Bahram Ahmadian - Division of Biomedical Engineering, Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
Bahman Vahidi - Division of Biomedical Engineering, Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

Cilia are extrusions that egress from cell body into extracellular matrix. Experiments had shown that primary cilia were flow sensors and they were deflected under fluid flow, This event caused a cascade of molecular events. The present study focuses on the basicgeometry of the cilia, which is connected to the cell surface through a thin elastic layer called spring foundation. The primary cilia is simulated with a linear elastic material and finite element method was performed along with fluid-solid interaction techniques to solve the fully coupled governing equations. Graphs of maximum stress in the primary cilia base versus spring constant ofthe thin layer for two different fillet radius show that change in fillet radius from 0.1 μm to 0.15 μm leads to a decrease in displacement of the tip cilia from 3.3 μm to 2.8 μm and an increases in stiffness of spring foundation. The obtained results show that increasing fillet radius Makes pivoting movement of the primary cilia is more difficult than initial fillet radius. So, in cilia modeling, thefilet radius should be considered and it can be used to justify pivoting movement of the primary cilia and choose reliable stiffness of spring foundation

Primary Cilium; Mechanosensation; Fluid-Structure Interaction; Cell Mechanics