Computational Fluid Dynamics Research Group - Reseach

Medical Flow Modeling

• Human Caroid Arterial Bifurcation Modeling

      The bio-mechanical properties of the blood flow at carotid artery (and large arteries) are investigated. 3D geometrical models are obtained using MRI or CT data of a real patient. The formation of plague in vessels are related to mechanical properties of blood. Also the plague effects the mechanical properties of blood flow. So the effect of blood flow on diseases such as heart break and stroke are investigated. Vessel walls are moving walls according to some experimental models. So fluid structure interaction is implemented using MpCCI code coupling software. The fluid code is using finite volume method, and the structure code is using finite volume method.

a)Velocity cross-section of artery (b) Arterial pressure distribution (c) streamlines 

             Animations:   carotid artery 2 3 4 5
 

• Human Arterial Tree Network Modeling

        Hydromechanical and elasto-dinamic-hydromechanical interactions of human body blood flow in main artery are studied in detail. Flow related mathematical model simulation is realized using multi processor  cluster architecture computer environment. Using these results, Macro scaled modeling of blood flow network in human body is realized. Blood flow biomechanical properties of artery bifurcations dissecting from the main artery is studied as an initial step.

 (a) Carotid artery model         (b) Velocity vectors            (c) 13 branch model

• Human Arterial Tree Geometric Modeling

        Most CFD programs require specificly indexed geometric models in order to apply numerical solving methods. In this project, MIMICS is used to generate human arterial tree and carotid arterial bifurcation from CT & MR images. This is the previous step of 3D surface mesh and 3D solver-ready mesh structures. Preprocessing is done by tools such as MIMICS, TGRID and GAMBIT to construct 3D mesh and to achieve a more robust geometry by smoothing, refining, etc.

         Animations: arterial.mov

• Sloshing in a 3D Deformable Tank of Irregular Geometry

        Nonlinear sloshing of a viscous fluid inside a three-dimensional deformable tank of irregular geometry which is in a six-degree-of-freedom motion and under various loadings is being studied. The turbulent effects within the scope of sloshing dynamics and the effectiveness of the baffels for hydrodynamic damping are going to be investigated. The related fluid-structure interaciton (FSI) problem is going to be solved with an appropriate coupling algorithm which will handle the information exchange between CFD and CSM solutions at each time step. The commercial sofware MPCCI will be used for this purpose.

• Modeling of High Frequency Compressor Valve Interaction with Gas Flow

        The object is to build a methodology based(attacking) on Solid – fluid interaction problems using computational methods. Components such as automatic suction and exhaust valves, valves in internal combustion engine and aircraft wings are subject to deformation because of various degrees of pressure gradients. Since the deformation occurring on solid structures changes flow field because of fluid field, the problem needs to be solved as coupled and flow field needs to be solved again according to deformations on solid surfaces. Using these kind of solution with computational techniques surface out different problems depending on geometry and physics of the problem. Designing compressor valve using the methodology is studied.