I will do research on the model of the electromagnetic blood pump rotor on the artificial heart. due to the difference between the model of the pump rotor surrounded with liquid and that in air, I have no ieda about the details of the stiffness and damping in that condition？
If there are electric currents and magnetic fields near the bearing a magnetohydrodynamic model is needed. There a few papers in the literature on such bearings located in conducting liquid metals. Your analyses must also take into account the electrical and fluidic properties of blood that are probably well known.
Fluid will introduce velocity dependent damping forces, for calculation see http://www.lmnoeng.com/Drag/index.php. Magnetohydrodynamics need not be considered in case of blood.
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