, C.J., (2017). Multi-dimensional Coupled Computational Modeling in Respiratory Biomechanics. Dissertation. Technische Universität München
[4] Florens, M., Sapoval, B., and Filoche, M. An anatomical and functional model of the human tracheobronchial tree. Journal of Applied Physiology 110, 3 (2011), 756–763. PMID: 21183626.
[5] Formaggia, L., Veneziani, A. Reduced and multiscale models for the human cardiovascular system. Technical Report, VKI Lecture Series on Biological Fluid Dynamics, Milano, 2003.
[6] Lambert, R. K., Wilson, T. A., Hyatt, R. E., and Rodarte, J. R. A computational model for expiratory flow. Journal of Applied Physiology 52, 1 (1982), 44–56. PMID: 7061277.
[7] Loudon, C., Tordesillas, A. The Use of the Dimensionless Womersley Number to Characterize the Unsteady Nature of Internal Flow. Journal of Theoretical Biology 1998, 191, 63-78.