Simulation of deformation-dispersion of a blood clot using immersed boundary method

To study the dynamics of blood clot in artery, we have chosen a simplified case of deformation of an initially spherical shaped object during its motion in fluid medium. The mass diffusion from this body is also considered in this model. Forces acting on this moving body by the nearby fluid and deformation due to these applied forces are calculated here by using immersed boundary method (IBM). Spurious fluctuation of pressure and mass conservation in the intercepted cells (both fluid and solid are present) is a serious issue in IBM. To eliminate these issues we have used Marker-and-Cell Method (MAC) in the fluid cells and SOLA method in the intercepted cell for the pressure-velocity correction and these methods are repeated until a divergence free velocity field is obtained. Viscoelastic constitutive properties are considered for the blood clot. An unstructured triangular surface mesh is deployed the define the clot surface which is deformed due to the mass and momentum transport from the fluid. A loosely coupled fluid-structure interaction strategy has been used.