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Authors
Advisor(s)
Abstract(s)
Esta dissertação tem como objectivo a extracção de dados anatómicos de uma
patologia vascular humana no cérebro denominada por aneurisma cerebral, partindo de uma
imagem TC (tomografia computorizada) e a sua respectiva reconstrução de biomodelos
digitais com recurso a softwares apropriados como o Scan IP®, Inveslius®, Slicer 3D®,
Mimics® e SOLIDWORKS®. Por fim, o biomodelo resultante do SOLIDWORKS® é utilizado
para simulação do escoamento sanguíneo recorrendo ao software de dinâmica de fluidos
computacional FLUENT®.
A simulação de escoamentos sanguíneos realizada nesta dissertação foi efectuada
tendo em conta o sangue como fluido newtoniano (modelo Newtoniano) e modelos reológico
como a lei de potência e o modelo de Carreau.
A tensão de corte na parede (WSS) parece estar relacionada com o crescimento dos
aneurismas nas artérias cerebrais, sendo a pressão talvez a responsável pela ruptura dos
aneurismas. Velocidades de entrada mais elevadas, aumentam tendencialmente as
intensidades das propriedades analisadas, como a velocidade do escoamento, queda de
pressão e a WSS.
O modelo de Carreau, para certos valores de velocidade de entrada, tende a apresentar
resultados semelhantes ao de um fluido Newtoniano.
The aim of this work is an anatomical data extraction from a human vascular pathology in the brain called brain aneurysm, from a CT (computed tomography) and make is digital reconstruction by using the appropriate software such as ScanIP®, Inveslius ®, Slicer 3D®, Mimics® and SolidWorks®. Finally, the resultant biomodel from SolidWorks® is used to simulate the blood flow using the software of Computational Fluid Dynamics FLUENT®. The blood flow simulations were performed considering blood as a Newtonian fluid (Newtonian model) and descibed by non-Newtonian rheological models, namely power law and Carreau model. The wall shear stress (WSS) seems to be related to the growth of cerebral arteries aneurysms, being the pressure the maybe principal hemodynamic fact for the aneurysms rupture. Higher mean velocities, tends to increase the intensities of the analyzed properties, such as local velocity, pressure drop and WSS. The Carreau model, for certain operation conditions, tend to have similar results to Newtonian fluid.
The aim of this work is an anatomical data extraction from a human vascular pathology in the brain called brain aneurysm, from a CT (computed tomography) and make is digital reconstruction by using the appropriate software such as ScanIP®, Inveslius ®, Slicer 3D®, Mimics® and SolidWorks®. Finally, the resultant biomodel from SolidWorks® is used to simulate the blood flow using the software of Computational Fluid Dynamics FLUENT®. The blood flow simulations were performed considering blood as a Newtonian fluid (Newtonian model) and descibed by non-Newtonian rheological models, namely power law and Carreau model. The wall shear stress (WSS) seems to be related to the growth of cerebral arteries aneurysms, being the pressure the maybe principal hemodynamic fact for the aneurysms rupture. Higher mean velocities, tends to increase the intensities of the analyzed properties, such as local velocity, pressure drop and WSS. The Carreau model, for certain operation conditions, tend to have similar results to Newtonian fluid.
Description
Keywords
Aneurisma cerebral Imagiologia médica Biomodelos 3D Dinâmica de fluidos computacional Reologia do sangue Fluido Newtoniano