Gravity influence in one-dimensional blood flow modeling

One-dimensional blood flow model accuracy has been verified in many studies. This work is about introducing gravity into a one-dimensional model. For this purpose, gravitational force was introduced into the existing model. The boundary conditions must also be adjusted to account for gravity. For this purpose, a method for calculating 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 responds to changes in gravity in such a way as to maintain the volume of blood delivered to the organs.Experiments have shown that not only the pressure changes, but also the flux and pressure waveforms change when the flow is preserved. The method of adjusting the boundary conditions is such that the flow almost does not change when gravity appears, but it is possible to estimate the change in pressure dynamics. This methodology can be used in different cases related to gravity.