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- All Subjects: Mechanical Engineering
- Creators: Oswald, Jay
- Member of: Theses and Dissertations
By studying the workflow used to create the black hole, Gargantua, in Interstellar, artists can understand how to simulate complex astronomical phenomena in other special effects software such as Houdini. This workflow utilizes a balance between scientific realism and artistic interpretation of astronomical phenomena such that simulations can maximize their success in film. Through significant amounts of research and study, the artists at Double Negative generated a scientifically realistic black hole in shape and physical behavior, but made creative decisions when shading and lighting their simulation. I find that DNeg’s workflow integrates well when using Houdini technology. I follow their workflow to generate a series of spiral galaxies in Houdini and find how Houdini’s node network layout allows artists to incorporate both scientific realism and creative approaches to a simulation. A strong understanding of the mechanics of the simulated astronomical event scientifically informs the look and shape of a production, while Houdini’s node network layout makes it easy for special effects artists to manipulate simulations to their own artistic interpretation of astronomical phenomena.
In order to investigate the effects of these devices on intra-aneurysmal hemodynamics, the conventional computational fluid dynamics (CFD) approach uses the explicit geometry of the device within an aneurysm and discretizes the fluid domain to solve the Navier-Stokes equations. However, since the devices are made of small struts, the number of mesh elements in the boundary layer region would be considerable. This cumbersome task led to the implementation of the porous medium assumption. In this approach, the explicit geometry of the device is eliminated, and relevant porous medium assumptions are applied. Unfortunately, as it will be shown in this research, some of the porous medium approaches used in the literature are over-simplified. For example, considering the porous domain to be homogeneous is one major drawback which leads to significant errors in capturing the intra-aneurysmal flow features. Specifically, since the devices must comply with the complex geometry of an aneurysm, the homogeneity assumption is not valid.
In this research, a novel heterogeneous porous medium approach is introduced. This results in a substantial reduction in the total number of mesh elements required to discretize the flow domain while not sacrificing the accuracy of the method by over-simplifying the utilized assumptions.