Abstract
One-dimensional blood flow model accuracy has been verified in many studies. The topic of this work is introducing gravity into a one-dimensional model. For this purpose, gravitational force was introduced into an existing model. To account for gravity, the boundary conditions also must be adjusted to reflect the body's adaptation. For this purpose, a method for calculating the arterial resistance of the terminal arteries during gravity changes has been developed and presented in this article. The technique is based on the idea that the human body reacts to changes in gravity in such a way as to preserve the volume of blood delivered to the organs. Experiments have shown that not only the pressure, but also the flux waveform and the pressure waveform change when the flow is preserved. The method of adjusting the boundary conditions is such that the flow almost does not change after applying the gravity, but it is possible to estimate the change in pressure dynamics. This methodology can be used to study the blood flow in different cases related to gravity.
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